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List:       theora
Subject:    Re: [theora] Accelerated video output with ffmpeg2theora 0.24
From:       Juhani Jaakola <juhani.jaakola () kolumbus ! fi>
Date:       2009-09-19 18:12:40
Message-ID: 7440720.6677111253383961228.JavaMail.juhani.jaakola () kolumbus ! fi
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I don't know why the framerate of the input file is 25.02. The input file is produced \
by Ulead Video Studio, which captures video from VHS tapes (PAL format) via an USB \
frame grabber. It produces .AVI files. The frame rate of PAL is 25 fps.

When I convert those .AVI files to H.264/AAC or to xvid/MP3 with Avidemux, they play \
without problems. It is only the ffmpeg2theora which causes problems. And I have \
problems with ffmpeg2theora with and without those parameters (see my original \
message).

Regards, JJ

j@v2v.cc kirjoitti: 
> Juhani Jaakola wrote:
> > Does anybody have a clue what might be the problem here?
> > 
> > On 09/06/2009 01:00 PM, Juhani Jaakola wrote:
> > > When I converted two files with ffmpeg2theora their duration changed shorter - \
> > > they seem to play back with accelerated speed. When I play one of them with \
> > > VLC, the video stops at 99 seconds but audio continues until 170 seconds. The \
> > > other file is 120 seconds long but it is played back in 80 seconds. 
> > > Here is ffmpeg2theora output:
> > > 
> > > $ ffmpeg2theora --optimize --inputfps 25 -F 25 2002-05-23\ Juho\ prinssina.AVI
> > > Input #0, avi, from '2002-05-23 Juho prinssina.AVI':
> > > Duration: 00:02:36.76, start: 0.000000, bitrate: 107321 kb/s
> > > Stream #0.0: Video: rawvideo, yuyv422, 720x576, 25 tbr, 25 tbn, 25 tbc
> > > Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
> > > Resize: 720x576
> > > 0:02:36.76 audio: 78kbps video: 8080kbps, time elapsed: 00:13:26
> > > 
> > > $ ffmpeg2theora --inputfps 25 -F 25 196X\ Juhani\ pienenä\ LAAJEMPI\ VERSIO.AVI
> > > Input #0, avi, from '196X Juhani pienenä LAAJEMPI VERSIO.AVI':
> > > Duration: 00:01:59.59, start: 0.000000, bitrate: 109973 kb/s
> > > Stream #0.0: Video: rawvideo, yuyv422, 720x576, 25.02 tbr, 25.02 tbn, 25.02 tbc
> > > Resize: 720x576
> > > 0:01:19.31 audio: 0kbps video: 5449kbps, time remaining: 00:04:19
> > > 
> why does the input file have a framerate of 25.02? forcing input
> framerate might not work, it was mostly used for video4linux devices.
> but can have a look in the source to see if it can be extended to also
> overwrite the framerate from the input container.
> 
> 
> j
> 

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