The 291 chip is 720P30, the 292 chip is 1080P30. They do decent h.264 compression. Some chips are better, a lot are worse. Both chips are fine for web cam use.
There is desktop app called cheese that will take snaphots. You can look at the source to see how it works. Note that these chips operate in a lot of different modes. streaming h.264 streaming mpeg JPEG stills uncompressed streaming uncompressed stills And all of this works without writing any more drivers. While you wait three weeks for things to come from China I have seen the Logitech HD Pro Webcam C920 recently on sale for $50. It is very similar. On Fri, Mar 11, 2016 at 6:08 PM, @lex <[email protected]> wrote: > Err... That was new to me. Without researching how do you grab video from > this generic driver how good this camera performs? > > On Friday, March 11, 2016 at 7:52:17 PM UTC-3, Jon Smirl wrote: >> >> On Fri, Mar 11, 2016 at 4:42 PM, @lex <[email protected]> wrote: >> > Seems to be a nice camera, but that depends on your kernel version. >> > There is no support for SN9C291 OV9712 on kernel v3.4.39. >> > And no support on odroid-3.8.30 on my U3 also. >> > Don't know about armbian legacy kernel version, but i don't expect there >> > will be support also. >> >> The camera does not need a specific driver, it uses the generic USB >> Video driver. >> It is like a USB mouse or keyboard, you don't need a specific driver >> for every different one. >> >> Drivers/Multimedia/Media USB/USB Video Class (UVC) >> >> Kconfig USB_VIDEO_CLASS >> >> This support dates way back to around 2.4 or so. Almost every desktop >> web cam works using this driver. >> >> > >> > On Friday, March 11, 2016 at 4:41:59 PM UTC-3, Jon Smirl wrote: >> >> >> >> On Fri, Mar 11, 2016 at 2:18 PM, Manuel Braga <[email protected]> >> >> wrote: >> >> > On Fri, 11 Mar 2016 05:53:36 -0800 (PST) Rosimildo DaSilva >> >> > <[email protected]> wrote: >> >> >> >> >> >> I did not mention, but I founf two issues withe blobs: >> >> >> >> >> >> a) Motion Detection causes segmentation fault, whenever enabled. >> >> >> b) FFMPEG complains that timestamp ( PTS/DTS ) are missing on the >> >> >> H264 stream generated by the encoder... I've tried many things ( >> >> >> code >> >> >> is commented out ), but nothing worked. >> >> > >> >> > There is another issue, that i believe to be important. >> >> > But for whatever reasons, it has to be constantly remembered about >> >> > its >> >> > existence. >> >> > >> >> > And that issue is: >> >> > >> >> > c) The proprietaries binary blobs don't have a clear license >> >> > attached. >> >> > >> >> > And in the copyright law, any "things" with "no license" by default >> >> > fell >> >> > in the "all rights reserved". >> >> >> >> I gave up fighting with Allwinner's encoder long ago. It is far easier >> >> to just plug in a USB based h.264 camera. You can easily buy ones from >> >> Logitech for $50. >> >> >> >> If you want it at the hardware level, look at chips from Sonix. Here >> >> is a board based on the SN9C291 for $8.50. The bare chips are about >> >> $4. >> >> >> >> >> >> https://world.taobao.com/item/40004211822.htm?spm=a312a.7700714.0.0.zGiipg#detail >> >> >> >> Note that this PCBA is the same price as most bare image sensors >> >> mounted on a flex cable. Plus I find it much easier to wire things >> >> with a simple USB cable instead of an FFC. >> >> >> >> The Sonix chips will appear as USB UVC devices when plugged into Linux >> >> and they will need no special drivers. They also work on Windows. >> >> >> >> >> >> >> >> > >> >> > -- >> >> > Manuel Braga >> >> > >> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> > Groups "linux-sunxi" group. >> >> > To unsubscribe from this group and stop receiving emails from it, >> >> > send >> >> > an email to [email protected]. >> >> > For more options, visit https://groups.google.com/d/optout. >> >> >> >> >> >> >> >> -- >> >> Jon Smirl >> >> [email protected] >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups >> > "linux-sunxi" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> > an >> > email to [email protected]. >> > For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> Jon Smirl >> [email protected] > > -- > You received this message because you are subscribed to the Google Groups > "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- Jon Smirl [email protected] -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
