Christian Ebert <[email protected]> added the comment:

Errmh, but a movie is for displaying, isn't it ;-) With mplayer I can force
-aspect 16/9, but my final goal is encoding to h264 for the web where I can't
force the aspect.

Without aspect mplayer gives:

MPlayer SVN-r32643-4.0.1 (C) 2000-2010 MPlayer Team

Playing test.mp4.
libavformat file format detected.
[lavf] stream 0: video (mpeg4), -vid 0
[lavf] stream 1: audio (aac), -aid 0, -alang und
VIDEO:  [MP4V]  640x360  24bpp  25.000 fps  514.0 kbps (62.7 kbyte/s)
Clip info:
 major_brand: isom
 minor_version: 512
 compatible_brands: isomiso2mp41
 creation_time: 1970-01-01 00:00:00
 encoder: Lavf52.86.1
Opening video filter: [ass auto=1]
Opening video filter: [scale]
[ass] auto-open
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 126.8 kbit/8.25% (ratio: 15847->192000)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
AO: [coreaudio] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
Movie-Aspect is 1.89:1 - prescaling to correct movie aspect.
[swscaler @ 0x8e88c0]BICUBIC scaler, from yuv420p to yuyv422 using MMX2
VO: [corevideo] 640x360 => 682x360 Packed YUY2


i.e. there is a distortion which I would very much like to avoid. Some actors do
not like to look like frogs ;-)

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<https://roundup.ffmpeg.org/issue2378>
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