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

[Steven M. S. <sm...@2B...>]

> 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