[mythtv-users] new PC build that's MythTV compatible

[Stuart Auchterlonie]

On 02/12/2020 00:00, James Linder wrote:
> 
> 
>> On 2 Dec 2020, at 12:06 am, Will Dormann <wdormann at gmail.com> wrote:
>>
>> On 12/1/20 6:45 AM, James Linder wrote:
>>> Owen thanks very much.
>>> These are two screen shots on a macbook retina display (2650x1650) ish
>>> They look similar on intel-1080 monitor. I'll examin a real TV now.
>>> They are ABC SD and HD. My critical look is at the text, but scene changes do not make much difference.
>>> http://tigger.ws/downloads/twoSD.png
>>> http://tigger.ws/downloads/twoHD.png
>>
>>
>> For an HD recording, the quality of the latter is quite poor.  My hunch is that it's 480p instead of HD (or whatever the p equivalent of the SD signal in your region is).
>>
>> To eliminate some variables, try running "ffprobe" on some recordings.  For example, here are a couple from my system:
>>
>> Input #0, mpegts, from '2511_20201201120000.ts':
>>   Duration: 01:00:30.42, start: 48950.153256, bitrate: 13824 kb/s
>>   Program 1
>>     Stream #0:0[0x641]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, max. 79975 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>>     Stream #0:1[0x642](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
>>     Stream #0:2[0x643](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s
>>
>>
>> Input #0, mpegts, from '2235_20201112050000.ts':
>>   Duration: 01:22:29.28, start: 46678.077111, bitrate: 3161 kb/s
>>   Program 1
>>     Stream #0:0[0xb0f]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, smpte170m), 720x480 [SAR 8:9 DAR 4:3], Closed Captions, max. 7500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>>     Stream #0:1[0xb10](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
>>     Stream #0:2[0xb11](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 96 kb/s
>>     Stream #0:3[0xb12]: Unknown: none ([134][0][0][0] / 0x0086)
>> Unsupported codec with id 0 for input stream 3
>>
>>
>>
>> The first is HD, as indicated by the "1920x1080"
>> The second is considered SD, with a resolution of 720x480.
>>
>>
>> What is the resolution of the recording for what you used for the "twoHD.png" screenshot?
> 
> I have not kept THOSE in HD as cutlist editing h264 is more of a pain, but here are two. That Doc Martin was probed too and was 1080P25
> I asked about transmitters in perth, but I'll look at 'real TV' to see a difference. I can't believe that the 1/2 dozen frontends that I've put together, mostly various NUCs and macs, ALL have a resolution issue.
> 
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/store/Movies/Myth-K/Kingsman: The Secret Service.mp4':
>    Metadata:
>      major_brand     : isom
>      minor_version   : 512
>      compatible_brands: isomiso2avc1mp41
>      encoder         : Lavf58.29.100
>    Duration: 01:55:53.12, start: 0.000000, bitrate: 3127 kb/s
>      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], 2738 kb/s, 24.98 fps, 25 tbr, 90k tbn, 50 tbc (default)
>      Metadata:
>        handler_name    : VideoHandler
>      Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 384 kb/s (default)
>      Metadata:
>        handler_name    : SoundHandler
>      Side data:
>        audio service type: main
> 
> 
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/store/Movies/Myth-B/Barack Obama:The Interview.mp4':
>    Metadata:
>      major_brand     : isom
>      minor_version   : 512
>      compatible_brands: isomiso2avc1mp41
>      encoder         : Lavf58.29.100
>    Duration: 00:37:47.10, start: 0.000000, bitrate: 4413 kb/s
>      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4023 kb/s, 49.90 fps, 50 tbr, 90k tbn, 50 tbc (default)
>      Metadata:
>        handler_name    : VideoHandler
>      Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
>      Metadata:
>        handler_name    : SoundHandler
>      Side data:
>        audio service type: main
> 
> As an a/b test is anybody able to post a decent quality HD recording somewhere that I can grab from?
> 

Take your pick https://jell.yfish.us/
depending on what you have hardware support for :)


Regards
Stuart