[linux-dvb] Problems playing still-frames or video

[Ralph Metzler <rjkm@convergence.de>]

Franz Ackermann writes:
 > I was trying to output a videostream consisting of iframes only. the
 > stream plays fine in software players (but tsmpegenc tells it has underruns), 
 > but if i cat it to /dev/video, the only results are messages like:
 > 
 > dvb: Playing ES
 > MPEG0: video:  ASPECT: 1:1  Size = 512x384  FRAMERATE: 25 fps  BRate: 2.0 Mbit/s
 > and the screen blanks out.
 > MPEG0: PAL mode
 > 
 > after several days of trying, I decided to use the VIDEO_STILLPICTURE
 > ioctl, same results. Actually IŽd prefer to put out stillframes, because
 > I may not be able to go on without dropping input frames.
 > 
 > I use libfame to generate the videostreame, and a modified version to
 > generate the sole iframes. The still-picture-ioctl returns 0, as if the
 > format would be ok.
 > 
 > If I use a different input-stream, 384x288, I get a picture, however only
 > at half of its horizontal size.
 > 
 > so, 1) why wont it display at the higher resolution, and why might it show
 > on half on lower? can somebody send me an iframe binary that displays correctly?perhaps I got its format wrong, but the card seems to accept a lot of
 > variations. a clear definition would be great.

The card can only properly scale the common DVB resolutions like
704x576, 480x576, 352x288, ...

 
 > and 2) is there some way to get uncompressed data into the card? (I know
 > there is no such thing within the api) On a celeron 800, I am unable to decode

You can transfer uncompressed images using the OSD. But since OSD
memory is so small you cannot do much with this.


Ralph

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