[mpeg2] Re: kfir, mpeg1 and vcd problem...

[Lawrence Gold <gold@shell.aros.net>]

On Sun, Sep 08, 2002 at 07:26:54PM +0200, Alessandro Marzini wrote:
>
> Then I would like have my VCD with that movie and here start the problem.
> Nero Burning told me that my movie is not vcd complaint and also vcdimager on 
> linux tell me some thing of wrong.
> So, I ask if some one know which setting and which tools use on linux to make 
> my VCD. Sure I love kfir because it encodes in realtime, so I would not use 
> some tools that demux, decode and then mux and reencode my stream...I will 
> lost the realtime fashion :-)

Using mpeg_stat from the Berkeley MPEG tools, I was able to get very close 
to having a compliant MPEG.  However, the one problem I could never solve 
was having motion vectors that are too long:

MPEG-Viewer requirements:
	Pixel aspect ratio of 1 (VGA)
	Required display speed: 29.97 frames/sec
	Specified bit rate is 1.15 MBits/sec (2875 * 400bits/sec)
	Requested buffer size is 20K ints (16 bits/int).
	And the constrained parameter flag is off.
	The stream does not meet the constrained parameter requirements,
	due to the following factors:
		Motion vectors are larger than 8 (f_code>4)

I tried tweaking numerous settings in the driver but didn't have any luck.  
If you can figure out how to get your streams to meet the constrained 
parameters, you may end up with a VCD-compliant movie.