JHi Andrew, On Tuesday 31 August 2010 08:31:12 Andrew Leech wrote: > Hi All, > I'm trying to develop a UVC video grabber device, which captures interlaced > PAL video. My hardware (custom firmware on LPC3131 with a TVP5147 analog > frontend) is working to the point of streaming video but I can't get the > computer to deinterlace the picture. The desired frame specs are a > resolution of 768x576 @ 25fps, YUY2 16Bit. The video I'm streaming currently > is each field separately, ie half frames at double the frame rate of 768x288 > @ 50fps. The way I read the UVC specs this should be a supported standard > (One field per sample). I can't seem to get the computer to think so > however, it just shows the half height double rate frames. Is one field per > sample format supported in the UVC driver, and if so how you to inform the > driver of the format correctly.
The UVC driver doesn't support interlaced formats yet. Want to submit a patch ? :-) > I've included my descriptors in the hope someone might see something there > that's askew, but I feel I've tried a lot of different things there with no > positive results. One thing I noticed, it's reporting 2 fields per frame in > the interlaced flags, whereas bit 1 set should read as One field per frame > according to the spec, so lsusb is reporting wrong... a minor bug. Thanks for the reporT. I've sent an lsusb patch to the linux-usb mailing list. > UVCview in windows reports it right for what it's worth. On the flip side, > lsusb seems to report bmVideoStandards correctly unlike UVCview, which gets > those flags offset. > > I'm guessing that the interleaved line format is more common for interlaced, > but that would require full frames worth of ram in my hardware which I just > don't have (I've got 96KB total ram where a half frame requires ~430KB). > > I've been working on this for over a week and am really at a loss, any help > would be very much appreciated. Support for interlaced formats "just" needs to be implemented in the uvcvideo driver. -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
