[MEncoder-users] B-frames and GOP with MPEG-2 for DVD
nicola_sabbi at fastwebnet.it
Thu Jun 7 22:25:38 CEST 2007
Nicolas Hesler wrote:
>Can anyone offer any input to the following command line?
>I've been trying to refine for the highest possible quality of MPEG-2
>while staying DVD compliant. The source is 24fps.
>(Note: format=mpeg2, because format=dvd does not work with Adobe Encore
> From what I understand, keeping GOP open, improves quality. Is this
>true? Is it 100% DVD compliant?
I'm not sure, but IIRC gops should be closed in dvds
>Do I want to introduce B frames in my encoding? (The vb_strategy part of
>my command line is currently useless, right?) If parts of my video are
>reaching into 9-10 Mbs bitrate, would it beneficial to introduce
>B-Frames? Will it improve quality?
no, they will only harm quality
> (This is probably a stupid question)
>Are the sync issues with bframes only relevant to mpeg4 or lavf?
with lavf managed by mencoder: always
>mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=mpeg2:tsaf:telecine /
>-vf scale=720:480,harddup -mc 0 -noskip -srate 48000 -af
>lavcresample=48000:0:2 -lavcopts /
>-ofps 24000/1001 -o $output $input
this -mc 0 -noskip is a myth, as far as I'm concerned: it may do some good
with -ovc copy, but not when encoding video
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