Converting PCM or Dolby TrueHD 5.1 to DTS HD-MA 5.1?

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Hello all.
I have a DENON AVR-S770H receiver.
I also have an mkv file with 2 audio tracks that can't play correctly.
The first is a pcm 5.1 track but my receiver shows me that the input signal is stereo and can't decode it to 5.1.
Even when I press Dolby Surround, the dialogue seems to bleed in the other than the center speakers.
The second track is Dolby TrueHD 5.1, but with that track I don't hear anything at all (although I can play blu-rays with such audio format).
Both tracks are in 44.1KHz and not 48KHz which is the norm. Maybe that is the fault?

So, I'd be interested in converting (without quality loss) any of those 2 tracks to a correct and playable 5.1 track.
Is this possible? Does anyone know how?

By the way, here's the info on the 2 tracks in case that helps:

Audio #2
ID : 3
Format : PCM
Format settings : Little
Codec ID : A_PCM/FLOAT/IEEE
Duration : 2 h 6 min
Bit rate mode : Constant
Bit rate : 8 467 kb/s
Channel(s) : 6 channels
Sampling rate : 44.1 kHz
Bit depth : 32 bits
Stream size : 7.51 GiB (6%)
Default : No
Forced : No

Audio #3
ID : 4
Format : MLP FBA
Format/Info : Meridian Lossless Packing FBA
Commercial name : Dolby TrueHD
Codec ID : A_TRUEHD
Duration : 2 h 6 min
Bit rate mode : Variable
Maximum bit rate : 9 597 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 44.1 kHz
Frame rate : 1 102.500 FPS (40 SPF)
Bit depth : 24 bits
Compression mode : Lossless
Default : No
Forced : No

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try clever FFmpeg-GUI

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try clever FFmpeg-GUI

Thank you very much!

I converted the pcm track (which showed as 2 channels originally and didn't decode correctly with Dolby Surround) to Dolby TrueHD 48KHz, and it seems that did the trick!
I haven't muxed in the track yet in the mkv, but I previewed it with VLC and it seems correct now, in 5.1 surround sound with the dialogue coming only from the center and not bleeding in the other channels.
I don't suppose anything was "lost" during the conversion from 44.1KHz to 48, was there?