transcode tvh pass stream

[goerdi]

Hi !

During my Test with transcode i found out that if i force live tv transcode
it worked e.g. when input codec was vp8 but when i set tvheadend to "pass" (which makes mor sense because  tbh is on localhost) it does not work.
please check attached logile ...

i tried also hevc as input codec and it works.... but instead of transcode it to AV1 it flips it back to x264

tream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_qsv))
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))

Ciao Gerd

[attachment=6293]

[TheDreadPirate]

What do you mean "it does not work" when you set TVH to pass through the original video? It doesn't play on the clients? What kind of clients are they?

[goerdi]

Hi !

Exactly , if i choose pass in tvheadend then i stay with the black screen... if i set it up in tvh to transcode to x264 via vaapi it works...

Ciao Gerd

[TheDreadPirate]

Can you re-attach the log from the opening post? It didn't actually attach.

When you set the input to pass through, do the clients try to direct play it? Or does it try to transcode?

[goerdi]

Hi !

Sure.. this is a similar logfile of an IPTV source which provides via hevc and jellyfin transcodes its back to x264 (transcoding for live tv is enabled)

Ciao Gerd


  FFmpeg.zip (Size: 4.05 KB / Downloads: 105)

[TheDreadPirate]

I'm not familiar with the details of how TVHeadend works.

So the video source is natively VP8. You are having TVH convert it to HEVC BEFORE sending to Jellyfin which then converts it to H264 for your, I'm assuming, browser client. If you DON'T have TVH convert to HEVC before sending to Jellyfin, it fails.

Is that correct?

If that is correct, can you share screenshots of Dashboard > Playback > Transcoding?

Do you have VP8 checked? If you do, uncheck it. VP8 decoding is not support for Arc GPUs. Unchecking it would have the CPU decode the video before sending to the GPU for encoding.

[goerdi]

Hi !

Ths is not like TVH works VP8 transcoding is only on the GUI when you play "default"
the "pass" profile is the default profile (standart) .. which if you have configured an anonymous user is the default profile .. and this is default also x264
so tvh in default operation is sending a h264 stream
only if you select another profile as default then its gets it e.g. with the codec of this profile.
BTW: meanwhile i switched to m3u from tvh because it seems that plugin connetion has some "problems" (like long starting time) which m3u does not have..

Ciao Gerd

Ciao Gerd

[goerdi]

here is a nice example which i do not understand why jellyfin is transcoding
the stream is delivers as hvec but jellyfin transcode it back to h264...
so it make the stream bigger that it was originally..

This was the try to start on a Laptop with win10 (i5 8th generation) in firefox and edge
In edge was the reason for transcode like "error at start of direct play"


Ciao Gerd

   

[TheDreadPirate]

Did you install the HEVC decoder from the Microsoft store. For HEVC playback to work in Edge you need to have the OS level HEVC decoder installed.

---

Apparently the "HEVC video extension" is no longer free?

[goerdi]

I installed it in win11 but its still the same.... but also same scenario in FF with ubuntu (where jellyfin server runs.. so i assume that driveres are installed at least in linux.
If i start the HEVC Stream in VLC it shows me that its running, and cpu usage in taskmaner for VLC is nearly is aroun 1-2%
(see atached pictures)

Ciao Gerd