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View Full Version : Ambisonic and dts audio conversion for dvd movies (48khz)


dannyv
14th January 2004, 18:35
Greetings,

I’m relatively new to creating DTS audio cd’s using Eye Of Horus excellent Ambisonics guide. I’ve created several cd’s, which came out great. Now I’m on to a new project, which is converting several 2 channel DVD movies to DTS. I’m basically looking for some tips and tricks because I came up with a few problems on my first attempt.
I rip the audio (48khz 192bps) from the cd using dvd2avi and had to run it through besweet to turn it into a WAV so the audio player in budile would recognize it. I then ran it through budile as outlined in EOH’s guide and the only modifications was setting budile to 48khz in preferences and adding a lowpass filter for the subwoofer channel.
I then ran it through besweet and converted it to 6 separate wav files.

I found that if I used -ota( -g max -fs 48000 ) I would get 0 byte wav files. Unfortunately I’m writing this from work so I can’t supply the log files but noticed that the process would determine the overall track gain of 9.40db then the window would close just before the transcode process.
If I used -ota( -fs 48000 ) eliminating the normalization (-gmax) I would get 6 wav files that were over modulated a bit. When I put them in surcode-dvd the start and end times would not match the actual length of the move e.g. movie is 1:31:44 but surcode-dvd shows it as 6:40:34. When playing the wav files in surcode they play fine (correct pitch). Now the over-modulation I’m sure I can correct within ambisonic but any tips, tricks or suggestions on these problems would be greatly appreciated.

A few notes:
My system configuration can be seen in the signature line at the bottom of this post
All software is the latest version

Regards Dan

daphy
15th January 2004, 07:39
look here (http://forum.doom9.org/showthread.php?s=&threadid=60907)

CYA Daphy

dannyv
15th January 2004, 17:11
Originally posted by daphy
look here (http://forum.doom9.org/showthread.php?s=&threadid=60907)

CYA Daphy

Excellent thread I got a lot of good information. I'm off to try this again. I'll post my results.

Thanks daphy.

dannyv
16th January 2004, 18:54
Greetings,

After reading the thread I found many mistakes I was making.
I finaly wound up converting the 2channel ac3 file to WAV and normalizing in besweet before feeding it to buidel. I then ran it through buidel setting it up for 48k 32bit. I then ran it through besweet -6chfloat and no normalization (no g max or g peak. then ran it through surecode dvd.

The results were pure perfection. I did the beatles DVD movie help. The result was like sitting in the middle of a large sound stage with them playing all around you. The instruments were placed in spicific locations on the sound stage and each instrument and vocal had perfect seperation and clarity. the difference between the original 2ch and the new 6ch dts is like going from vinal to cd again for the first time.

Thanks for all the help.

Regards,
Dan