[GEM-dev] 2nd outlet of [pix_film]

IOhannes m zmölnig zmoelnig at iem.at
Mon Jan 4 15:17:30 CET 2010


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Jack wrote:
> Hello Iohannes,
> 
> Thanx for your answer.
> Here is what i get from qtinfo :
> 
> Type: AVI
>   1 audio tracks.
>     2 channels, 0 bits, sample rate 48000, length 273663360 samples,
> wav_id 0x55.
>     Sample format: 16 bit signed.
>     Channel setup: Not available
>     Language: eng
>     supported.
>   1 video tracks.
>     576x320, depth 12
>     rate 12.500000 [25:2] not constant
>     length 142530 frames
>     compressor XVID.
>     Native colormodel:  YUV 4:2:0 planar
>     Interlace mode:     None (Progressive)
>     Chroma placement: MPEG-2
>     No timecodes available
>     supported.
>   0 text tracks.
> 
> It seems i have 'rate 12.500000 [25:2] not constant'. What does it
> mean ?
> So in my case, i would like to get 25 (from [pix_film]) to play my movie
> at a 'normal' speed.
> Is there a way to get this ?

hmm, i can only think of 2 issues here:
- - either libquicktime is buggy and wrongly detects the framerate as 12.5
(it says 25:2, because framerates are usually expressed as an integer
numerator/denumerator pair)
- - or your video has indeed a variable framerate, with the default (or
1st frame) at 12.5fps, and then speeding up the video to 25fps

gem only reports the framerate after opening, so it doesn't really
handle variable framerates at all.
if the problem is indeed libquicktime related, you could also try to
compile Gem with gmerlin_avdec support and see whether this helps (even
though the author of libquicktime and gmerlin_avdec is the same; so the
bug might be in both libs)

> At least, I can use qtinfo and grep with [shell].

yes; but what would that help?

mgdasr
IOhannes

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