Hey Guys, I have an interesting problem that I can't seem to resolve. Hopefully someone here has the answer.

I have setup mythtv to the point that I can watch live tv when I do not specify an external channel change script in mythtv-setup and I change the tuner to channel 3. I then can use my channel change script via command line to change channels on my external cable box (via IRblaster).

So I know everything works... but when I go in to specify an external channel change script via mythtv-setup and preset the tuner to channel 3, I get nothing but snow/fuzz on the screen. I know it is using the channel change script because when I try to change channels, my IRblaster blinks.....

I am using the latest knoppmyth version, a PVR-250 w/ IR receiver, external cable box, IRblaster.

Let me know if any logs would be helpful.... But I have a feeling it is some stupidly simple setting that I am just missing

Are you capturing through the Tuner on your PVR250 or the Composite/S-Video input?
In the Channel Editor, on the second screen for each channel (the one where all the sliders are) did you put in the text field, the digits that you send to the STB, for instance if you normally press 101 on your STB remote, that's the value you put in this field for that channel?
It might be worthwhile having a look at your /var/log/myth/mythbackend file, as this may give a clue to your problem.

Bruce S.

_________________
Updated 2019/10/26: AthlonII X2 265 Gigabyte GA-970A-DS3P
16Gb PC 1866 DDR3, 500GB+2TB+4TB SATA HDD,
SATA DVD-RW Asus DRW-24D5MT , NVIDIA GeForce GT1080
Hauppauage Nova-T 500, Nova-T LinHes R8.6.1

1> I am capturing through the tuner and not through the composite or S-video.

2> I looked in the channel editor (I haven't touched anything here since install) and it appears that some of the channels have the channel number in the frequency/channel field but some do not. For instance, ch 413 has "413" in this field but ch 14 has "121250" in this field......

3> I took a quick look at my mythbackend.log file and I noticed that it was trying to send the wrong digits when changing channels (1404 instead of 404, etc). I also saw some codec error....



4> I also had another question... in mythtv-setup under "Inputs" where you specify an external channel change command, I have read that the command needs to be in quotes.. is this true? (I have tried both with and without quotes and get the same results)

Thanks!!!

Are you trying to to tune into the analogue channels as well over the same input? If this channel is from your STB, then it will have to be the digits that you would send to the STB using your remote.

You need to the 3rd page of the R5E50 Upgrade Hints and Hazards and replace your set_ivtv_params with the script provided by tjc.

I've never used quotes for it, the only way I would see you would need quotes is that the command itself contained a space.

Bruce S.

_________________
Updated 2019/10/26: AthlonII X2 265 Gigabyte GA-970A-DS3P
16Gb PC 1866 DDR3, 500GB+2TB+4TB SATA HDD,
SATA DVD-RW Asus DRW-24D5MT , NVIDIA GeForce GT1080
Hauppauage Nova-T 500, Nova-T LinHes R8.6.1

It sounds to me like you may have two issues. One your channel change script and two your channel list.

You need to verify that you are using the correct channel change script for your cable box.

You may be running into this issue also:

http://www.mysettopbox.tv/phpBB2/viewto ... highlight=

http://mysettopbox.tv/phpBB2/viewtopic. ... hange+snow

This will drive you absolutely mad until you fix it. I had the same problem with tuning until I got this fixed.

Once you know that the channel change script is correct and the tuner knows to start on 3, you should be able to change to whatever channel from the keyboard. If not then you may need to revisit your zap2it lineup and make sure that it is correct. You may also have to delete and re-import your channel lineup.

I suspect the main issue is the starting channel for the tuner which is covered in the above posts.

Thanks grg3, that thread describes exactly what is happening to me. I will try to do as they suggest in that thread when I get home and I can play with it.

Thanks again!!!