Hi Paulo, I am using a quite powerful PC i5 2.8 8 Gig RAM, ... and even with lowest settings, 640 x 480 the result is the same. The audio always comes out first. If I choose a different audio source like my other Logitech C525 or Lifecam VX-2000 the recording of the Lifecam Cinema is fine and even syncron to audio. So I think it is a guvcview - uvc problem. In cheese it is also ok but cheese unfortunately records in low frame rates.
Steffen Am Mittwoch, den 07.09.2011, 16:58 +0100 schrieb Paulo Assis: > Hi, > if you are using any of the mpeg4 codecs, you will need a rather > powerful cpu for encoding at high frame rates, specially at any decent > resolution. > As an example I don't have any special problems with the following > configuration: > > device input: MJPEG 800x600@25 fps > video codec - mpeg 4 - avc (h264) > audio codec - mpeg2 > container - matroska > > 2.8.38 - 64bit kernel > hardware: intel QuadCore 2,8 Ghz (45nm), 4 GB ram > > but if I increase the input to 30 fps I'll only get about 28 when encoding. > > If you changed the codec to MJPEG, and still have issues then there > could be something wrong with your setup, is the audio OK except for > the sync issues? As for the sync issues, do you get the audio before > the video or vice versa ? > > Regards, > Paulo > > > 2011/9/7 Steffen <stes...@googlemail.com>: > > Hi Paolo, > > > > Thank you for your answer! > > > > I reduced the frame rate, resolution and changed the video codec. But > > still the same. Sound and audio is still unsyncron in guvcview. Cheese > > records all well but in 15 fps. > > > > Steffen > > > > > > Am Mittwoch, den 07.09.2011, 09:35 +0100 schrieb Paulo Assis: > >> Hi, > >> guvcview detects some sync issues, it seems although you select 30 > >> fps, for that resolution (1280x720) your hardware is just not powerful > >> enough to decode the MJPG stream and re-encode it with whatever coded > >> you are using. > >> Some solutions: > >> -reduce the fps > >> -reduce the resolution > >> -try using a less resource demanding video codec (MJPG will save the > >> video stream directly to disk, no compression is done in this case, > >> but it generates a huge file if compared with any of the mpeg codecs) > >> -use the matroska container instead of avi, it is much better since > >> individual frames are timed stamped. Avi only sets a average fps (15 > >> according to your log) > >> > >> Regards, > >> Paulo > >> > >> 2011/9/7 Steffen <stes...@googlemail.com>: > >> > Hello, > >> > > >> > I am testing Microsoft Lifecam Cinema now, but I am not able to record > >> > audio and video syncronusely with that cam and guvcview. The Logitech > >> > C525 works but has a crappy image. Also cheese works with both cams but > >> > has a little frame rate. Skype works for both. > >> > > >> > Do you have any ideas? I have already installed that medibuild version > >> > of uvc and the latest guvcview from the ppa. But the same result even > >> > with the old ubuntu natty versions. > >> > > >> > Steffen > >> > > >> > > >> > > >> > > >> > _______________________________________________ > >> > Linux-uvc-devel mailing list > >> > Linux-uvc-devel@lists.berlios.de > >> > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel > >> > > >> > > > > > > > _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
