[theora] Fwd: DVD NTSC video plays twice as fast when encoded with libtheora

Keith Richie disturbed1976 at gmail.com
Fri Jun 19 23:27:53 PDT 2009

---------- Forwarded message ----------
From: Keith Richie <disturbed1976 at gmail.com>
Date: Sat, Jun 20, 2009 at 2:23 AM
Subject: Re: [theora] DVD NTSC video plays twice as fast when encoded
with libtheora
To: Jason Self <jason.self at gmail.com>

On Sat, Jun 20, 2009 at 1:59 AM, Jason Self<jason.self at gmail.com> wrote:
> On Fri, Jun 19, 2009 at 10:56 PM, Jason Self <jason.self at gmail.com> wrote:
>> https://roundup.ffmpeg.org/roundup/ffmpeg/issue1197
>> I had originally encountered this problem using ffmpeg2theora. I
>> switched to ffmpeg proper in an attempt to identify where the problem
>> was at, and found that the problem persisted. As a result I had
>> thought this was a problem with ffmpeg, but the ffmpeg folks seem to
>> indicate that this is specific to Theora (too much finger pointing I
>> think.) I can confirm that switching codecs does solve the problem,
>> though. Anyone care to weigh in? A small section (10MB) of the
>> problematic video can be obtained from
>> http://shows.bluehome.net/kfp_small.vob.
> One other thing: I can run the DVD through HandBrake (which makes use
> of libavcodec and libavformat from the FFmpeg project) using
> Theora/Vorbis and it's perfectly fine.
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Works fine for me as well.

ffmpeg -i kfp_small.vob -croptop 56 -cropbottom 56  -aspect 2.35 -r
24000:1001 -f yuv4mpegpipe - | sh
libtheora-1.1alpha2/examples/encoder_example -v 9 - -o small.ogv

ffmpeg -i kfp_small.vob -vn -ac 6 -f wav - | oggenc -R 48000 -C 6 - -o out.ogg

oggz-merge -o kfp_small.ogv small.ogv out.ogg

Here's a link -

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