Le dimanche 27 juillet 2014 à 20:21 +0200, Hans Verkuil a écrit : > If cropcap returns -EINVAL then that means that the current input or > output does > not support cropping (for input) or composing (for output). In that case the > pixel aspect ratio is undefined and you have no way to get hold of that information, > which is a bug in the V4L2 API. > > In the case of an m2m device you can safely assume that whatever the pixel aspect > is of the image you give to the m2m device, it will still be the same pixel > aspect when you get it back. In fact, I would say that if an m2m device returns > cropcap information, then the pixel aspect ratio information is most likely not > applicable to the device and will typically be 1:1. > > Pixel aspect ratio is only relevant if the video comes in or goes out to a physical > interface (sensor, video receiver/transmitter). So far "not applicable" has been interpreted as not implemented / ENOTTY. Can't CODA just do that and we can close this subject ? Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
