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

[Stephen Worthington]

On Sun, 14 Apr 2019 17:37:03 +0100, you wrote:

>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)

One obvious difference between those two channels is that, while they
are both interlaced, the non-working one is bottom field first, and
the working one is top field first.