[MPlayer-users] Produce 422 format pixels with mencoder for mpeg4-encoding

[James Board]

I'm trying to mpeg4-encode a file with mencoder using 2-pass encoding.  The
input file is AVI container, and has yuv422p format.  I want the output pixels
to also be yuv422p.  If I don't specify the output pixel formats, then mencoder generates
yuv420p pixels.  If I specify with 422P pixels then I get an error (see full
command and output below).  Can I mpeg4-encode files with mencoder and produce
files with some kind of 422 pixels?  What should I set 'format' to?

> mencoder IN.avi -vf eq=5:0 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=10000000:threads=1:keyint=15:format=422P:vpass=1
 -passlogfile LOGFILE -oac copy -o /dev/null

    MEncoder SVN-r36459-4.4.7 (C) 2000-2013 MPlayer Team
    success: format: 0  data: 0x0 - 0xdc49b02
    libavformat version 55.18.104 (internal)
    AVI file format detected.
    [aviheader] Video stream found, -vid 0
    AVI: No audio stream found -> no sound.
    VIDEO:  [FFVH]  1920x1080  16bpp  29.970 fps  453932.7 kbps (55411.7 kbyte/s)
    [V] filefmt:3  fourcc:0x48564646  size:1920x1080  fps:29.970  ftime:=0.0334
    libavcodec version 55.33.101 (internal)
    Opening video filter: [expand osd=1]
    Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
    Opening video filter: [eq brightness=5 contrast=0]
    ==========================================================================
    Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
    Selected video codec: [ffhuffyuv] vfm: ffmpeg (FFmpeg HuffYUV)
    ==========================================================================
    Movie-Aspect is undefined - no prescaling applied.
    videocodec: libavcodec (1920x1080 fourcc=34504d46 [FMP4])
    [mpeg4 @ 0x7fb4127a87e0]Specified pixel format yuv422p is invalid or not supported
    Could not open codec.
    FATAL: Cannot initialize video driver.
    Movie-Aspect is undefined - no prescaling applied.
    videocodec: libavcodec (1920x1080 fourcc=34504d46 [FMP4])
    [mpeg4 @ 0x7fb4127a87e0]Specified pixel format yuv422p is invalid or not supported
    Could not open codec.
    FATAL: Cannot initialize video driver.

    Exiting...