[mythtv-users] specific channel seek issue and acts like poor signal

John jksjdevelop at gmail.com
Sun Apr 14 16:37:03 UTC 2019


On 13/04/2019 14:39, Tim Draper wrote:
>
>
>   ---- On Fri, 12 Apr 2019 18:58:40 +0100 jksjdevelop <jksjdevelop at gmail.com> wrote ----
>
>   >         Just tested. No seeking or playback issues with myth30 using    MPEG-2ffmpeg playback. Recommend checking the tuning parameters    against https://en.kingofsat.net/freqs.php?&pos=28.2E&standard=All&ordre=freq&filtre=Clear.
>
> testing on laptop with mythfrontend livetv using VAAPI Normal/VAAPI2 Normal profiles - i have the "poor signal" issue, with VAAPI2 being the worst.
> 'normal' playback profile and it works fine.
> I haven't tested the seek issue yet.
>
> thanks for link, very useful and i've updated my schedule lineup using the SID values to match. years of using one of the wiki methods has left a lot of old/invalid data as i've moved between various guide sources and been lax with keeping ontop of changes, SID matching should be far easier.
>
> i do find it a bit weird 4seven is the only channel exhibiting the issue, but hey ho.
> What now, based on the fact the issue seems to be on the chosen playback profile?
>
>
>
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Just re-tested can confirm that 4seven (from Freesat_) plays with 
extreme blockiness after seek when using VAAPI 2 profile. One would 
expect the same effect from More 4 (a similar SD Mpeg2 encoded channel) 
but this is not the case, the latter plays perfectly. Both VAAPI 1 and 
OpenGL HQ playback seem fine for both.

Working SD mpeg2 broadcast, channel More 4

Input #0, mpegts, from '/media/library/TV/9340_20190411200000.ts':
   Duration: 01:19:57.64, start: 76503.229767, bitrate: 2568 kb/s
   Program 1
     Stream #0:0[0x937]: Video: mpeg2video (Main) ([2][0][0][0] / 
0x0002), yuv420p(tv, top first), 704x576 [SAR 16:11 DAR 16:9], 25 fps, 
25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x939](NAR): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 
Hz, stereo, s16p, 128 kb/s
     Stream #0:2[0x938](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 
Hz, stereo, s16p, 192 kb/s
     Stream #0:3[0x93b](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
     Stream #0:4[0x93a](eng,eng): Subtitle: dvb_teletext ([6][0][0][0] / 
0x0006), 492x250
     Stream #0:5[0xf04]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:6[0xf03]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:7[0xf02]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:8[0xf01]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:9[0xf00]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:10[0x936]: Unknown: none ([5][0][0][0] / 0x0005)

None working channel 4seven

Input #0, mpegts, from '/media/library/TV/livetv/22250_20190412173048.ts':
   Duration: 00:34:12.32, start: 53768.176733, bitrate: 3886 kb/s
   Program 1
     Stream #0:0[0x90c]: Video: mpeg2video (Main) ([2][0][0][0] / 
0x0002), yuv420p(tv, bottom first), 704x576 [SAR 16:11 DAR 16:9], 25 
fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x90f](NAR): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 
Hz, stereo, s16p, 128 kb/s (clean effects)
     Stream #0:2[0x90d](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 
Hz, stereo, s16p, 192 kb/s
     Stream #0:3[0x910](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
     Stream #0:4[0x90e](eng,eng): Subtitle: dvb_teletext ([6][0][0][0] / 
0x0006), 492x250
     Stream #0:5[0xf04]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:6[0xf03]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:7[0xf02]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:8[0xf01]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:9[0xf00]: Unknown: none ([5][0][0][0] / 0x0005)
     Stream #0:10[0x911]: Unknown: none ([5][0][0][0] / 0x0005)





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