[Fwd: Re: [Mjpeg-users] [Fwd: yuv4mpeg export feature refinement]]

[Robert W. Fuller]

This should have gone to the list....
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Thank you for the reply.  That header looks delightfully easy to edit.  
Here's one from one of my transcode exports:

   YUV4MPEG2 W704 H480 F30000:1001 Ip A0:0
   FRAME
Is the yuv4mpeg man page the best documentation for the header format?

Regards,

Rob

Steven M. Schultz wrote:

On Wed, 7 Jan 2004, Robert W. Fuller wrote:

When you export from a quicktime file to yuv4mpeg, transcode sets the 
frame order to "progressive/none."  This does not work well with 
programs like "yuvkineco" which will not perform de-interlacing 
unless ...


    That's a very common problem with programs that have yuv4mpeg2
    output - the header fields are rarely 100% correct.
By the way, is there a simple editor for yuv4mpeg headers?


    Not directly, but there are a couple approaches one could take.

    Write a simple wrapper shell script that does a 'read' to get
    the first line - parse it out and replace the necessary tags, echo
    that to echo out, and then pass the rest of the data thru untouched
    with cat.
    The other approach uses a couple simple utilities (only in the
    cvs version of mjpegtools at the moment I believe) in a pipeline.
    'y4mtoyuv' to strip out the header and frame markers, and then
    'yuv4mpeg' with all the parameters explicitly set.   SLightly
    inefficient to go thru a couple process pipeline but it is 
    simple.   Something like ' ...produce y4m... | y4mtoyuv |
    yuv4mpeg -i t -r 30000:1001 -a 10:11 -w width -h height | mpeg2enc 
...

    Cheers,
    Steven Schultz



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