<div dir="ltr">I do know that the signal strength dropped from 92% to 87% when it hit QAM-256 channel 115 in the scan, then went back up on the next channel. When I actually tune to the channel in Live TV mode, it shows a signal strength of 91%.<div><br></div><div>mythffmpeg reports the following:</div><div><br></div><div><div># mythffmpeg -i hd_test_1.dat</div><div>ffmpeg version 1.2.7 Copyright (c) 2000-2014 the FFmpeg developers</div><div> built on Feb 2 2016 10:27:10 with gcc 4.9.2 (Debian 4.9.2-10)</div><div> configuration: --prefix=/usr/local/mythtv-0.27-2255patch</div><div> libavutil 52. 18.100 / 52. 18.100</div><div> libavcodec 54. 92.100 / 54. 92.100</div><div> libavformat 54. 63.104 / 54. 63.104</div><div> libavdevice 54. 3.103 / 54. 3.103</div><div> libavfilter 3. 42.103 / 3. 42.103</div><div> libswscale 2. 2.100 / 2. 2.100</div><div> libswresample 0. 17.102 / 0. 17.102</div><div> libpostproc 52. 2.100 / 52. 2.100</div><div>[mpeg2video @ 0x1372000] 0x0 is invalid</div><div> Last message repeated 9 times</div><div>[mpegts @ 0x136fa20] Stream #0: not enough frames to estimate rate; consider increasing probesize</div><div>[mpegts @ 0x136fa20] PES packet size mismatch</div><div>Input #0, mpegts, from 'hd_test_1.dat':</div><div> Duration: 00:00:37.09, start: 13266.651322, bitrate: 15013 kb/s</div><div>Codec 0x20000 is not in the full list.</div><div> Stream #0:0[0x0]: Data: unknown_codec, 18399 kb/s</div><div> Stream #0:1[0x6f]: Video: mpeg2video (Main), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc</div><div> Stream #0:2[0x70]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s</div><div>At least one output file must be specified</div></div><div><br></div><div>And I got an error when I tried to run a conversion:</div><div><br></div><div><div># mythffmpeg hd_test_1.dat</div><div>ffmpeg version 1.2.7 Copyright (c) 2000-2014 the FFmpeg developers</div><div> built on Feb 2 2016 10:27:10 with gcc 4.9.2 (Debian 4.9.2-10)</div><div> configuration: --prefix=/usr/local/mythtv-0.27-2255patch</div><div> libavutil 52. 18.100 / 52. 18.100</div><div> libavcodec 54. 92.100 / 54. 92.100</div><div> libavformat 54. 63.104 / 54. 63.104</div><div> libavdevice 54. 3.103 / 54. 3.103</div><div> libavfilter 3. 42.103 / 3. 42.103</div><div> libswscale 2. 2.100 / 2. 2.100</div><div> libswresample 0. 17.102 / 0. 17.102</div><div> libpostproc 52. 2.100 / 52. 2.100</div><div>[NULL @ 0x2285a20] Unable to find a suitable output format for 'hd_test_1.dat'</div><div>hd_test_1.dat: Invalid argument</div></div><div><br></div><div> - Dave</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 4, 2016 at 3:21 PM, John Pilkington <span dir="ltr"><<a href="mailto:J.Pilk@tesco.net" target="_blank">J.Pilk@tesco.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 04/02/16 19:24, David Parker wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks for all the help so far.<br>
<br>
I now have the channel set up in MythTV and can see it, but there's a<br>
new wrinkle. The stream from this channel (and only this channel) seems<br>
unstable, at least in MythTV. In both recordings and live TV, the video<br>
shakes slightly and the sound stutters. The weird thing is, this<br>
doesn't happen when I capture the raw stream and view in in mplayer:<br>
<br>
$ dvbv5-zap -c dvb_channel.conf -v -r "WFXV HD"<br>
$ cat /dev/dvb/adapter0/dvr0 > hd_test_1.dat<br>
<br>
Viewing hd_test_1.dat in mplayer shows the video and audio are fine.<br>
This issue seems to be isolated to MythTV, and/or the MPEG-2 compression<br>
of the stream. But it doesn't happen on any other channels. Is there<br>
something I'm missing here?<br>
<br>
Thanks!<br>
<br>
</blockquote>
<br></span>
Perhaps myth is having to process other streams, like subtitles, or processing other stuff? Do you have any indication of signal strengths for all the channels you see?<br>
<br>
'mythffmpeg -i hd_test_1.dat' might help - and allow comparison with other channels. You can also display some diagnostics via<br>
Menu > Playback > Playback Data<div class="HOEnZb"><div class="h5"><br>
<br>
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</div></div></blockquote></div><br></div>