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

[Clément Bœsch]

On Tue, Feb 14, 2012 at 05:44:05PM +1100, amir.rouhi at rmit.edu.au wrote:
> 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)'

Try removing the simple quotes: -vf "select=eq(pict_type\,I)"

BTW, this is likely a ffmpeg-user question.

-- 
Clément B.
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