Re: [Semi-OT] Cropping a letterbox MPEG-2 file is easy enough...

On 2010-12-10 22:03:55 -0600, Ron Johnson wrote:
But how do I save the output?

After reading the mplayer and ffmpeg man page and Googling, these
are the three methods I tried, but none of them work.

$ mplayer foo.mpeg -vf crop=720:352:0:64 \
-dumpstream -dumpfile bar.mpeg

$ mplayer foo.mpeg -vf crop=720:352:0:64 -o bar.mpeg

$ mencoder foo.mpeg -vf crop=720:352:0:64 \
-ovc copy -oac copy -o bar.mpeg

$ ffmpeg -i foo.mpeg -vf crop=720:352:0:64 \
-vcodec copy -acodec copy bar.mpeg

How about this one:

mencoder foo.mpeg \
-vf crop=720:352:0:64 \
-oac copy \
-ovc lavc \
-lavcopts vcodec=mpeg2video \
-o newfile.avi

This one is a little tricky, because mencoder will transcode
your file if you're not careful. So this part...

-ovc lavc -lavcopts vcodec=mpeg2video

...needs to change according to what your source material is.
I think the above might work for DVD material?

(Yes, Handbrake makes the job trivial, but no, I don't want to
transcode the file, just "crop and save". Disk is cheap and I want
to retain DVD quality.)

I also hate to have quality degraded, which happens very easily
with videos.

Hope this helps,

Phil


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