[theora] Fwd: ffmpeg2theora 0.24 regression: accelerated video output (converted from h264)

[Keith Richie]

---------- Forwarded message ----------
From: Keith Richie <disturbed1976 at gmail.com>
Date: Thu, Jul 16, 2009 at 5:37 AM
Subject: Re: [theora] ffmpeg2theora 0.24 regression: accelerated video
output (converted from h264)
To: Michael Opdenacker <michael at free-electrons.com>


On Thu, Jul 16, 2009 at 3:10 AM, Michael
Opdenacker<michael at free-electrons.com> wrote:
> Here's another problem I have with the 0.24 version of ffmpeg2theora.
>
> When I try to convert a h264 file to theora...
> (Note that for size and runtime reasons, foo.mts is a truncated file,
> I just took the first 32MB of the original file)
> ffmpeg2theora-0.24.linux32.bin foo.mts -x 1280 -y 720 -o
> foo-ffmpeg2theora-0.24.ogv
>
> Input #0, mpegts, from 'foo.mts':
>  Duration: 00:00:15.83, start: 1.000067, bitrate: 16946 kb/s
>  Program 1
>    Stream #0.0[0x1011]: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR
> 16:9], 50 tbr, 90k tbn, 50 tbc
>    Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
>  Pixel Aspect Ratio: 1.00/1   Frame Aspect Ratio: 1.78/1
>  Resize: 1920x1080 => 1280x720
>      0:00:07.79 audio: 82kbps video: 4254kbps, time remaining: 00:01:34
>
> When I try to play the ogv file, the video stream is playing at accelerated
> speed, while the audio speed is the same as in the original.
> Same issue with version 0.24-svn20090716.
>
> This didn't happen with version 0.23:
> ffmpeg2theora-0.23.linux32.bin foo.mts -x 1280 -y 720 -o
> foo-ffmpeg2theora-0.23.ogv
>
> Input #0, mpegts, from 'foo.mts':
>  Duration: 00:00:15.80, start: 1.040000, bitrate: 16989 kb/s
>  Program 1
>    Stream #0.0[0x1011]: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR
> 16:9], 25.00 tb(r)
>    Stream #0.1[0x1100]: Audio: liba52, 48000 Hz, stereo, s16, 256 kb/s
>  Pixel Aspect Ratio: 1.00/1   Frame Aspect Ratio: 1.78/1
>  Resize: 1920x1080 => 1280x720
> [h264 @ 0xa804050]B picture before any references, skipping
> [h264 @ 0xa804050]decode_slice_header error
> [h264 @ 0xa804050]no frame!
> [h264 @ 0xa804050]B picture before any references, skipping
> [h264 @ 0xa804050]decode_slice_header error
> [h264 @ 0xa804050]no frame!
> [h264 @ 0xa804050]B picture before any references, skipping
> [h264 @ 0xa804050]decode_slice_header error
> [h264 @ 0xa804050]no frame!
> [h264 @ 0xa804050]B picture before any references, skipping
> [h264 @ 0xa804050]decode_slice_header error
> [h264 @ 0xa804050]no frame!
>      0:00:15.09 audio: 83kbps video: 2149kbps, time elapsed: 00:01:46
>
> All the input and output files are available
> on http://free-electrons.com/issues/ffmpeg2theora-jul13-2009/
>
> I hope this will be useful. Don't hesitate to ask me to make more
> experiments.
>
> Kind regards,
>
> Michael.
>
> --
> Michael Opdenacker, Free Electrons
> Kernel, drivers and embedded Linux development,
> consulting, training and support.
> http://free-electrons.com
> + 33 621 604 642
>
> _______________________________________________
> theora mailing list
> theora at xiph.org
> http://lists.xiph.org/mailman/listinfo/theora
>


---------dang gmail ------------------------
forwarded to theora list.


Was this originally 25fps?
Add --inputfps 25 -F 25
or 24
or 24000:1001 (23.976)
or 30
or 30000:1001 (29.970)

This is an all too common error with ffmpeg not correctly identifying
the input fps.