Hi,
There are problems with this fix. Although with 30000:1001 its watchable,
the audio is off from the start.
If my origional problem is caused by a frame rate change later in the mpg
are there tools that can sort this out ? Are there timecodes on the frames
in the mjpeg file that would allow this to happen ?
Any ideas ?
Thanks,
Stuart
On Thursday 29 May 2003 20:52, Stuart Hodges wrote:
> Hi,
>
> Here is the output requested and some extra for 30000:1001 and 60000:1001.
>
> head -n1 stream.yuv
> YUV4MPEG2 W320 H240 F59939998:1000000 Ip A0:0
>
> cat stream.yuv | yuvfps -v2 -r 30:1 | head -n1
> INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
> utility for yuv streams
> INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
> <[EMAIL PROTECTED]>
> INFO: [yuvfps] yuv2fps -h for help, or man yuv2fps
> INFO: [yuvfps] Converting from 29969999:500000 to 30:1
> YUV4MPEG2 W320 H240 F30:1 Ip A0:0
>
> cat stream.yuv | yuvfps -v2 -r 30000:1001 | head -n1
> INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
> utility for yuv streams
> INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
> <[EMAIL PROTECTED]>
> INFO: [yuvfps] yuv2fps -h for help, or man yuv2fps
> INFO: [yuvfps] Converting from 29969999:500000 to 30000:1001
> YUV4MPEG2 W320 H240 F30000:1001 Ip A0:0
>
> cat stream.yuv | yuvfps -v2 -r 60000:1001 | head -n1
> INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
> utility for yuv streams
> INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
> <[EMAIL PROTECTED]>
> INFO: [yuvfps] yuv2fps -h for help, or man yuv2fps
> INFO: [yuvfps] Converting from 29969999:500000 to 60000:1001
> YUV4MPEG2 W320 H240 F60000:1001 Ip A0:0
>
> I added some printf's to yuvfps, thus:
> srcInc = src_frame_rate.n * frame_rate.d ;
> dstInc = frame_rate.n * src_frame_rate.d ;
>
> fprintf (stderr,"srcInc %d\n",srcInc);
> fprintf (stderr,"dstInc %d\n",dstInc);
>
> write_error_code = Y4M_OK ;
>
> The output when given 30000:1001 is:
>
> cat stream.yuv | /home/schodge/dvd/cvsmjpegtools/mjpeg_play/lavtools/yuvfps
> -v2 -r 30000:1001 | head -n1
> INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
> utility for yuv streams
> INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
> <[EMAIL PROTECTED]>
> INFO: [yuvfps] yuv2fps -h for help, or man yuv2fps
> INFO: [yuvfps] Converting from 29969999:500000 to 30000:1001
> srcInc -64802073
> dstInc 2115098112
> YUV4MPEG2 W320 H240 F30000:1001 Ip A0:0
>
> I changed srcInc and dstInc to unsigned longs and things look good. I will
> run a test through and try to sync the audio.
>
> Thanks,
>
> Stuart
>
> On Thursday 29 May 2003 10:23, Matto Marjanovic wrote:
> > Hiya,
> >
> > > yuvfps reports:
> > >cat stream.yuv | yuvfps -v2 > debout
> > > INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
> > > utility for yuv streams
> > > INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
> > ><[EMAIL PROTECTED]>
> > > INFO: [yuvfps] yuv2fps -h for help, or man yuv2fps
> > > INFO: [yuvfps] Converting from 29969999:500000 to 29969999:500000
> >
> > "stream.yuv" is the stream captured by "GATOS", right?
> >
> > Could you send us the output of
> > "head -n1 stream.yuv",
> > and the output of
> > "cat stream.yuv | yuvfps -v2 -r 30:1 | head -n1"
> >
> >
> > The problem is most probably due to a bug in yuvfps's resample()
> > function, due to the logic of this code:
> >
> > srcInc = src_frame_rate.n * frame_rate.d ;
> > dstInc = frame_rate.n * src_frame_rate.d ;
> > ...
> > while( Y4M_ERR_EOF != read_error_code && write_error_code == Y4M_OK
> > ) { ...
> > currCount += srcInc ;
> > while( currCount >= dstInc && Y4M_ERR_EOF != read_error_code ) {
> > currCount -= dstInc ;
> > ++src_frame_counter ;
> > ...
> > }
> > }
> >
> > The multiplications in the assignments of "srcInc" and "dstInc" have
> > certainly overflowed. They should be made into big, fat 64-bit int's,
> > and/or some check for overflow should be made.
> >
> > Also, GATOS, or whatever produced the stream, should be fixed. I'm
> > guessing that the headers will show that it is specifying
> > "59939998:1000000" as the framerate, which is dumb --- that should be
> > "60000:1001", if anything.
> >
> > -matt m.
> >
> >
> >
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