Hippo
20th April 2003, 22:11
Hello,
Does software exists which can extract uncompressed stereo 24/96 WAV data from DVD-V VOB files?
The mentioned 24/96 VOB compilation contain private music recordings which was succesfully burned to DVD-R (as an audio-only music compilation DVD-V disk) using the Sonic Foundry DVD Architect 1.0 program. Although not mentioned in the manual and perhaps accidently permitted, SF DVD Architect is quite able to import and burn high resolution 24/96 LPCM stereo files to DVD-R without down conversion. This feature is certainly a great bonus for all music- and audio enthiousiasts who are struggling to make their own high-resolution audio discs. The 24/96 DVD-V audio plays fine on PowerDVD and all other standalone DVD players I tried. On my Samsung DVD player even with full 24 bit & 96 Khz resolution at the digital output. Ofcourse without encryption or SCMS copy protection schemes on the digital output.
The only disadvantage is that DVD Architect cannot always create a gapless transition between subsequent audio tracks, which in that case occasionally results in a small (0.01 to 0.045 sec) gap or similar sized duplicate wave form segment between continuous audio tracks on the burned DVD. These findings are not unexpected, the same thing happens for audio CD's in Track-at-Once mode. To avoid gaps in audio CD's one needs therefore to burn the CD in Disc-at-Once mode where the length of each audio track must be an exact multiple of 588 samplepoints (1/75 sec * 44.1 KHz).
All in all, in order to see where the DVD burning problems originally come from I want to check the burned audio DVD's by extracting the audio from the VOB files back to hard disc and like to make a bit-by-bit comparison between the DVD copy and the original source WAV files. At the moment I can make a digital 1:1 copy from the SP/DIF output of my DVD player to a RME soundcard in my computer, but that is ofcourse not the quickest and most reliable route.
So, are conversion tools around from VOB back to LPCM 24/96 ? I tried the combination Vobedit and BeSweet, but was not able to get usable WAV audio from the various audio VOB chapters. It seems that 24 bit LPCM audio gets truncated in the raw VOB files with the higher 8 bits wrapped in an odd way.
The other big question here: what is the minimum sector or framesize for high-resolution audio data on DVD-V ? Even when there is no video at all on my disc (only stills) one expects that a PAL 24/96 formatted DVD-V disc has a minimum frame size of 3840 samples (1/25 sec PAL frame * 96000 samples. Individual WAV tracks cut on a multiple of this sector size exhibit so far no gap errors in test burns. However, other lengths of WAV files work 70-80% of the time correctly as well.
How is this possible ?
Please any ideas or suggestions are welcome ?
Hippo
----------------------------------------------
Tools:
Sonic Foundry DVD Architect 1.0 build 160
BeSweet v1.5b16
Vobedit 0.6
Hardware:
Pioneer DVR-A05 writer (firmware 1.00)
Pentium IV-2.8 GHz, 1 Gbyte RAM
Samsung S324 DVD player
-----------------------------------------------
:confused:
Does software exists which can extract uncompressed stereo 24/96 WAV data from DVD-V VOB files?
The mentioned 24/96 VOB compilation contain private music recordings which was succesfully burned to DVD-R (as an audio-only music compilation DVD-V disk) using the Sonic Foundry DVD Architect 1.0 program. Although not mentioned in the manual and perhaps accidently permitted, SF DVD Architect is quite able to import and burn high resolution 24/96 LPCM stereo files to DVD-R without down conversion. This feature is certainly a great bonus for all music- and audio enthiousiasts who are struggling to make their own high-resolution audio discs. The 24/96 DVD-V audio plays fine on PowerDVD and all other standalone DVD players I tried. On my Samsung DVD player even with full 24 bit & 96 Khz resolution at the digital output. Ofcourse without encryption or SCMS copy protection schemes on the digital output.
The only disadvantage is that DVD Architect cannot always create a gapless transition between subsequent audio tracks, which in that case occasionally results in a small (0.01 to 0.045 sec) gap or similar sized duplicate wave form segment between continuous audio tracks on the burned DVD. These findings are not unexpected, the same thing happens for audio CD's in Track-at-Once mode. To avoid gaps in audio CD's one needs therefore to burn the CD in Disc-at-Once mode where the length of each audio track must be an exact multiple of 588 samplepoints (1/75 sec * 44.1 KHz).
All in all, in order to see where the DVD burning problems originally come from I want to check the burned audio DVD's by extracting the audio from the VOB files back to hard disc and like to make a bit-by-bit comparison between the DVD copy and the original source WAV files. At the moment I can make a digital 1:1 copy from the SP/DIF output of my DVD player to a RME soundcard in my computer, but that is ofcourse not the quickest and most reliable route.
So, are conversion tools around from VOB back to LPCM 24/96 ? I tried the combination Vobedit and BeSweet, but was not able to get usable WAV audio from the various audio VOB chapters. It seems that 24 bit LPCM audio gets truncated in the raw VOB files with the higher 8 bits wrapped in an odd way.
The other big question here: what is the minimum sector or framesize for high-resolution audio data on DVD-V ? Even when there is no video at all on my disc (only stills) one expects that a PAL 24/96 formatted DVD-V disc has a minimum frame size of 3840 samples (1/25 sec PAL frame * 96000 samples. Individual WAV tracks cut on a multiple of this sector size exhibit so far no gap errors in test burns. However, other lengths of WAV files work 70-80% of the time correctly as well.
How is this possible ?
Please any ideas or suggestions are welcome ?
Hippo
----------------------------------------------
Tools:
Sonic Foundry DVD Architect 1.0 build 160
BeSweet v1.5b16
Vobedit 0.6
Hardware:
Pioneer DVR-A05 writer (firmware 1.00)
Pentium IV-2.8 GHz, 1 Gbyte RAM
Samsung S324 DVD player
-----------------------------------------------
:confused: