video skips back when playing

[yanivf]

I’m a bit of a newbie, so I apologize if this has already been answered elsewhere.
Some of my playback files freeze, and the audio skips back a few seconds. I’ve tried playing the files through different players, and they all behave strangely, which led me to believe that the issue might be with the encoding itself. I noticed that FFmpeg was from 2023, so I updated it to the latest version.
I also wanted to tweak the TranscodeArgs since my hardware is fairly powerful (Core i9, RTX 4090, 128GB RAM), but I don’t think the settings are taking effect.

When I check the log (nrecord.log), the only parameters I see are as follows (i replaced the name of the show):
C:\Program Files\NextPVR\Other\ffmpeg.exe -re -y -i "M:\PLEX\_TV_\SomeTVShow_2025-04-04_22350030.ts" -vf fps=1/10,scale=220:124 -f mjpeg -flush_packets 1 "M:\PLEX\_TV_\SomeTVShow_2025-04-04_22350030.thumbnail"

here are the changes directly from the config.xml that I made -
<TranscodeHLS> 
  -y -v error -hwaccel cuda -hwaccel_output_format cuda -i [SOURCE] -f mpegts
  -c:v h264_nvenc -preset p5 -rc vbr -cq 19 -b:v [BITRATE] -maxrate [BITRATE] -bufsize 2M
  -c:a aac -b:a 128k -ar 48000 -ac 2 -s [RESOLUTION] -aspect [ASPECT] -g 60 -sc_threshold 0 [TARGET]
</TranscodeHLS>

<AnalyzeDuration>default</AnalyzeDuration>
<VideoEncoder>NVIDIA</VideoEncoder>
<TranscodeArgs>
  -y -v error -hwaccel cuda -hwaccel_output_format cuda -i [SOURCE] -f mpegts
  -c:v h264_nvenc -preset p5 -rc vbr -cq 19 -b:v [BITRATE] -maxrate [BITRATE] -bufsize 2M
  -c:a aac -b:a 128k -ar 48000 -ac 2 -s [RESOLUTION] -aspect [ASPECT] -g 60 -sc_threshold 0 [TARGET]
</TranscodeArgs>

[mvallevand]

Depending on the player NextPVR won't even use ffmpeg to transcode recordings unless you set "Recording Auto Transcode" The settings for those are hardcoded so they can't be changed. What you see in config.xml is for web player transcoding of Live TV and recordings on disk and even then if the source is IPTV typically they are just remuxed. I think there are some in config.xml that aren't even used.

That thumbnail file you show is for skipping in the NextPVR web player and UI clients and NextPVR.exe only. Often it helps for those clients but they can have problem with a bad source. If you don't used those clients you cant turn that off.

For a problem file it is best to upload it to an file share like GoggleDrive or OneDirve so we can look at it. You can also zip and upload the matching .timing file for an initial look.

Martin