Extracting LPCM audio from Blu-Ray (problems)

[delirial]

Hi,

I've been using my Narnia BluRay to test out encoding from BR to MKV. At first I used AC3 audio, but now I want to use DTS.

I've demuxed the PCM audio using TsMuxer, but it will create two separate .wav files. My guess is it is splitting them at 4GB because of the FAT32 limitation (even though I'm on a NTSC system). I convert both files to DTS with eac3to. The problem is that after I merge them (append) with the video in mkvmerge, the movie gets out of sync after around 01:33:00. I tried this and got the same result with Harry Potter 4.

Strangely enough, my Good Luck Chuck enconde seems to be perfectly synced. And it was also split in two .wav files.

I tried demuxing the pcm with ea3to also and then converting to DTS. While it demuxed a single .pcm file, the output DTS file is around 30 seconds longer than the video file. I can't determine if the problem is the demuxing or the enconding to DTS since I can't open .PCM files to check their length. MPC, VLC, WMP won't open the .pcm file.

What should I use to demux the pcm stream? How can I open pcm streams?

regards,
delirial

[GeeForce11]

I tried demuxing the pcm with ea3to also and then converting to DTS

Try to do the demuxing/encoding in one step with eac3to. Instead of demuxing the audio and after that converting it to dts try like this "eac2to movie.m2ts 2: audio.dts -768"

Could also try to demux it to .wav and then encode it to dts, but the first option would be my best choice.

I'm just guessing that the fps got lost during the 2 step conversion and that's why it got out of sync.

[delirial]

One-step conversion didn't work either. It generates a dts file that is longer than the movie. I tried both ts bitrates, but no luck. I also tried to different versions of 3ac3to.

I opened the dts file with MPC and it crashes the player.

Any other ideas?

[GeeForce11]

What program are you using to create the mkv from m2ts?

I'd try to create the mkv with lpcm audio without modifying anything (direct stream copy) and try to convert it afterwards.

[delirial]

The problem seems to have been a dts decoder issue. I'm guessing MPC misread the file length or something. Once merged with mkvmerge gui, the audio was perfectly in sync and had the correct length.

Still doesn't explain the original problem where it fell out of sync after 1:30:00, but now I don't care since using eac3to to directly encode to DTS is working very well.

Thanks!