For HLS Adaptive Bitrate, add this to HLS docs

[r-t-k]

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

Originally posted by @jb-alvarado in #463 (comment)

[johnlanz]

this kind of transcoding uses ffmpeg which uses a lot of cpu. Mine consumes 200% cpu from livestream.
is there a way to make it use less cpu maybe less than 10% just like what srs did when converting to hls?

[r-t-k]

As far as I know, to resize and transcode, you need to use ffmpeg with srs. I might be missing something, but I've searched for a solution for a while, and this is the only thing that actually works. ' Make sure to maintain the markdown structure. Let me know if you find an alternative.

On Jul 9, 2020, 10:02 PM -0500, John Laniba ***@***.***>, wrote: this kind of transcoding uses ffmpeg which uses a lot of cpu. Mine consumes 200% cpu from livestream. is there a way to make it use less cpu like less than 10% just like what srs did when converting to hls? —'

Make sure to maintain the markdown structure.

You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

`TRANS_BY_GPT3`

[jb-alvarado]

is there a way to make it use less cpu maybe less than 10% just like what srs did when converting to hls?

srs is not transcoding to hls, it just copy the stream to a new container. The same would happen, when you use stream copy in ffmpeg, but as soon as you want to change the resolution you have to re-encode the stream and of course this uses more cpu power. There is no cheaper way.

[saeed-parsaee]

I had used your solution from provided gist and works fine. However when i try to transcode whole app streams it does not work as expected.
For example

            vparams {     
                crf         23;    
                x264-params keyint=50:min-keyint=25:scenecut=-1;    
                maxrate     650k;    
                bufsize     1300k;    
                refs        3;    
                c:a         copy;    
                f           flv;    
                y           rtmp://stream-low/[app]/[stream]-low;     
                c:v         copy;    
            }     
            acodec          copy;    
            oformat         flv;    
            output          rtmp://stream-high/[app]/[stream]-high;    

This does not work and The main problem is that [app]/[stream] inside vparams doesn't work and ts files not created for any of incoming streams and resolutions.

And another example

           vparams {
               ...
                y           rtmp://stream-low/live/low;
                ...
            }
            acodec          copy;
            oformat         flv;
            output          rtmp://stream-high/[app]/[stream]-high;

this will create low-[seq].ts and [stream]-high-[seq].ts
how can i have [stream]-low-[seq].ts as well?

[winlinvip]

Good job!