[FFmpeg-trac] #1751(undetermined:new): FFmpeg keeps streaming but stream is blank/offline

FFmpeg trac at avcodec.org
Tue Sep 18 23:07:17 CEST 2012


#1751: FFmpeg keeps streaming but stream is blank/offline
-------------------------------------+-------------------------------------
             Reporter:  taqattack    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  ffmpeg       |               Blocked By:
  stream random stop                 |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Hello. I'm creator of FFsplit project (http://www.ffsplit.com). We have
 been using ffmpeg on windows to encode and stream videos to CDNs. One of
 the most annoying issues that popped up was that the stream would suddenly
 stop but ffmpeg would keep going as if nothing wrong happened. I basically
 solved this inside FFsplit by reading and detecting improper packet from
 byte arrays that are sent to it and looking for the incorrect/incomplete
 packet. But recently I was able to solve this issue inside FFmpeg source
 code. Here's what I did:

 In libavformat/rtmpproto.c, I changed:

 {{{
 if (size < 11) {
    av_log(LOG_CONTEXT, AV_LOG_DEBUG, "FLV packet too small %d\n", size);
    return 0;
 }
 }}}

 to

 {{{
 if (size < 11 && !rt->flv_off) { // <--- Added "&& !rt->flv_off"
    av_log(LOG_CONTEXT, AV_LOG_DEBUG, "FLV packet too small %d\n", size);
    return 0;
 }
 }}}

 (Source: http://broadcast.oreilly.com/2011/11/flash-media-serverffmpeg-
 annoy-1.html)

 From what I understand, the FLV packet size was bigger than RTMP and this
 solves it. Checking it inside FFsplit, the improper byte arrays dont show
 up anymore. I hope someone sees this and incorporates it inside FFmpeg.
 Thank you!

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1751>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker


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