2-pass log file for ffv1 too large

[Carl Eugen Hoyos]

​http://thread.gmane.org/gmane.comp.video.ffmpeg.user/48560
Using 2-pass ffv1 encoding leads to very large log files, for movie-length samples, the log file is too large to be read:

$ ffmpeg -f lavfi -i testsrc -pass 1 -vcodec ffv1 -t 3600 -f null -

$ ffmpeg -f lavfi -i testsrc -pass 2 -vcodec ffv1 out.avi
ffmpeg version N-57390-g210afae Copyright (c) 2000-2013 the FFmpeg developers
  built on Oct 24 2013 13:18:47 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --cpu=corei7-avx
  libavutil      52. 47.101 / 52. 47.101
  libavcodec     55. 38.101 / 55. 38.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 89.100 /  3. 89.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, lavfi, from 'testsrc':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[swscaler @ 0x1bc6f80] deprecated pixel format used, make sure you did set range correctly
Could not allocate file buffer
Error reading log file 'ffmpeg2pass-0.log' for pass-2 encoding

Work-around is to use -max_alloc but this fails for longer samples:

$ ls -l ffmpeg2pass-0.log
-rw-r--r-- 1 cehoyos users 2965860816 Oct 24 13:39 ffmpeg2pass-0.log
$ ffmpeg -max_alloc 3000000000 -f lavfi -i testsrc -pass 2 -vcodec ffv1 out.avi

[Michael Niedermayer]

Fixed in 1fb3b494fac70a51f48e94b5ae2d9f715b5d14e7