Duncan Webb wrote: > Hi all, > > I've been noticing some quality issues with ivtv over the last months or > so and am wondering if anybody else has the same issues. > > I have two types of Hauppauge PVR cards, a 350 and a 500. both running > ivtv-0.10.1 > > ivtv0: Encoder revision: 0x02060039 > ivtv0: Decoder revision: 0x02020023 > > The PVR-350 is very jerky but the picture is quite sharp, at least as > sharp as the TV.
Thanks to one of the Freevo users who spotted the problem. The video_aspect and the video_b_frames start at 1 less than with the drivers before 0.8.0. This means that the video_aspect was being set to 16x9 instead of 4x3 and the b-frames was being set to 3 instead of 2. However having said the above I don't quite understand why the aspect being set to 16x9 and the b-frames being set to 3 in a video_gop_size of 12 should make the mpeg stream jerky. This leads to the question, what does the video_aspect control setting actually do? One other observation is that the default Video standard is now 0x0000000f whereas it was 0x000000ff. Will this have an effect on the quality? I've not yet had time to see if the default setting make a difference with the quality of the picture on the PVR-500. TIA Duncan > > The PVR-500 has a smooth image but the picture is not sharp. > > The signal strength is good > > PVR-350 # v4l2-ctl -T > Tuner: > Capabilities : 62.5 kHz multi-standard stereo lang1 lang2 > Frequency range : 44.0 MHz - 958.0 MHz > Signal strength : 99% > Current audio mode : stereo > Available subchannels: stereo > > The PVR-500 has a smooth image but the picture is not sharp. > > PVR-500 # v4l2-ctl -T > Tuner: > Capabilities : 62.5 kHz multi-standard stereo lang1 lang2 > Frequency range : 44.0 MHz - 958.0 MHz > Signal strength : 100% > Current audio mode : lang1 > Available subchannels: stereo > > The attached images show, quite clearly with the white jumper the > difference in image quality. _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
