[mythtv-users] Recorded wrong channel

Will Dormann wdormann at gmail.com
Thu Mar 25 02:29:08 UTC 2021

On 3/22/21 10:40 PM, DryHeat122 wrote:
> I prepared to enjoy last night's episode of Last Week Tonight showing up 
> in my watch recordings list.  Info shows it was recorded from HBO via my 
> When I play it, the recording is of Masterpiece on PBS, which could be 
> either from the HDPVR or a HDHomerun.

The HD-PVR is a device that will record component video from some 
external source.  It will record the video that is output from some 
other TV-providing source, like a cable box.

If you have questions about what device the recording came from, you can 
run ffprobe on the .ts file for the recording.  If it's from the HD-PVR, 
it'll show up as H264 video.   e.g.:
Stream #0:0[0x1011]: Video: h264 (Main) (HDMV / 0x564D4448), yuv420p(tv, 
bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr, 
90k tbn, 59.94 tbc

If it's from a HDHomerun, in most cases it'll be an MPEG2 file.  e.g.:
Stream #0:0[0x641]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), 
yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], Closed 
Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

Now, let's say that you've confirmed that it did indeed come from your 
HD-PVR.  Your goal now would be to figure out why your channel changer 
didn't work.

Depending on what you're recording from, you may have one of a number of 
mechanisms set up to perform the channel changing.  My cable box is 
controlled via firewire.  My older one was a DB-9 serial port.  Some 
folks may go the IR-blaster route.  Either controlled by a serial port 
from their computer, or perhaps a blaster connected to the HD-PVR if you 
got that working.

There are a lot of moving parts here.  And depending on what mechanism 
you're using, there are a number of ways that your channel may have 
failed to change.   But given the amount of information provided above, 
it'll be on you to figure out what may have went wrong.


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