• Compression Techniques

  FFmpeg freezes on realtime video transcoding.

  Posted by Zack Fair on September 20, 2011 at 2:03 pm

  Greetings.

  I’ve hit the problem when FFmpeg freezes when I transcode TS stream.

  Here is capture of video stream:
  https://rapidshare.com/files/2777395248/capture2.ts

  Stream #0.0[0x2c7]: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 50 tbr, 90k tbn, 50 tbc
Stream #0.1[0x2db](eng): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s


  Here is how I’m doing it:

  ffmpeg -loglevel debug -v 6 -threads 4 -i udp://@239.255.25.13:5501 -force_fps -r 25 -vcodec libx264 -f mpegts -vpre libx264-faster -vb 4000000 -s 1280×720 -an -async 1 -bufsize 134217728 -threads 4 -y “udp://@239.255.30.13:5501?pkt_size=1316&ttl=1”

  Approximately at 260 frame it freezes.

  I have tried to figure out what is the source of the problem and found that it freezes on decoding.

  ffmpeg -loglevel debug -v 6 -threads 4 -i udp://@239.255.25.13:5501 -vcodec rawvideo -f rawvideo -y /dev/null

  It also freezes but approximately on 480th frame.

  htop tells me that one core is 100% busy (Intel(R) Xeon(R) CPU E5420 @ 2.50GHz). I have tried to adjust rc_init_occupancy and rtbufsize – no effect.

  Could someone please tell me, how can I resolve this?

  P.S.

  ffmpeg version 0.8.2.git, Copyright (c) 2000-2011 the FFmpeg developers
  built on Sep 16 2011 20:39:12 with gcc 4.4.4 20100726 (Red Hat 4.4.4-13)
  configuration: –disable-ffserver –disable-ffprobe –disable-avdevice –enable-shared –enable-libx264 –enable-gpl –enable-nonfree –disable-postproc –enable-hardcoded-tables –arch=x86_64 –disable-optimizations

  Zack Fair replied 14 years, 11 months ago 1 Member · 0 Replies
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