Re: [Mjpeg-users] mpeg2enc CVS version

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

On Mon, 12 Jan 2004, James Finnall wrote:

> Thank you for all your help Steven, have CVS version built 
> and installed now.

	Hurrah!

> Built and installed the SDL, after I googled to find out what it is.

	AH, so my (strong) suspicion that the sdl.m4 file was the root
	cause of the problems turned out to be a good guess.   The SDL
	should be optional (but if you want to run yuvplay I think the SDL
	becomes required - so it is just as well that you have it installed
	now).

> Still had the quote warnings though from the other packages but it
> didn't stop it.

	Those I think are automake-1.8 being more verbose/picky - I've never
	seen those before with 1.7.9 or earlier.

> dvdauthor.  Perhaps you can clarify if what I am doing is correct before
> I post to the dvdauthor list.


> I created 10 photo scans and saved them as jpeg files and resized etc.
> Used jpeg2yuv to create the video stream and piped to mpeg2enc.  I used
> -f 8 for the format code code on the output.  Projects for me would be 
> NTSC so gave proper arguments for that.  Each of the streams should
> be 6 seconds in length, cat them together for a total of 60 seconds.
> 
> Copied the 60 second clip into a second file and cat'd the copy into the
> output file 29 times, for a total of 30 minutes of video.  Then used the same

	I do not believe  that 'cat'ing mpeg files together is the correct thing
	to do.    Better method would be to replicate the source frames and
	feed a large stream of input into mpeg2enc.

	Instead of creating 6 second clips and replicating 10 times it may
	be necessary to create a single 60 second movie.

> Created an xml file for just a simple DVD, no menus or anything. Tried to 
> use dvdauthor with the -x project.xml file and it keeps reporting:
> 
> dvdauthor: relocation error: dvdauthor: undefined symbol: xmlNewTextReaderFilename

	That looks like a libxml2 version problem - I do not know what
	the minimum version of libxml2 is required by dvdauthor but I suspect
	a newer version of libxml2 that contains xmlNewTextReaderFilename()
	is needed.

> So I changed to;
> dvdauthor -o test -f dvd/video.mpg
> 
> It creates the DVD structure dir in test and the a zero byte VOB file.
> Then it keeps reporting the same message over and over never ending.
> 
> WARN: System header found, but PCI/DSI information is not where expected
>         (make sure your system header is 18 bytes!)
> WARN: Skipping sector, waiting for first VOBU...
> WARN: Skipping sector, waiting for first VOBU...
> WARN: Skipping sector, waiting for first VOBU...

	That's the type of error I think comes from cat'ing mpeg files
	together.

> the program is waiting for.  At this point I am wondering if the problem is
> in using mp3 files that are 44 khz.  I read somewhere that 48 khz is required
> for DVD's.  But since mplex accepted the files, would it have resampled as 

	Quite true - the audio needs to be 48000 for DVDs.   While there are
	several video sizes that can be used the audio has to be at 48000.
	I don't think that's the the problem in this case though.

> If this is a dvdauthor type of problem and everything is OK with mjepgtools,
> then I will post there.

	At this point it looks like a dvdauthor issue.   I'm not sure how
	to create a slideshow with dvdauthor - but if it's possible then 
	dvdauthor probably has rules/guidelines on how to do it.   Perhaps
	creating mpeg still images and crafting some xml to say how long
	to display each image, etc.   

	Looks as if the mjpegtools-cvs configuration battle has ended in
	victory though - and thats good!

	Cheers,
	Steven Schultz
	I thought involved