On Mon, 22 Nov 2010 13:11:11 +0100 Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx> wrote: > > > since 2.6.36 + the regression fix in [1] (please apply it): > > > 3a. dmesg shows the message: ov534: frame_rate: xx > > > 3b. guvcviews gives some errors and the preview image halts: > > > VIDIOC_QBUF - Unable to queue buffer: Invalid argument > > > Could not grab image (select timeout): > > > Resource temporarily unavailable > > > > Reverting f7059eaa285c0460569ffd26c43ae07e3f03cd6c brings the old > > behaviour back. So something there is not happy with changing frame > > rate on the fly. > > Jean-FranÃois, I'll try to take a deeper look this week, but please > tell me if you have any guess about what can cause this issue. Hi Antonio, I implemented dynamic frame rate change in ov519 for the ov530-ov7670 webcam I have, and it works well. In the ms-win file ov534.inf (for webcam 05a9:0531), I found sequences to stop and restart streaming: HKR,%CamSet%, BlockStream, 1, e0,08,ff HKR,%CamSet%, StartStream, 1, e0,00,ff In the ov534 driver, these are: ov534_reg_write(gspca_dev, 0xe0, 0x08); ov534_reg_write(gspca_dev, 0xe0, 0x00); So, you may try to block streaming when changing the frame rate (some delay may also help..). Best regards. -- Ken ar c'hentaà | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ -- 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
