[mythtv-users] PVR500 poor picture quality

[Bloke DownThePub]

I've set it to tha appropriate standard for Belgium - PAL-B/B1/G but the
quality's quite poor.

Here are a few short samples.

http://www.youtube.com/watch?v=GBuLCKgn8f8

http://www.youtube.com/watch?v=DgvcxxiR96E

http://www.youtube.com/watch?v=B7Kq3WpMogM

The upload process seems accurate, the clips look pretty much the same as
when I look at them in mplayer or download them to a pc and use media player
classic.

I've noticed the image degrades if I split the output between the PVR and a
TV, but before I run out and buy a signal booster, could it be something
else?  Of course I'm a lucky guy, it could be both...

There are numerous settings in v4l2-ctl that I don't really understand:

v4l2-ctl -d 1 -l

User Controls

                     brightness (int)  : min=0 max=255 step=1 default=128
value=128 flags=slider
                       contrast (int)  : min=0 max=127 step=1 default=64
value=64 flags=slider
                     saturation (int)  : min=0 max=127 step=1 default=64
value=64 flags=slider
                            hue (int)  : min=-128 max=127 step=1 default=0
value=0 flags=slider
                         volume (int)  : min=0 max=65535 step=655
default=60928 value=60928 flags=slider
                        balance (int)  : min=0 max=65535 step=655
default=32768 value=32768 flags=slider
                           bass (int)  : min=0 max=65535 step=655
default=32768 value=32768 flags=slider
                         treble (int)  : min=0 max=65535 step=655
default=32768 value=32768 flags=slider
                           mute (bool) : default=0 value=0

MPEG Encoder Controls

                    stream_type (menu) : min=0 max=5 default=0 value=0
flags=update
              stream_vbi_format (menu) : min=0 max=1 default=0 value=0
       audio_sampling_frequency (menu) : min=0 max=2 default=1 value=1
                 audio_encoding (menu) : min=1 max=1 default=1 value=1
flags=update
         audio_layer_ii_bitrate (menu) : min=9 max=13 default=10 value=10
              audio_stereo_mode (menu) : min=0 max=3 default=0 value=0
flags=update
    audio_stereo_mode_extension (menu) : min=0 max=3 default=0 value=0
flags=inactive
                 audio_emphasis (menu) : min=0 max=2 default=0 value=0
                      audio_crc (menu) : min=0 max=1 default=0 value=0
                     audio_mute (bool) : default=0 value=0
                 video_encoding (menu) : min=0 max=1 default=1 value=1
flags=readonly
                   video_aspect (menu) : min=0 max=3 default=1 value=1
                 video_b_frames (int)  : min=0 max=33 step=1 default=2
value=2 flags=update
                 video_gop_size (int)  : min=1 max=34 step=1 default=12
value=12
              video_gop_closure (bool) : default=1 value=1
             video_bitrate_mode (menu) : min=0 max=1 default=0 value=0
flags=update
                  video_bitrate (int)  : min=0 max=27000000 step=1
default=6000000 value=6000000
             video_peak_bitrate (int)  : min=0 max=27000000 step=1
default=8000000 value=8000000
      video_temporal_decimation (int)  : min=0 max=255 step=1 default=0
value=0
                     video_mute (bool) : default=0 value=0
                 video_mute_yuv (int)  : min=0 max=16777215 step=1
default=32896 value=32896
            spatial_filter_mode (menu) : min=0 max=1 default=0 value=0
flags=update
                 spatial_filter (int)  : min=0 max=15 step=1 default=0
value=0 flags=slider
       spatial_luma_filter_type (menu) : min=0 max=4 default=1 value=1
     spatial_chroma_filter_type (menu) : min=0 max=1 default=1 value=1
           temporal_filter_mode (menu) : min=0 max=1 default=0 value=0
flags=update
                temporal_filter (int)  : min=0 max=31 step=1 default=8
value=8 flags=slider
             median_filter_type (menu) : min=0 max=4 default=0 value=0
flags=update
     median_luma_filter_minimum (int)  : min=0 max=255 step=1 default=0
value=0 flags=inactive slider
     median_luma_filter_maximum (int)  : min=0 max=255 step=1 default=255
value=255 flags=inactive slider
   median_chroma_filter_minimum (int)  : min=0 max=255 step=1 default=0
value=0 flags=inactive slider
   median_chroma_filter_maximum (int)  : min=0 max=255 step=1 default=255
value=255 flags=inactive slider
      insert_navigation_packets (bool) : default=0 value=0

Anybody have ideas for what I should adjust?  Is there anywhere an
explanation of these terms?
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