>       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).

How do I check if the input is progressive or interlaced ? still images in 
mplayer don't show interlacing artifacts, does that mean that the input is 
progressive ?

>       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).

Ok.

> >    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).

I'm using 1.0-pre1.

>       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).

I did that, and can't see any problem in mplayer's output. the 'FRAME\n' are 
where they should be (checked up to the 20th). That confuses me a lot. If I 
dump the mplayer output to a file and give that to yuvscaler I get no error.

Laurent



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