[MEncoder-users] mencoder size and aspect ratios for H.264 video

[Etienne Buira]

On Sat, Oct 03, 2009 at 05:45:00PM -0400, John Ratliff wrote:
> I'm using mencoder to convert a DVD to a matroska file with H.264 video
> and Vorbis audio. But when I play the file, the aspect ratio is 2.43:1,
> when it should be 16:9.
> 
> mkvmerge tells me it extracted the aspect ratio from the AVC video data
> as 2.43:1.
> "'video.x264' track 0: Extracted the aspect ratio information from the
> MPEG-4 layer 10 (AVC) video data and set the display dimensions to 854/352."
> 
> mplayer tells me the aspect ratio is 16:9 on the original source DVD.
> "Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> VO: [xv] 720x480 => 854x480 Planar YV12"
> 
> I would like to resize the video to 640x360 (or maybe 624x352 - some
> articles tell me both dimensions must be multiples of 16 - wasn't sure
> if that was correct). I am using MPlayer SVN-r29463-4.3.2 and mkvtoolnix
> 2.98 on 64-bit Linux.
> 
> Here are the commands I used:
> 
> # dump the movie
> mplayer -dvd-device movie.iso dvd://1 -dumpstream -dumpfile
> /tmp/dvd-encode/movie.vob
> 
> # first video encoder pass
> mencoder /tmp/dvd-encode/movie.vob -oac copy -vf
> pullup,softskip,crop=720:352:0:62,scale=640:360,harddup
> -force-avi-aspect 16:9 -ovc x264 -ofps 24000/1001 -x264encopts
> pass=1:threads=auto:bitrate=${VBITRATE}:subq=6:8x8dct:frameref=5:bframes=3:b_pyramid:weight_b:turbo=1
> -o /dev/null
> 
> # second video encoder pass
> mencoder /tmp/dvd-encode/movie.vob -oac copy -vf
> pullup,softskip,crop=720:352:0:62,scale=640:360,harddup
> -force-avi-aspect 16:9 -ovc x264 -ofps 24000/1001 -x264encopts
> pass=2:threads=auto:bitrate=${VBITRATE}:subq=6:8x8dct:frameref=5:bframes=3:b_pyramid:weight_b:turbo=1
> -o /tmp/dvd-encode/video.x264
> 
> # mux matroska container
> mkvmerge -A video.x264 audio.ogg -o movie.mkv
> 
> 
> 
> mplayer movie.mkv tells me:
> "Movie-Aspect is 2.43:1 - prescaling to correct movie aspect.
> VO: [xv] 624x352 => 854x352 Planar YV12"
> 
> mplayer video.x264 tells me:
> "Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> VO: [xv] 624x352 => 626x352 Planar YV12"
> 
> 
> Thanks,

So, I assume the question is you want to know how to make a mkv with all
informations in it to play with correct AR.

Just read man mkvmerge.

> 
> --John Ratliff
> 
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