Getting an error while trying to use mkv export in C++

[apokerce]

Hi I have write a streamer in C++ using Valkka's functionality but when I tried to export the dump files to mkv I am getting error shown in 1. The reason I am trying to use valkka in C++ because most of the code is in C++. Thank you in advance.

1. Terminal Output

   0 : 1673007524595 1673007525428
   1 : 1673007525845 1673007526678
   2 : 1673007527095 1673007527928
   3 : 1673007528344 1673007529178
   4 : 1673007529594 1673007530428
   5 : 1673007530845 1673007531553
   6 : -
   7 : 1673007520845 1673007521678
   8 : 1673007522095 1673007522929
   9 : 1673007523345 1673007524179
   ValkkaFSReaderThread: reportSlotId:
   ValkkaFSReaderThread: reportSlotId: 925412 --> 1
   [NULL @ 0x7f57f00102a0] Requested output format 'matroska' is not a suitable output format
   FileFrameFilter : initFile : FATAL : could not create output context!  Have you enabled matroska and registered all codecs and muxers?

2. NVIDIA

3. RTSP Camera

4. DISTRIB_ID=Ubuntu
   DISTRIB_RELEASE=20.04
   DISTRIB_CODENAME=focal
   DISTRIB_DESCRIPTION="Ubuntu 20.04.3 LTS"
   Arch=x86_64

5. Compiled using Cmake

6. 
   branch 1
                                                     ------>    {RGBShmemFrameFilter: shmem_filter) --> {SwsScaleFrameFilter:sws_scale_filter} --> {TimeIntervalFrameFilter:interval} --> {AVThread:avthread} 

main branch		(LiveThread:livethread) --> {ForkFrameFilter:live_out_filter} -->

                                                               +-------------> {ValkkaFSWriterThread: writer}

9.
[valkkafscpp.txt](https://github.com/elsampsa/valkka-core/files/10361051/valkkafscpp.txt)
[savetomkvcpp.txt](https://github.com/elsampsa/valkka-core/files/10361075/savetomkvcpp.txt)

[elsampsa]

Did you forget this?

https://github.com/elsampsa/valkka-core/blob/master/test/mux_test.cpp#L129

[apokerce]

I added ffmpeg_av_log_set_level(0); fatal_log_all(); Did not work after I added this too but still no luck; ffmpeg_av_register_all(); // never forget!

[elsampsa]

you added "ffmpeg_av_register_all()" in the very begining of your program? plz upload the full program snippet here

[apokerce]

I was calling reader function in another main after adding to that part to solved my problem. Thank you very much for looking in this issue.