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On Jan 28, 2007, at 10.33, Iain MacGranthin wrote:
Forum:
When I record DVB recordings in Kaffeine, the aspect ratio is 16:9,
with the wxh shown as similar to 4:3, but the presentation in
whatever player I choose is correct. This remains true after
editing with dvbcut to libavformat mpeg as well.
So the stream is 16:9 anamorphic, right?
When I transcode them to xvid , using no options to specify
appearance, or using --export-asr 3 on its own does not work, but
gives a 4:3 ratio on playback with automatic ratio selection.
Stipulating aspect ratio 3, and wxh 720x400 gets me a good result,
but I lose about 7fps speed in doing this, from having a rate of
about 30fps, to about 23fps.
Is there a command line option I can use to retain the correct
appearance WITHOUT losing transcoding speed?
Not if you're exporting to AVI. AVI, last I checked, didn't really
have support for anamorphic aspect ratios. That 7 fps loss you're
seeing is the video being resized so it retains its aspect ratio with
square pixels. My advice is after transcoding them, throw 'em in a
Matroska container and specify your aspect ratio in there. Most
decent players will respect that.
P.S. Next time please create a new thread instead of replying to a
different one and changing the subject line. This throws off the auto-
threading that many e-mail clients use these days.
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