[vlc-devel] Re: Mpeg ps test results

[Mark Moriarty]

Thanks for the info.  I'm not really trying to go to 20 for a file, but
rather trying to get normal rates out:
"23.976fps","24fps","25fps","29.97fps","30fps","50fps","59.94fps","60fps"

In this case, the basic goal is to output a 29.97 if I start with a 29.97,
whether VLC automatically does the transcode at the input rate, or I have to
force it via a --sout-transcode-fps.  Right now the output is pretty much 25
fps, for the PTS, no matter what the input fps or the specified
--sout-transcode-fps.

(You were right on the money that fps could be a problem, just trying to
understand what to do to get rid of the problem)

-----Original Message-----
From: vlc-devel-bounce at videolan.org [mailto:vlc-devel-bounce at videolan.org]
On Behalf Of Gildas Bazin
Sent: Saturday, March 19, 2005 4:31 AM
To: vlc-devel at videolan.org
Subject: [vlc-devel] Re: Mpeg ps test results

On Friday 18 March 2005 02:21, Mark Moriarty wrote:
>
> If I start VLC with a --sout-transcode-fps either greater than (say
29.97),
> or less than (say, 20.0) the actual 25 fps being used to generate the 
> PTS, the transcode is truly messed up.  I can see VLC moving very 
> rapidly
through
> the source file, definitely too fast to be doing video transcoding.  
> The output file size is small, also shows no video.  Finally, ProjectX 
> also reports no video found.
> 

In MPEG 2 video, only a few fps values are allowed (defined in the spec). 
Using anything else you will likely have ffmpeg bail out so end-up with no
transcoded video.

> 
> There's absolutely nothing wrong if VLC chooses to implement 25 fps as 
> the default --sout-transcode-fps.

The default for --sout-transcode-fps is 0 which means don't change the
original fps.

--
Gildas

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