Ingest no audio stream (HLS trouble) #409

icevl · 2015-05-27T23:55:34Z

Hi. I use SRS 2.
When i catch my camera stream with no audio, on output from ingest i getting stream with audo "undf" codec and results HLS on mobile platforms doesnt work.

ffmoeg info HLS .ts file:
[NULL @ 0x237f1e0] start time for stream 0 is not set in estimate_timings_from_pts
[mpegts @ 0x237b420] Could not find codec parameters for stream 0 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options

Example of hls stream: http://cam.utl.ru/22/hls/live.m3u8

winlinvip · 2015-05-28T01:15:52Z

HLS does not support video only.

winlinvip · 2015-05-28T05:11:28Z

Maybe SRS should support this.

winlinvip · 2015-05-29T13:23:54Z

Use SRS ingest to drop audio and output HLS:

vhost __defaultVhost__ {
    hls {
        enabled         on;
        hls_fragment    10;
        hls_window      60;
        hls_path        ./objs/nginx/html;
        hls_m3u8_file   [app]/[stream]/live.m3u8;
        hls_ts_file     [app]/[stream]/[timestamp].ts;
    }
    ingest livestream {
        enabled      on;
        input {
            type    file;
            url     doc/source.200kbps.768x320.flv;
        }
        ffmpeg      ./objs/ffmpeg/bin/ffmpeg;
        engine {
            enabled    on;
            vcodec copy;
            acodec an;
            output          rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;
        }
    }
}

Get the info of HLS:

winlin:livestream winlin$ ffmpeg -i live.m3u8 
    Stream #0:0: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Stream #0:1: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 768x320 [SAR 1:1 DAR 12:5], 25 fps, 25 tbr, 90k tbn, 50 tbc

There is no audio stream, but the HLS indicates the audio codec is AAC.

winlinvip · 2015-05-29T13:52:54Z

This because the SRS never know the codec of video and audio when write the ts PAT/PMT info.
So we must set the vcodec and acodec of HLS:

        # the default audio codec of hls.
        # when codec changed, write the PAT/PMT table, but maybe ok util next ts.
        # so user can set the default codec for mp3.
        # the available audio codec:
        #       aac, mp3, an
        # default: aac
        hls_acodec      an;
        # the default video codec of hls.
        # when codec changed, write the PAT/PMT table, but maybe ok util next ts.
        # so user can set the default codec for pure audio(without video) to vn.
        # the available video codec:
        #       h264, vn
        # default: h264
        hls_vcodec      h264;

So, we change the config of SRS to:

vhost __defaultVhost__ {
    hls {
        enabled         on;
        hls_fragment    10;
        hls_window      60;
        hls_path        ./objs/nginx/html;
        hls_m3u8_file   [app]/[stream]/live.m3u8;
        hls_ts_file     [app]/[stream]/[timestamp].ts;
        hls_acodec      an;
        hls_vcodec      h264;
    }
    ingest livestream {
        enabled      on;
        input {
            type    file;
            url     doc/source.200kbps.768x320.flv;
        }
        ffmpeg      ./objs/ffmpeg/bin/ffmpeg;
        engine {
            enabled    on;
            vcodec copy;
            acodec an;
            output          rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;
        }
    }
}

And the info of SRS:

winlin:srs winlin$ ./objs/srs -v
2.0.172
winlin:livestream winlin$ ffmpeg -i live.m3u8 
    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 768x320 [SAR 1:1 DAR 12:5], 25 fps, 25 tbr, 90k tbn, 50 tbc

And it's test ok on:

MAC safari.
MAC chrome, jwplayer.
MAC VLC.
Android 4.4

winlinvip closed this as completed May 28, 2015

winlinvip added question labels May 28, 2015

winlinvip added this to the srs 2.0 release milestone May 28, 2015

winlinvip reopened this May 28, 2015

winlinvip closed this as completed May 29, 2015

winlinvip added a commit that referenced this issue May 29, 2015

fix #409: support pure video hls. 2.0.172.

5caafad

winlinvip self-assigned this Aug 26, 2021

winlinvip added the EnglishNative This issue is conveyed exclusively in English. label Jul 28, 2023

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Ingest no audio stream (HLS trouble) #409

Ingest no audio stream (HLS trouble) #409

Ingest no audio stream (HLS trouble) #409

Ingest no audio stream (HLS trouble) #409

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