So, same issue with 1080i.
As many of you I've been frustrated by the latest FOV releases and audio issues.
So, last night I had enough and did not go to sleep until I figured it out.
I read up on audio headers then I separated (demuxed) the video (h264) and audio (ac3)
and began doing some forensic analysis on the ac3 audio. Many programs got confused while trying to open this file, some reported it as stereo, some as 5.1 dolby digital.
I tried many things, including extracting all 6 audio channels and resampling the audio then muxing it back into an AC3 file and trick the header.
Long Story Short, I finally figured it out and fixed it.
Now, I don't want to break any forum rules, but I'm wondering if I can share these videos with the Final Gear community?
PS, If you're interested in the specifics of why this is happening or want to attempt to repair these yourself;
What's happening is when FOV is recording and editing these episodes he's unintentionally leaving around 200 milliseconds (blank screen) from the previous show that was on BBC.
And guess what, that previous program was stereo in lieu of 5.1 DD.
So what you have is an audio file that starts out stereo and switches to 5.1 DD, thus causing things to wrong.
If you are so inclined you can repair these files with the use of 3 free programs; [MKVToolNix + GUI], [TSMuxer + GUI] & [DelayCut]
Steps
1) Use MKVToolNix GUI to Demux (seperate the video & audio)
2) Open the resulting .ac3 file with DelayCut and remove the first 200ms. (This can be tricky, you need to make sure you keep the number of frames in check. (Keep the file length correct)
3) Use, TSMuxer GUI to now rejoin the Video and the new fixed ac3 audio file from DelayCut. Make sure you add a 250ms delay in TSmuxer to account for the 200ms + minimal loss from DelayCut
Resulting .ts or .m2ts works perfectly now!