ossrs/srs

Migrate from NGINX-RTMP, support HLS variant, multiple bitrate, HLS multi-bitrate

winlinvip opened this issue · 6 comments

winlinvip commented

https://github.com/arut/nginx-rtmp-module/wiki/Directives#hls_variant
NGINX-RTMP matches several stream names and then generates a single HLS multi-bitrate stream.

TRANS_BY_GPT3

mbeacom commented

@winlinvip Is this something you're looking for contributions on or do you plan to write this yourself? Thanks for everything!

winlinvip commented

Both are ok.

jpransxdev commented

This would be crazy useful. I stumbled upon SRS and was very excited but with no support for HLS variants SRS does not fit my use case :) Unfortunately am unable to contribute to this :(

winlinvip commented

Plan in SRS4.

jb-alvarado commented

For people how needs this feature: you can realize this now already with srs:

  • prepare your defaultVhost with transcoding:
transcode live/stream {
        enabled     on;
        ffmpeg      /usr/local/bin/ffmpeg;
        engine half {
            enabled         on;
            iformat         live_flv;
            vfilter {
                v           quiet;
            }

            vcodec          libx264;
            vfps            25;
            vwidth          512;
            vheight         288;
            vprofile        main;
            vpreset         medium;

            vparams {
                crf         23;
                x264opts    keyint=50:min-keyint=50:no-scenecut;
                maxrate     650k;
                bufsize     1300k;
            }

            acodec          copy;
            oformat         flv;
            output          rtmp://localhost:1935/live/half;
        }
    }

    hls {
        enabled         on;
        hls_path        /var/www/srs/live;
        hls_fragment    6;
        hls_window      1800;
        hls_cleanup     on;
        hls_dispose     5;
        hls_m3u8_file   [stream]_hq.m3u8;
        hls_ts_file     [stream]_hq-[seq].ts;
    }
  • then add a second vhost for localhost and add there a new hls statement:
    hls {
        enabled         on;
        hls_path        /var/www/srs/live;
        hls_fragment    6;
        hls_window      1800;
        hls_cleanup     on;
        hls_dispose     5;
        hls_m3u8_file   [stream]_lq.m3u8;
        hls_ts_file     [stream]_lq-[seq].ts;
    }
  • then create a master.m3u8:
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:YES
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-TARGETDURATION:15
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2149280,CODECS="mp4a.40.2,avc1.64001f",RESOLUTION=1024x576,NAME="1024"
live/stream_hq.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=460560,CODECS="mp4a.40.5,avc1.420016",RESOLUTION=512x288,NAME="512"
live/half_lq.m3u8
  • set the correct BANDWIDTH

If you need more resolutions just add in transcode more outputs under vparams, maybe like this:

...
s           1024x576;
crf         23;
x264opts    keyint=50:min-keyint=50:no-scenecut;
maxrate     1300k;
bufsize     2600k;
f           flv;
c:a         copy;
y           rtmp://127.0.1.1:1935/live/big;
crf         23;
x264opts    keyint=50:min-keyint=50:no-scenecut;
maxrate     650k;
bufsize     1300k;
...

and add more vhosts.

Here is a working gist

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  • ❤️6
winlinvip commented

@jb-alvarado 👍 Thanks! It's a better solution to use FFMPEG to transcode RTMP to multiple HLS streams.

  • 👍1