Help. IPTV audio. 1ch works. 1ch doesn't. w/examples+logs

[snard]

Hi NextPVR.

I installed NextPVR on windows 10 for the first time the other day. I would want to use NPVR with a simple IPTV m3u playlist setup. For public channels only.

I had trouble with getting audio to work (no sound) on some of my channels. Read up the best I could and installed LAV. Set all decoder settings to LAV.
That helped. I now got sound on some channels, on others still don't.

To test this further and make it simpler, I made a playlist with 1 working channel and 1ch not working. 
See the enclosed playlist de-nextpvr.m3u. It contains:

Working. The "SR fernsehen" channel stream from playlist: https://srfs.akamaized.net/hls/live/6896...index.m3u8
Not working. The "HR fernsehen" channel stream from playlist: https://hrhls.akamaized.net/hls/live/202...index.m3u8

Test cases:
-----------

1.
Start the NextPVR Client windows program.
Start watching Live TV channel "SR fernsehen". VIDEO WORKS. AUDIO WORKS.
Exit the NextPVR Client windows program.
See enclosed log file: (SR Fernsehen HD).Watch-WITH-SOUND.NPVR.log.1.txt

2.
Start the NextPVR Client windows program.
Start watching Live TV channel "HR fernsehen". VIDEO WORKS. ***Audio DOES NOT WORK***.
Exit the NextPVR Client windows program.
See enclosed log file: (HR Fernsehen HD).Watch-WITHOUT-SOUND.NPVR.log.1.txt

All decoder settings set to LAV.

Would it be possible to get audio to work in example 2.
That's for the channel "HR fernsehen" channel stream from playlist: https://hrhls.akamaized.net/hls/live/202...index.m3u8





- mike
  NPVR-attachment.zip (Size: 4.93 KB / Downloads: 1)

[mvallevand]

I've seen those streams before and they are interesting playlists because of their 2 use of catchup TV. In NextPVR I have always been curious can you tell me if they play at the current time or two hours in the past?

In any case these URLs are sent to ffmpeg for capture because NextPVR doesn't natively support separate audio and video streams. NextPVR is requesting an audio stream -map 0:a:0 that doesn't exist. It is actually difficult to get ffmpeg to detect the correct stream automatically on that complex m3u8.

You could do it with extra if need be since it allows you to pick the streams yourself.

Code:

<extras>
  <channel name="HR fernsehen">
    <command>ffmpeg.exe</command>
    <args>-v panic -i https://hrhls.akamaized.net/hls/live/2024525-b/hrhls/master-1080p-5000.m3u8 -i https://hrhls.akamaized.net/hls/live/2024525/hrhls/master-audio1-1328.m3u8  -codec copy -f mpegts -</args>
  </channel>
</extras>

Martin

[snard]

In any case these URLs are sent to ffmpeg for capture because NextPVR doesn't natively support separate audio and video streams. NextPVR is requesting an audio stream -map 0:a:0 that doesn't exist. It is actually difficult to get ffmpeg to detect the correct stream automatically on that complex m3u8.

Aha, that's what's going on. This IPTV world of possibilities is new land for me. Thanks for the explanation.

You could do it with extra if need be since it allows you to pick the streams yourself.

Ok, I understand. I just skimmed the extra option in the wiki. I will spend some time reading up on the extra option and try using it in the future. Also for the other channels I am having problems with. Will try to follow the procedure you suggest.

Thanks for the help.

-mike

[mvallevand]

You can multiple channels in one extra too. It might be better to pass everything to a batch file since NextPVR does not update extras on a rescan which could be necessary if the CDN address changes.

Did you see my question on whether these channels start live in the past?

Martin

[snard]

Super, I got it to work perfectly with the 'extra'. I'll not be refining this Windows setup.
I'm very satisfied with the results as it is now. 

Did you see my question on whether these channels start live in the past?

I'm not sure I understand the question. Can you elaborate with an example? I'll try and answer that question.

Apart from that, I'll now withdraw from posting to this forum, as I have other projects needing attention.

Thanks again. Much appreciated.

[mvallevand]

Glad to hear an extra can help.

My question is based on the playlist. If you check one those URL's you put in the extra with curl you will see they include 3600 twoi second mpeg-ts segments. It is normal to have a few to allow buffering etc and NextPVR will typically discard a few but there are 2 hours there that allow catchup. I was wondering where ffmpeg was starting you, with the current show or two hours in the past.

Martin

[snard]

I was wondering where ffmpeg was starting you, with the current show or two hours in the past

Ok. Just checked. ffmpeg starts with the current show. I'll be off the thread.