[mythtv-users] Recording from input video on demand, no tuner; update: troubles capturing video using RPI4

Jay Harbeston jharbestonus at gmail.com
Tue Feb 28 19:39:03 UTC 2023

>> I don't know if it will help you, but as of Mythtv v33, the mythexternrecorder application now lets you set "per channel" tuning command. See:
>> https://www.mythtv.org/wiki/Example_Configuration_files#Mythtv_v33_Example
>> That means your tuning command could be a no-op for specific channels that you have defined.
>> John

So I have been ‘experimenting’ with this and I think I have set up something incorrect for incoming video. 

The hdmi device is usb, one of those that are 10-20 bucks, and from what I can tell it is creating a v4l2 mjpeg video stream with a PCM audio stream on  USB audio. 

Using ffmpeg, I can create an avi with it, and also an mkv with it , and have tried multiple ways to create an output stream for mythtv to use.

I am trying to keep processing down to a minimal amount since I am trying to use a Raspberry Pi 4b with 4GB ram running mythbackend to capture the video stream.

If I try to use any mpeg2 or mp4 transcoding, I get in trouble with using too much cpu. Any ideas as to what I can try to capture with little or no transcoding effort on the RPI 4b? Or am I asking too much from the RPI4 to capture it.


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