Matroska recordings seem broken

mtrsk

Hello,

I am using tvheadend 4.3-2209_gb225e4d6c running in a docker container.
When using the DVR feature, I usually use the default recording profile, which works great.
As I would like to jump back and forwards in my recordings, I read that I would need to switch to matroska. But sadly that seems to break my recordings.

Even though the UI shows, that no errors during the recording occured, trying to replay the recording through TVHeadend-Stream, as well as by opening the file directly in VLC, causes the playback to get stuck aufter a few seconds.

I opened the VLC messages during playback and got spammed with:
"Timestamp conversion failed (delay 1000000, buffering 4500, bound 3000000)
Could not convert timestamp 2153299294000 for mpg123
Timestamp conversion failed (delay 1000000, buffering 4500, bound 3000000)
Could not convert timestamp 2153299518000 for mpg123
Timestamp conversion failed (delay 1000000, buffering 4500, bound 3000000)
Could not convert timestamp 2153299542000 for mpg123
..."

As I don't have those issues when using the default recording profile, I assume, that the source signal is actually fine, but something with ffmpeg/matroska is causing issues.

Does anyone ever experience this / is there anything I can double-check or verify?

Thanks a lot

joe blow

I just recorded a program using:
HTS Tvheadend 4.3₂₁₂₀.g18effa8ad-dmo1, installed Debian 11 Bookworm with mkv selected as output.
No issues with playback of the mkv, FF/RW works as expected in both kodi and vlc.
You don't say how you are watching, what interface.
My recording is done via Vero V, OSMC and the recording is set via GUI in TVH
There are two recording, when set as above, one is the native .TS the other is .MKV, viewing the .TS in Kodi, I'm able to FF/RW.

mtrsk

Hey, thanks a lot for the reply.

How did you select mkv as output? I don't fully understand all options about the streaming&recording profiles, so I took screenshots:

My matroska recording profile:

My matroska streaming profile:

How I do my recordings: I just click the record button in the TVheadend web-UI (and select matroska as recording profile)
How I am watching: I tried three things ways, that all result in the same behaviour: 1) using the integrated VLC of the tvheadend iPhone app 2) Downloading the m3u8 from the TVheadend-UI and opening that with VLC. 3) Navigating a filemanager to the actual recording file in the filesystem and open that file directly with VLC.
All show the same results.

My recording is done via Vero V, OSMC

Where do you configure that?

There are two recording, when set as above

Sorry for my maybe stupid questions, but: is the TS recording then also in a matroska container? I guess so, as otherwise FF/RW would not work? And: Does MKV mean, that you are actually transcoding while recording?

As far as I understand my settings, I am not transcoding audio/video, but rather take the "raw" stream and just wrap a matroska container around it.

joe blow

Have you tried recording in htsp format, and if so, are you able to FF/RW?
I suspect there is reading in future regarding .ts/.mkv and containers in general.

mtrsk

Hey Joe,

in my recording profile I tried selecting "htsp" as the streaming profile, but every time I click "Save", it then jumps to "pass".
So I guess I can't even test the htsp format.
I also don't see any logs in neither the tvheadend browser, nor in the logfile of tvheadend regarding this change.

joe blow

Well its docker, to change anything, you need to stop the container, edit what you need, restart the container

mtrsk

I dont think that this is a docker issue, as I can perfectly switch between "pass" and "matroska" without any restarts. In the end, also tvheadend in the docker container is just persisting to a config file.