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Thu Jan 11 12:11:47 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027278.html

Michel Bardiaux wrote:

> Sean wrote:
>
>> Greetings,
>>
>> Can anyone help me on how to calculate each packet's
>> duration in milliseconds for VOB format video?
>>
>
> There is no such thing as the 'duration' of a particular packet. You 
> will have to reformulate your question using correct technical terms.
>
> Greetings,

assuming mpeg1video the duration of a frame is 1/framerate;
as for mpeg2, when the various telecining flags are set the duration may
be modified from 1/framerate up to 3/framerate in 0.5/framerate steps.
see mplayer/libmpdemux/mpeg_hdr.c for more details

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[Ffmpeg-devel] How to calculate a packet's duration in milliseconds for VOB format video?