Re: em28xx: success report for KWORLD DVD Maker USB 2.0 (VS-USB2800) [eb1a:2860]

[Ivan <ivan.q.public@gmail.com>]

On 07/08/2010 05:49 PM, Devin Heitmueller wrote:
> That card does have an onboard scaler, although it's not clear to me
> why it isn't working.  Exactly what command line did you use?

At first, I was always using

mplayer tv:// -tv device=/dev/video1:input=1:norm=NTSC

which defaults to a resolution of 640x480. This output looked correct 
(except for vertical stripes) in kernel 2.6.32-23-generic, but was 
horizontally shifted after I updated to the current mercurial sources.

Then I noticed that

mplayer tv:// -tv device=/dev/video1:input=1:norm=NTSC:width=720

gives a correct picture with current hg source.

>> v4l2: 1199 frames successfully processed, -3 frames dropped.
 >> ...
>
> Yeah, I don't know.  You would have to ask the mplayer/mencoder people.

Ah, so those statistics are generated by mplayer, then, not by v4l.

>> It would also seem that V4L doesn't actually discard any frames...
 >> ...blah blah blah about mencoder...
>
> Again, this would be an mplayer/mencoder thing.

I guess I'm just trying to confirm that v4l doesn't try to enforce a 
strict NTSC framerate, but just passes all frames on even if they appear 
at a slightly different framerate.

Ivan