[vlc-devel] Re: Mpeg ps test results
mfmbusiness at earthlink.net
Sat Mar 19 12:47:56 CET 2005
Thanks for the info. I'm not really trying to go to 20 for a file, but
rather trying to get normal rates out:
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
(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)
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
> 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
> 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
> 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
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