On Sun, 2 Nov 2003, Laurent Pinchart wrote:
> > tccat | mplayer -vo yuv4mpeg | head -1
>
> YUV4MPEG2 W720 H576 F25000000:1000000 Ip A0:0
>
> Is that valid ? Note that I don't get the error on the first frame, but on
> frame 15:
If you really do have a progressive stream it's valid. Otherwise
the interlace tag 'Ip' is wrong. It should be either It (top
field first) or 'Ib' (bottom field first). Most DVDs that I
have looked at are 'It' while DV (from a analog->DV capture) is
always Ib (bottom first).
The 'A' tag isn't right but that's usually not a problem because
0:0 means unknown and most tools will use a (hopefully correct)
default. You may want to explicitly set a pixel aspect though
(either 10:11 for NTSC or 59:54 for PAL, assuming a 4:3 movie -
for 16:9 movies the values are of course different).
> INFO: [yuvscaler] yuvscaler 1.6.1.90 (10-02-2003) is a general scaling
> utility for yuv frames
> INFO: [yuvscaler] (C) 2001-2003 Xavier Biquard <[EMAIL PROTECTED]>,
> yuvscaler -h for help, or man yuvscaler
> INFO: [yuvscaler] SVCD output format requested in PAL/SECAM norm
> INFO: [yuvscaler] input: frame size: 720x576 pixels (622080 bytes)
> INFO: [yuvscaler] input: frame rate: 25/1 fps (~25.000000)
> INFO: [yuvscaler] input: interlace: none/progressive
> INFO: [yuvscaler] input: sample aspect ratio: ?:?
> INFO: [yuvscaler] from 720x576, take 720x576+0+0,
> NOT_INTERLACED/PROGRESSIVE
Yep - yuvscaler saw the "progressive" tag and logged that for
you.
> INFO: [yuvscaler] scale to 480x576, 480x576 being displayed
> INFO: [yuvscaler] Scaling uses the RESAMPLE algorithm,
> INFO: [yuvscaler] frame rate: 25.000 fps
> INFO: [yuvscaler] Scaling ratio for width is 3 to 2
> INFO: [yuvscaler] and is 1 to 1 for height
> INFO: [yuvscaler] Specific downscaling routing number 6
> INFO: [yuvscaler] output: frame size: 480x576 pixels (414720 bytes)
> INFO: [yuvscaler] output: frame rate: 25/1 fps (~25.000000)
> INFO: [yuvscaler] output: interlace: none/progressive
> INFO: [yuvscaler] output: sample aspect ratio: ?:?
> INFO: [yuvscaler] Frame number 0
> INFO: [yuvscaler] Frame number 1
> [...]
> INFO: [yuvscaler] Frame number 12
> INFO: [yuvscaler] Frame number 13
> INFO: [yuvscaler] Frame number 14
> INFO: [yuvscaler] Couldn't read FRAME header: bad header magic!
> **ERROR: [yuvscaler] Couldn't read frame number 15!
That means yuvscaler did not see the line "FRAME\n" when it
expected it.
To me that suggests that mplayer corrupted the output. Are
you running a current version of mplayer? I think that
some changes were made a little while ago in the yuv4mpeg area
(on the other hand I may have confused mplayer and ffmpeg - I
know the yuv4mpeg logic in ffmpeg was recently fixed and does
a better job now).
Next thing to try is dump the mplayer -vo yuv4mpeg output to
a file (not all of it of course - just the first 20 frames or
so) and find the 15 or 16th 'FRAME' word. That's not too hard
because the frame size is known (720x576*3/2).
Good Luck.
Cheers,
Steven Schultz
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