MP3: Support mp3 for RTMP/HLS/HTTP-FLV/HTTP-TS/HLS etc.

[winlinvip]

SRS 3/4 supports MP3 over RTMP/HTTP-FLV/HTTP-TS, however there is some bugs need to be fixed.

Usage

Start SRS server:

# For RTMP/HTTP-FLV/HLS
./objs/srs -c conf/mp3.conf

# For HTTP-TS
./objs/srs -c conf/mp3.ts.conf

# For HTTP-MP3
./objs/srs -c conf/mp3.http.conf

# For RTMP(MP3) to WebRTC
./objs/srs -c conf/mp3.rtc.conf

Publish RTMP stream with mp3 audio:

ffmpeg -stream_loop -1  -re -i doc/source.flv -vcodec copy -acodec libmp3lame \
    -f flv rtmp://localhost/live/livestream

Play live stream:

• RTMP by VLC or ffplay: rtmp://localhost/live/livestream
• HTTP-FLV by VLC, ffplay or H5(srs-player): http://localhost:8080/live/livestream.flv
• HTTP-MP3 by VLC, ffplay or H5(srs-player): http://localhost:8080/live/livestream.mp3
• HTTP-TS by VLC, ffplay or H5(srs-player): http://localhost:8080/live/livestream.ts
• HLS by VLC, ffplay or H5(srs-player): http://localhost:8080/live/livestream.m3u8
• Covert RTMP(MP3) to WebRTC, play by H5(srs-player): webrtc://localhost/live/livestream

Status

I tested the ability for MP3 over serval protocols, found that some is ok but others fail, and listed the test result bellow.

• Push RTMP stream with mp3 audio. SRS 4.0+
• Play RTMP stream with mp3 audio by VLC/ffplay. SRS 4.0+
• Play HTTP-FLV stream with mp3 audio by VLC/ffplay/H5(srs-player). SRS 4.0+
• Play HTTP-MP3 stream with mp3 audio by VLC/ffplay/H5(srs-player). SRS 4.0+
• Play HTTP-TS stream with mp3 audio by VLC/ffplay/H5(srs-player). SRS 4.0.269+ #3334
• Play HLS stream with mp3 audio by VLC/ffplay/H5(srs-player). SRS 4.0.269+ #3337
• H5(srs-player) support play HTTP-MP3 stream. SRS 6.0.7+ #3338
• Show audio stream information about the codec and channels, etc. SRS 5.0.117+ #3339
• Convert RTMP(MP3) to WebRTC(OPUS). SRS 5.0.118+ #3340
• DVR live stream to FLV file with MP3 audio. SRS4.0+
• DVR live stream to MP4 file with MP3 audio. SRS4.0+
• HTTP-TS: Support mp3 audio codec. xqq/mpegts.js#83
• Regresstion test for mp3 audio. SRS 5.0+ Test: Add blackbox for MP3 audio codec. #3358
• Play MPEG-DASH with MP3 audio. No plan.

Note: There is a bug for playing HTTP-TS with mp3 audio by H5, see mpegts.js #83

[winlinvip]

RTMP and FLV are capable of supporting MP3. HLS can also support it, but it may not be certain if it supports it well, refer to #301.

Known issue: For pure audio MP3 streams, there may be a significant delay problem. It requires a large amount of data to start playing, so SRS has implemented a cache that provides a bunch of data.

TRANS_BY_GPT3

[radiorz]

srs How to support mp3? Can I receive it like this?

ffmpeg.exe -re -stream_loop -1 -i ${filePath} -c copy -f flv 
 rtmp://${domain}/live/test

However, change it to...

ffmpeg.exe -re -stream_loop -1 -i ${filePath} -c copy -f mp3
 rtmp://${domain}/live/test

Then it can't be received anymore.

TRANS_BY_GPT3