Re: MPEG-2 Problems

On Fri, 2006-02-24 at 15:31 -0600, Brian Brice wrote:

> This works great and looks as I expected.  Now this leads to another
> question.  What about using the mpeg2video output format?
> 
>      ffmpeg -i sample.mpg -f mpeg2video -vcodec mpeg2video test.m2v

I don't know the subtleties between "vob" and "mpeg2video".

> When specifying an output file with the m2v extension, it guesses the
> mpeg2video output format and mpeg2video codec, but something in the
> output seems "off".  I downloaded a few m2v videos to test the players I
> was using to see if they showed way off durations and that was not the
> case.  Here are some durations reported with the 5 second clip, ffmpeg
> MPEG2 file:
> 
>      Windows Media Player: 40865:59:01
>      DivX Player: -300212:-29:-15
>      Real Player: 18:03:13:24
> 
> In other clips I found, all 3 players showed the same duration for
> these.  Viewing the m2v files in a hex editor showed they all start with
> the video sequence header (0x000001b3) instead of a program stream pack
> header.

That I cannot comment upon, I do know that mpeg ps does not store the
video length in any way, so I guess it's rather pointless for an
application to show it, or it has to go through the complete file to
count all frames.

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