Playback of HDR-FOX Recordings

I'll cross post this here then : )

See - seems that passing a standard definition recording through Raydon's AV2HDR tool should produce files that the Foxsat can play back.

Unfortunately, the Foxsat cannot handle AAC audio so HD recordings won't work in the same way unless you convert the audio track prior to passing them through AV2HDR. Without the conversion step you get video but no sound.
AV2HDR will process the TS file from the HDR Fox T2 but any AAC audio stream will be incorrectly interpreted and flagged as MPEG, so playback will be video only. The Foxsat HDR does not support AAC audio streams so you will need to convert the audio stream of any HD recording to MPEG1 layer 2 or Dolby AC3 prior to running it through AV2HDR.
So, it should be okay with SD content as that contains MPEG1 layer 2.

    Stream #0:0[0x1ab1]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 544x576 [SAR 32:17 DAR 16:9], 15000 kb/s, 34.48 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1ab2](eng): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16, 128 kb/s
    Stream #0:2[0x1ab3](eng): Audio: mp3 ([4][0][0][0] / 0x0004), 0 channels, s16 (visual impaired)
    Stream #0:3[0x1ab6](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
So, it should be okay with SD content as that contains MPEG1 layer 2.
Yes, The muxer in AV2HDR cannot handle AAC, and neither can the Foxsat HDR. SD content can be converted directly without pre-processing, but HD with AAC audio needs audio stream conversion first.