[FFmpeg-user] (ffmpeg 1.2.1) I cannot get 'select' to work in filter arg: -vf "select=eq(pict_type, PICT_TYPE_I)"

[John Crossman]

Two questions regarding output at bottom:

   1. What is wrong with syntax of  *-vf
   "select=eq(pict_type,PICT_TYPE_I)",   *I've tried countless variations
   (single quotes, escaped commas, no trailing comma, etc.)  No luck!
   2. Is it possible to add  *scale=-1:54 *to that same -vf  filter chain?
    If so, what is syntax?

Thank you very much.

--------------------------------

When I run:

*ffmpeg -strict unofficial -y -ss 1 -i  MatterhornRoundTrip2.mp4 -r 1
-vframes 1 -vf "select=eq(pict_type,PICT_TYPE_I)",  -deinterlace -f image2
myPicture.jpg *
*
*
I get:

ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 10 2013 15:14:14 with gcc 4.4.6 (GCC) 20120305 (Red Hat
4.4.6-4)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
--mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect
--enable-gpl --enable-version3 --enable-postproc --enable-avfilter
--enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth
--enable-frei0r --enable-libopencv --enable-libdc1394 --enable-libgsm
--enable-libmp3lame --enable-libnut --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp
--enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx
--enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g
-pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
-deinterlace is deprecated, use -filter:v yadif instead
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MatterhornRoundTrip2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf54.63.104
  Duration: 00:03:37.01, start: 0.000000, bitrate: 357 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 301 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 46 kb/s
    Metadata:
      handler_name    : SoundHandler
[Parsed_select_0 @ 0x20ca4a0] [Eval @ 0x7fffe227cc10] Missing ')' or too
many args in 'eq(pict_type'
[Parsed_select_0 @ 0x20ca4a0] Error while parsing expression 'eq(pict_type'
[AVFilterGraph @ 0x20c2600] Error initializing filter 'select' with args
'eq(pict_type'
Error opening filters!