[Libav-user] Whats wrong with this select filter?

[amir.rouhi at rmit.edu.au]

Hi
 when i use the below command for testing the select filter, it extract all
frames and it is correct:

ffmpeg -i D:\test\1.mpg -vf "select=1 " -f image2
d:\Test\IFrames\I-Frm-%03d.jpeg

But when i uses the select filter in below format for selecting i-frames i
encountered the error as can be seen here. can you say me the reason?

D:\>ffmpeg -i D:\test\1.mpg -vf "select='eq(pict_type\,I)'"  -f image2
d:\Test\IFrames\I-Frm-%03d.jpeg
ffmpeg version N-31247-g5d4fd1d, Copyright (c) 2000-2011 the FFmpeg
developers
  built on Jul  4 2011 21:40:51 with gcc 4.6.1
  configuration: --enable-gpl --enable-version3 --enable-memalign-hack
--enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r
--e
nable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype
--enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp
--en
able-libschroedinger --enable-libspeex --enable-libtheora
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs
--enable-libxvid --enab
le-zlib
  libavutil    51. 11. 0 / 51. 11. 0
  libavcodec   53.  7. 0 / 53.  7. 0
  libavformat  53.  5. 0 / 53.  5. 0
  libavdevice  53.  2. 0 / 53.  2. 0
  libavfilter   2. 24. 3 /  2. 24. 3
  libswscale    2.  0. 0 /  2.  0. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[mpeg @ 0208BFA0] max_analyze_duration 5000000 reached at 5000000
Input #0, mpeg, from 'D:\test\1.mpg':
  Duration: 00:00:49.64, start: 0.540000, bitrate: 438 kb/s
    Stream #0.0[0x1e0]: Video: mpeg1video, yuv420p, 360x240 [PAR 1:1 DAR
3:2], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting
format 'yuvj420p'
[buffer @ 01E13FA0] w:360 h:240 pixfmt:yuv420p tb:1/1000000 sar:1/1
sws_param:
[select @ 01E5F940] [Eval @ 0022EDF8] Missing ')' or too many args in
'eq(pict_type\,I)'
[select @ 01E5F940] Error while parsing expression 'eq(pict_type\,I)'
Error initializing filter 'select' with args 'eq(pict_type\,I)'
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