[mythtv] V4L2 bug ??

Isaac Richards ijr at case.edu
Wed Feb 2 19:59:52 UTC 2005


On Wednesday 02 February 2005 11:29 am, myth wrote:
> V4l2 appears to be valid only for cx8800 capture cards and falls back to
> V4l for all other cards. I am using a BT878A capture card on a 2.6.8.1
> md kernel which does support v4l2 but  NuppelVideoRecorder is using
> this card via the V4l API rather than the V4l2 api. The V4l2 code in
> NuppelVideorecorder is using a slightly more efficient way of performing
> transfers (select).  A quick test, moving the brackets ( c code below)
> allows the v4l2 code to be used resulting in a significant speed increase.

Last time I tested things, using the v4l2 api for bttv cards was significantly 
less stable than using v4l.  Channel changes in particular seemed to kill 
capture quite regularly.

Isaac


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