[mythtv-users] HDHomerun recordings look really bad

Stephen Worthington stephen_agent at jsw.gen.nz
Mon Dec 18 08:46:57 UTC 2023

On Sun, 17 Dec 2023 17:37:17 -0800, you wrote:

>Hi all, so I've been a mythtv-users since forever. The defaults were
>working for me for the longest time. However, recently, I've noticed the
>recording of broadcast HD channels like the NFL games are horrible. The
>colors look really bad and the compression is bad. I am wondering if
>someone can help me find the settings to tweak to get the recording quality
>better. I don't even know where/what to start checking since everything is
>just the default and I've never touched it. I think they are just MPEG2
>recordings and not transcoded (i think?).
>More info:
>   1. A plex server using the HDhomerun turner, and also playback on a plex
>   client, they look really good compared to mythtv.
>   2. Playback using the recorded files from the mythtv-backend using kodi
>   client looks just as bad as the mythtv-frontend, so I am suspecting the
>   actual recordings are bad.
>   3. This isn't a reception issue, as there are no artifacts on the
>   recordings caused by tuning issues.
>   4. This looks like a "compression" issue or the capture is lower
>   resolution including the colors are lower bit-depth. for colors you can see
>   the actual gradient like if it was only 256 colors (this is an
>   exaggeration). For fast moving scenes, they look blocky.
>   5. Playback looks bad on most clients, even wired-network clients.
>Not sure what to check first, so any help will be appreciated, thanks all.
>I was hoping the answer would be to check the HDHomerun capture quality
>setting somewhere :)

This is with an HDHomeRun ATSC 1.0 tuner, correct?  If so, then there
is no compression done in the recording process.  It is a digital
tuner, so what is transmitted is what gets recorded.  It is possible
that you have programmed it to do a post-record transcoding to a lower
quality format, but there would have been no reason for you to do

To find out the format of the recording file, in the mythfrontend
recordings list, use the I key twice and it should show the name and
location of the recording file.  Find that name on disk and use a
program like mediainfo (or ffprobe or mythffprobe) to tell you what
format is in it.

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