Em Mon, 01 Oct 2018 08:42:56 -0400 Nicolas Dufresne <nicolas@xxxxxxxxxxxx> escreveu: > Hello Hans, > > Le lundi 01 octobre 2018 à 10:43 +0200, Hans Verkuil a écrit : > > It turns out that we have both JPEG and Motion-JPEG pixel formats defined. > > > > Furthermore, some drivers support one, some the other and some both. > > > > These pixelformats both mean the same. > > > > I propose that we settle on JPEG (since it seems to be used most often) and > > add JPEG support to those drivers that currently only use MJPEG. > > Thanks for looking into this. As per GStreamer code, I see 3 alias for > JPEG. V4L2_PIX_FMT_MJPEG/JPEG/PJPG. I don't know the context, this code > was written before I knew GStreamer existed. It's possible there is a > subtle difference, I have never looked at it, but clearly all our JPEG > decoder handle these as being the same. > > https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/sys/v4l2/gstv4l2object.c#n956 The code at libv4l handles both MJPEG and JPEG the same way. PJPG is handled somewhat differently (although it uses the same code). There is a code there that cleanups some Pixart-specific headers. Thanks, Mauro
