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• ffmpeg 2nd pass segfault

  25 février 2014, par Mike Flynn

  I'm trying to get an old transcoding server up and running in a new environment and I'm experiencing some issues getting the well tested ffmpeg commands to work in the new environment.

  It's a 2 pass encoding strategy, and the first pass runs just fine every time, the 2nd pass consistently fails with the following :

  [libx264 @ 0x3925fc0] 2nd pass has more frames than 1st pass (1478)
  
  [libx264 @ 0x3925fc0] continuing anyway, at constant QP=14
  
  [libx264 @ 0x3925fc0] disabling adaptive B-frames
  
  [libx264 @ 0x3925fc0] specified frame type is not compatible with max B-frames
  
  Segmentation fault

  Here is the command we're using for each pass :

  Pass 1 :

  ffmpeg -y -i input.mp4 -pass 1 -b 774000 -ab 128000 -s 640x360 -passlogfile ffmpeglog -vcodec libx264 -g 90 -bf 3 -refs 1 -b_strategy 1 -coder 1 -qmin 10 -qmax 51 -sc_threshold 40 -flags +loop -cmp chroma -me_range 16 -me_method dia -subq 2 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -direct-pred 3 -trellis 0 -partitions -parti8x8-parti4x4-partp8x8-partb8x8 -r 30 -keyint_min 25 -wpredp 2 -rc_lookahead 50 -acodec libfaac -ar 44100 pass1.mp4

  Pass 2 :

  ffmpeg -y -i pass1.mp4 -pass 2 -b 774000 -ab 128000 -s 640x360 -passlogfile ffmpeglog -vcodec libx264 -g 90 -bf 3 -refs 8 -b_strategy 1 -coder 1 -qmin 10 -qmax 51 -sc_threshold 40 -flags +loop -cmp chroma -me_range 16 -me_method umh -subq 9 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -direct-pred 3 -trellis 2 -partitions +parti8x8+parti4x4+partp8x8+partp4x4+partb8x8 -r 30 -keyint_min 25 -wpredp 2 -rc_lookahead 60 -acodec libfaac -ar 44100 pass2.mp4

  ...and here is my ffmpeg configuration :

  ffmpeg version 2.1.4 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Feb 25 2014 19:23:21 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
  
    configuration: --enable-gpl --enable-libmp3lame --enable-libtheora --enable-libvo-aacenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-version3 --enable-libfaac --enable-nonfree
  
    libavutil      52. 48.101 / 52. 48.101
  
    libavcodec     55. 39.101 / 55. 39.101
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  Any ideas would be greatly appreciated !

• System will shutdown when running ffmpeg to convert mp4 to ogg in exec command in php

  23 avril 2014, par user270215

  I am using ffmpeg to convert my videos from mp4 to ogg,flv etc, So when i convert mp4 to ogg with the constant bitrate, sample rate and the dimensions.During when the command is running takes too much time. And after some particular(10mins) the system will shutdown and am running this in my localhost with the command . Kindly suggest any solution.

• FFmpeg - Interrupted System Call

  26 juin 2022, par Bruno Gallego

  I am trying to use FFMPEG HLS Streaming. The code works fine in console application in Linux and Windows. I also load this code (inside a library) dinamically using "dlopen" in Linux and it also works.
The problem raises when I load dinamically from Dart FFI code.
It seems like Dart runs in another thread with another Thread Context without permissions or something like this.

  


  The FFMPEG log output is :

  


  [tcp @ 0x7f00a4084f80] Starting connection attempt to 179.184.214.178 port 80
[tcp @ 0x7f00a4084f80] Connection to tcp://qthttp.apple.com.edgesuite.net:80 failed: Interrupted system call
cannot open input: -4
Interrupted system call


  


  The Code is below :

  


   AVDictionary* options = NULL;
 int err = avformat_open_input(&stream->streamContext, url, nullptr, &options);

 if (err < 0) 
 {
     std::cerr << "cannot open input: " << err << std::endl;

     char errorDescription[1024];
     av_strerror(err, errorDescription, 1024);
     std::cerr << errorDescription << std::endl;

     avformat_free_context(stream->streamContext);
 }