Hackathon (#113)
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# Hackathon
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IETF Prague 118
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## MoqTransport
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Reference libraries are available at [moq-rs](https://github.com/kixelated/moq-rs) and [moq-js](https://github.com/kixelated/moq-js). The Rust library is [well documented](https://docs.rs/moq-transport/latest/moq_transport/) but the web library, not so much.
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**TODO** Update both to draft-01.
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**TODO** Switch any remaining forks over to extensions. ex: track_id in SUBSCRIBE
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The stream mapping right now is quite rigid: `stream == group == object`.
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**TODO** Support multiple objects per group. They MUST NOT use different priorities, different tracks, or out-of-order sequences.
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The API and cache aren't designed to send/receive arbitrary objects over arbitrary streams as specified in the draft. I don't think it should, and it wouldn't be possible to implement in time for the hackathon anyway.
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**TODO** Make an extension to require this stream mapping?
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## Generic Relay
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I'm hosting a simple CDN at: `relay.quic.video`
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The traffic is sharded based on the WebTransport path to avoid namespace collisions. Think of it like a customer ID, although it's completely unauthenticated for now. Use your username or whatever string you want: `CONNECT https://relay.quic.video/alan`.
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**TODO** Currently, it performs an implicit `ANNOUNCE ""` when `role=publisher`. This means there can only be a single publisher per shard and `role=both` is not supported. I should have explicit `ANNOUNCE` messages supported before the hackathon to remove this limitation.
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**TODO** I don't know if I will have subscribe hints fully working in time. They will be parsed but might be ignored.
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## CMAF Media
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You can [publish](https://quic.video/publish) and [watch](https://quic.video/watch) broadcasts.
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You can also use `moq-pub` to publish your own media if you would like.
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I'm currently using a JSON catalog similar to the proposed [Warp catalog](https://datatracker.ietf.org/doc/draft-wilaw-moq-catalogformat/).
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**TODO** update to the proposed format.
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If you want to fetch from the relay directly, the name of the broadcast is path. For example, `https://quic.video/watch/bbb` can be accessed at `relay.quic.video/bbb`. The namespace is empty and the catalog track is `.catalog`.
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Each of the tracks uses a single object per groups. Video groups are per GoP, while audio groups are per frame. There's also an init track containing information required to initialize the decoder.
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**TODO** Base64 encode the init track in the catalog.
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**TODO** Add a flag for publishing LoC media? It shouldn't be difficult.
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## Clock
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**TODO** Host a clock demo that sends a group per second:
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```
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GROUP: YYYY-MM-DD HH:MM
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OBJECT: SS
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```
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@ -83,9 +83,16 @@ The following command runs a development instance, broadcasing `dev/source.mp4`
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```
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It will print out a URL when you can use to watch.
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This will contain a random broadcast name so the below link won't work:
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By default, the broadcast name is `dev` but you can overwrite it with the `NAME` env.
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> Watch URL: https://quic.video/watch/REPLACE_WITH_NAME?server=localhost:4443
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> Watch URL: https://quic.video/watch/dev?server=localhost:4443
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If you're debugging encoding issues, you can use this script to dump the file to disk instead, defaulting to
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`dev/output.mp4`.
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```bash
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./dev/pub-file
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```
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### moq-api
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17
dev/pub
17
dev/pub
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@ -13,21 +13,28 @@ PORT="${PORT:-4443}"
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ADDR="${ADDR:-$HOST:$PORT}"
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# Generate a random 16 character name by default.
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NAME="${NAME:-$(head /dev/urandom | LC_ALL=C tr -dc 'a-zA-Z0-9' | head -c 16)}"
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#NAME="${NAME:-$(head /dev/urandom | LC_ALL=C tr -dc 'a-zA-Z0-9' | head -c 16)}"
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# JK use the name "dev" instead
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# TODO use that random name if the host is not localhost
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NAME="${NAME:-dev}"
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# Combine the host and name into a URL.
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URL="${URL:-"https://$ADDR/$NAME"}"
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# Default to a source video
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MEDIA="${MEDIA:-dev/source.mp4}"
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INPUT="${INPUT:-dev/source.mp4}"
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# Print out the watch URL
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echo "Watch URL: https://quic.video/watch/$NAME?server=$ADDR"
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# Run ffmpeg and pipe the output to moq-pub
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# TODO enable audio again once fixed.
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ffmpeg -hide_banner -v quiet \
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-stream_loop -1 -re \
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-i "$MEDIA" \
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-i "$INPUT" \
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-c copy \
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-an \
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-f mp4 -movflags empty_moov+frag_every_frame+separate_moof+omit_tfhd_offset - \
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| cargo run --bin moq-pub -- "$URL" "$@"
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-f mp4 -movflags cmaf+separate_moof+delay_moov+skip_trailer \
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-frag_duration 1 \
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- | cargo run --bin moq-pub -- "$URL" "$@"
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#!/bin/bash
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set -euo pipefail
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# Change directory to the root of the project
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cd "$(dirname "$0")/.."
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# Default to a source video
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INPUT="${INPUT:-dev/source.mp4}"
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# Output the fragmented MP4 to disk for testing.
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OUTPUT="${OUTPUT:-dev/output.mp4}"
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# Run ffmpeg the same as dev/pub, but:
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# - print any errors/warnings
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# - only loop twice
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#
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# Note this is artificially slowed down to real-time using the -re flag; you can remove it.
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ffmpeg \
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-re \
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-y \
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-i "$INPUT" \
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-c copy \
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-fps_mode passthrough \
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-f mp4 -movflags cmaf+separate_moof+delay_moov+skip_trailer \
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-frag_duration 1 \
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"${OUTPUT}"
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# % ffmpeg -f mp4 --ffmpeg -h muxer=mov
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#
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# ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
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# Muxer mov [QuickTime / MOV]:
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# Common extensions: mov.
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# Default video codec: h264.
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# Default audio codec: aac.
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# mov/mp4/tgp/psp/tg2/ipod/ismv/f4v muxer AVOptions:
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# -movflags <flags> E.......... MOV muxer flags (default 0)
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# rtphint E.......... Add RTP hint tracks
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# empty_moov E.......... Make the initial moov atom empty
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# frag_keyframe E.......... Fragment at video keyframes
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# frag_every_frame E.......... Fragment at every frame
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# separate_moof E.......... Write separate moof/mdat atoms for each track
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# frag_custom E.......... Flush fragments on caller requests
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# isml E.......... Create a live smooth streaming feed (for pushing to a publishing point)
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# faststart E.......... Run a second pass to put the index (moov atom) at the beginning of the file
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# omit_tfhd_offset E.......... Omit the base data offset in tfhd atoms
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# disable_chpl E.......... Disable Nero chapter atom
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# default_base_moof E.......... Set the default-base-is-moof flag in tfhd atoms
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# dash E.......... Write DASH compatible fragmented MP4
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# cmaf E.......... Write CMAF compatible fragmented MP4
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# frag_discont E.......... Signal that the next fragment is discontinuous from earlier ones
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# delay_moov E.......... Delay writing the initial moov until the first fragment is cut, or until the first fragment flush
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# global_sidx E.......... Write a global sidx index at the start of the file
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# skip_sidx E.......... Skip writing of sidx atom
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# write_colr E.......... Write colr atom even if the color info is unspecified (Experimental, may be renamed or changed, do not use from scripts)
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# prefer_icc E.......... If writing colr atom prioritise usage of ICC profile if it exists in stream packet side data
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# write_gama E.......... Write deprecated gama atom
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# use_metadata_tags E.......... Use mdta atom for metadata.
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# skip_trailer E.......... Skip writing the mfra/tfra/mfro trailer for fragmented files
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# negative_cts_offsets E.......... Use negative CTS offsets (reducing the need for edit lists)
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# -moov_size <int> E.......... maximum moov size so it can be placed at the begin (from 0 to INT_MAX) (default 0)
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# -rtpflags <flags> E.......... RTP muxer flags (default 0)
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# latm E.......... Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC
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# rfc2190 E.......... Use RFC 2190 packetization instead of RFC 4629 for H.263
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# skip_rtcp E.......... Don't send RTCP sender reports
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# h264_mode0 E.......... Use mode 0 for H.264 in RTP
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# send_bye E.......... Send RTCP BYE packets when finishing
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# -skip_iods <boolean> E.......... Skip writing iods atom. (default true)
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# -iods_audio_profile <int> E.......... iods audio profile atom. (from -1 to 255) (default -1)
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# -iods_video_profile <int> E.......... iods video profile atom. (from -1 to 255) (default -1)
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# -frag_duration <int> E.......... Maximum fragment duration (from 0 to INT_MAX) (default 0)
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# -min_frag_duration <int> E.......... Minimum fragment duration (from 0 to INT_MAX) (default 0)
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# -frag_size <int> E.......... Maximum fragment size (from 0 to INT_MAX) (default 0)
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# -ism_lookahead <int> E.......... Number of lookahead entries for ISM files (from 0 to 255) (default 0)
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# -video_track_timescale <int> E.......... set timescale of all video tracks (from 0 to INT_MAX) (default 0)
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# -brand <string> E.......... Override major brand
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# -use_editlist <boolean> E.......... use edit list (default auto)
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# -fragment_index <int> E.......... Fragment number of the next fragment (from 1 to INT_MAX) (default 1)
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# -mov_gamma <float> E.......... gamma value for gama atom (from 0 to 10) (default 0)
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# -frag_interleave <int> E.......... Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) (from 0 to INT_MAX) (default 0)
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# -encryption_scheme <string> E.......... Configures the encryption scheme, allowed values are none, cenc-aes-ctr
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# -encryption_key <binary> E.......... The media encryption key (hex)
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# -encryption_kid <binary> E.......... The media encryption key identifier (hex)
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# -use_stream_ids_as_track_ids <boolean> E.......... use stream ids as track ids (default false)
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# -write_btrt <boolean> E.......... force or disable writing btrt (default auto)
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# -write_tmcd <boolean> E.......... force or disable writing tmcd (default auto)
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# -write_prft <int> E.......... Write producer reference time box with specified time source (from 0 to 2) (default 0)
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# wallclock 1 E..........
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# pts 2 E..........
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# -empty_hdlr_name <boolean> E.......... write zero-length name string in hdlr atoms within mdia and minf atoms (default false)
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# -movie_timescale <int> E.......... set movie timescale (from 1 to INT_MAX) (default 1000)
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@ -5,7 +5,7 @@ A command line tool for publishing media via Media over QUIC (MoQ).
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Expects to receive fragmented MP4 via standard input and connect to a MOQT relay.
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```
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ffmpeg ... - | moq-pub -i - --host localhost:4443
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ffmpeg ... - | moq-pub https://localhost:4443
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```
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### Invoking `moq-pub`:
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@ -13,7 +13,7 @@ ffmpeg ... - | moq-pub -i - --host localhost:4443
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Here's how I'm currently testing things, with a local copy of Big Buck Bunny named `bbb_source.mp4`:
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```
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$ ffmpeg -hide_banner -v quiet -stream_loop -1 -re -i bbb_source.mp4 -an -f mp4 -movflags empty_moov+frag_every_frame+separate_moof+omit_tfhd_offset - | RUST_LOG=moq_pub=info moq-pub -i -
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$ ffmpeg -hide_banner -v quiet -stream_loop -1 -re -i bbb_source.mp4 -an -f mp4 -movflags empty_moov+frag_every_frame+separate_moof+omit_tfhd_offset - | RUST_LOG=moq_pub=info moq-pub https://localhost:4443
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```
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This relies on having `moq-relay` (the relay server) already running locally in another shell.
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@ -4,6 +4,7 @@ use moq_transport::cache::{broadcast, segment, track};
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use moq_transport::VarInt;
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use mp4::{self, ReadBox};
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use serde_json::json;
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use std::cmp::max;
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use std::collections::HashMap;
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use std::io::Cursor;
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use std::time;
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@ -15,11 +16,12 @@ pub struct Media {
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_catalog: track::Publisher,
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_init: track::Publisher,
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tracks: HashMap<String, Track>,
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// Tracks based on their track ID.
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tracks: HashMap<u32, Track>,
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}
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impl Media {
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pub async fn new(config: &Config, mut broadcast: broadcast::Publisher) -> anyhow::Result<Self> {
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pub async fn new(_config: &Config, mut broadcast: broadcast::Publisher) -> anyhow::Result<Self> {
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let mut stdin = tokio::io::stdin();
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let ftyp = read_atom(&mut stdin).await?;
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anyhow::ensure!(&ftyp[4..8] == b"ftyp", "expected ftyp atom");
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@ -39,7 +41,7 @@ impl Media {
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let moov = mp4::MoovBox::read_box(&mut moov_reader, moov_header.size)?;
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// Create the catalog track with a single segment.
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let mut init_track = broadcast.create_track("1.mp4")?;
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let mut init_track = broadcast.create_track("0.mp4")?;
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let mut init_segment = init_track.create_segment(segment::Info {
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sequence: VarInt::ZERO,
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priority: i32::MAX,
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@ -52,20 +54,20 @@ impl Media {
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for trak in &moov.traks {
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let id = trak.tkhd.track_id;
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let name = id.to_string();
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let name = format!("{}.m4s", id);
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let timescale = track_timescale(&moov, id);
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// Store the track publisher in a map so we can update it later.
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let track = broadcast.create_track(&name)?;
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let track = Track::new(track, timescale);
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tracks.insert(name, track);
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tracks.insert(id, track);
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}
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let mut catalog = broadcast.create_track(".catalog")?;
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// Create the catalog track
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Self::serve_catalog(&mut catalog, config, init_track.name.to_string(), &moov, &tracks)?;
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Self::serve_catalog(&mut catalog, &init_track.name, &moov)?;
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Ok(Media {
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_broadcast: broadcast,
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@ -78,7 +80,7 @@ impl Media {
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pub async fn run(&mut self) -> anyhow::Result<()> {
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let mut stdin = tokio::io::stdin();
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// The current track name
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let mut track_name = None;
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let mut current = None;
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loop {
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let atom = read_atom(&mut stdin).await?;
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@ -92,22 +94,21 @@ impl Media {
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// Process the moof.
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let fragment = Fragment::new(moof)?;
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let name = fragment.track.to_string();
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// Get the track for this moof.
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let track = self.tracks.get_mut(&name).context("failed to find track")?;
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let track = self.tracks.get_mut(&fragment.track).context("failed to find track")?;
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// Save the track ID for the next iteration, which must be a mdat.
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anyhow::ensure!(track_name.is_none(), "multiple moof atoms");
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track_name.replace(name);
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anyhow::ensure!(current.is_none(), "multiple moof atoms");
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current.replace(fragment.track);
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// Publish the moof header, creating a new segment if it's a keyframe.
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track.header(atom, fragment).context("failed to publish moof")?;
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}
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mp4::BoxType::MdatBox => {
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// Get the track ID from the previous moof.
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let name = track_name.take().context("missing moof")?;
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let track = self.tracks.get_mut(&name).context("failed to find track")?;
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let track = current.take().context("missing moof")?;
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let track = self.tracks.get_mut(&track).context("failed to find track")?;
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// Publish the mdat atom.
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track.data(atom).context("failed to publish mdat")?;
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fn serve_catalog(
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track: &mut track::Publisher,
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config: &Config,
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init_track_name: String,
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init_track_name: &str,
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moov: &mp4::MoovBox,
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_tracks: &HashMap<String, Track>,
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) -> Result<(), anyhow::Error> {
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let mut segment = track.create_segment(segment::Info {
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sequence: VarInt::ZERO,
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@ -133,47 +132,82 @@ impl Media {
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expires: None,
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})?;
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// avc1[.PPCCLL]
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//
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// let profile = 0x64;
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// let constraints = 0x00;
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// let level = 0x1f;
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let mut tracks = Vec::new();
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// TODO: do build multi-track catalog by looping through moov.traks
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let trak = moov.traks[0].clone();
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let avc1 = trak
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.mdia
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.minf
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.stbl
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.stsd
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.avc1
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.ok_or(anyhow::anyhow!("avc1 atom not found"))?;
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for trak in &moov.traks {
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let mut track = json!({
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"container": "mp4",
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"init_track": init_track_name,
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"data_track": format!("{}.m4s", trak.tkhd.track_id),
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});
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let profile = avc1.avcc.avc_profile_indication;
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let constraints = avc1.avcc.profile_compatibility; // Not 100% certain here, but it's 0x00 on my current test video
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let level = avc1.avcc.avc_level_indication;
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let stsd = &trak.mdia.minf.stbl.stsd;
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if let Some(avc1) = &stsd.avc1 {
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// avc1[.PPCCLL]
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//
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// let profile = 0x64;
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// let constraints = 0x00;
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// let level = 0x1f;
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let profile = avc1.avcc.avc_profile_indication;
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let constraints = avc1.avcc.profile_compatibility; // Not 100% certain here, but it's 0x00 on my current test video
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let level = avc1.avcc.avc_level_indication;
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let width = avc1.width;
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let height = avc1.height;
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let width = avc1.width;
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let height = avc1.height;
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let codec = rfc6381_codec::Codec::avc1(profile, constraints, level);
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let codec_str = codec.to_string();
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let codec = rfc6381_codec::Codec::avc1(profile, constraints, level);
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let codec_str = codec.to_string();
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track["kind"] = json!("video");
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track["codec"] = json!(codec_str);
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track["width"] = json!(width);
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track["height"] = json!(height);
|
||||
} else if let Some(_hev1) = &stsd.hev1 {
|
||||
// TODO https://github.com/gpac/mp4box.js/blob/325741b592d910297bf609bc7c400fc76101077b/src/box-codecs.js#L106
|
||||
anyhow::bail!("HEVC not yet supported")
|
||||
} else if let Some(mp4a) = &stsd.mp4a {
|
||||
let desc = &mp4a
|
||||
.esds
|
||||
.as_ref()
|
||||
.context("missing esds box for MP4a")?
|
||||
.es_desc
|
||||
.dec_config;
|
||||
let codec_str = format!("mp4a.{:02x}.{}", desc.object_type_indication, desc.dec_specific.profile);
|
||||
|
||||
track["kind"] = json!("audio");
|
||||
track["codec"] = json!(codec_str);
|
||||
track["channel_count"] = json!(mp4a.channelcount);
|
||||
track["sample_rate"] = json!(mp4a.samplerate.value());
|
||||
track["sample_size"] = json!(mp4a.samplesize);
|
||||
|
||||
let bitrate = max(desc.max_bitrate, desc.avg_bitrate);
|
||||
if bitrate > 0 {
|
||||
track["bit_rate"] = json!(bitrate);
|
||||
}
|
||||
} else if let Some(vp09) = &stsd.vp09 {
|
||||
// https://github.com/gpac/mp4box.js/blob/325741b592d910297bf609bc7c400fc76101077b/src/box-codecs.js#L238
|
||||
let vpcc = &vp09.vpcc;
|
||||
let codec_str = format!("vp09.0.{:02x}.{:02x}.{:02x}", vpcc.profile, vpcc.level, vpcc.bit_depth);
|
||||
|
||||
track["kind"] = json!("video");
|
||||
track["codec"] = json!(codec_str);
|
||||
track["width"] = json!(vp09.width); // no idea if this needs to be multiplied
|
||||
track["height"] = json!(vp09.height); // no idea if this needs to be multiplied
|
||||
|
||||
// TODO Test if this actually works; I'm just guessing based on mp4box.js
|
||||
anyhow::bail!("VP9 not yet supported")
|
||||
} else {
|
||||
// TODO add av01 support: https://github.com/gpac/mp4box.js/blob/325741b592d910297bf609bc7c400fc76101077b/src/box-codecs.js#L251
|
||||
anyhow::bail!("unknown codec for track: {}", trak.tkhd.track_id);
|
||||
}
|
||||
|
||||
tracks.push(track);
|
||||
}
|
||||
|
||||
let catalog = json!({
|
||||
"tracks": [
|
||||
{
|
||||
"container": "mp4",
|
||||
"kind": "video",
|
||||
"init_track": init_track_name,
|
||||
"data_track": "1", // assume just one track for now
|
||||
"codec": codec_str,
|
||||
"width": width,
|
||||
"height": height,
|
||||
"frame_rate": config.fps,
|
||||
"bit_rate": config.bitrate,
|
||||
}
|
||||
]
|
||||
"tracks": tracks
|
||||
});
|
||||
|
||||
let catalog_str = serde_json::to_string_pretty(&catalog)?;
|
||||
log::info!("catalog: {}", catalog_str);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue