Comments (2)
This is from the code example (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html). The documention of ioctl VIDIOC_REQBUFS (http://linuxtv.org/downloads/v4l-dvb-apis/vidioc-reqbufs.html) says 'A larger number is also possible when the driver requires more buffers to function correctly', but I haven't found out so far which function need what number of buffers.
I'll have a look into it as soon as I have some spare time :)
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So this is a legitimate overhead for working on as many devices as possible.
For me it was possible to reduce it to 1 without side-effects (with uvcvideo - otherwise I had 5 pictures delay in my video transmission).
(I am working on a RC-Car with video transmission: fubar.ath.cx/upstream/wiki)
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