[FFmpeg-user] dv => mp4: deinterlace or not, and how?
seandarcy2 at gmail.com
Thu May 5 22:19:57 CEST 2011
I have an interlaced dv file. I'm transcoding it with x264 to mp4.
1. ffmpeg -i file.dv -an -vcodec libx264 -b <x> out.mp4
If I just leave it like that, is out.mp4 interlaced or progressive?
2. ffmpeg -i file.dv -an -vcodec libx264 -b <x> -deinterlace out.mp4
Here I assume out.mp4 is progressive. The ffmpeg documentation says:
"The alternative is to deinterlace the input stream with `-deinterlace',
but deinterlacing introduces losses."
Is this still true?
Given this note about losses, am I right we should never deinterlace?
Almost never? When is deinterlacing required/better?
3. ffmpeg -i file.dv -an -vcodec libx264 -b <x> -flags +ilme+ildct out.mp4
Here I assume out.mp4 is interlaced. How is this different from 1.
above? Is it different?
The FAQ mentions +alt as a flag. When should this be added? Does it hurt
to use it all the time?
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