> If the user application has set up both video and vbi formats, what does > a read() call return? Video or vbi data? Whatever the last (successful) S_FMT call specified in ->type. If you want to read both video and vbi by reading from /dev/video0, you have to open the device two times and use one filehandle for video and one for vbi. The same is true for streaming capture btw. bttv + saa7134 will refuse to set vbi formats if video capture is active on the same file handle and visa versa. This should be explicitly stated in the new, not-yet finished v4l2 docs ... Ideally the same should be done for overlay + capture (i.e. you can't do both with the same file handle). But we can't do that without breaking v4l1 backward compatibility :-/ Gerd -- You can't please everybody. And usually if you _try_ to please everybody, the end result is one big mess. -- Linus Torvalds, 2002-04-20
