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Old 3rd March 2005, 15:10   #1  |  Link
Inventive Software
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AviSynth issues regarding DVD decoding

I'm doing some tests with AviSynth and DVD Decrypter to encode PAL DVDs into different video codecs. DVD Decrypter copies the movie video stream and the 6 channel AC3 stream into a VOB file. Because it's a FAT32 hard disk, the VOBs have to be 4 GB. I have CyberLink PowerDVD 5 installed to use the MPEG-2 DirectShow decoder. This is the AVS script I'm using to decode the VOB to be opened in VDubMod:

SegmentedDirectShowSource("C:\the_matrix_revolutions_d1\video_ts\vts_01.vob")

By checking the source movie files, there should be 185923 frames. Instead there is about 105000 frames, so there's a big chunk of the file missing. I also tried loading it in a media player, and still get the same result. Any guesses?

I have to use AviSynth to load the 2 VOBs, as VDubMod cannot splice VOBs.

I'm using VDubMod 1.5.10.1 on a Win98SE machine with 192 MB RAM and a 120 GB hard disk, so a 4 GB limit is unwantingly forced, with an NVIDIA 5200 PCI graphics card. (Yes, I know PCI is ****, but I don't have ANY damn AGP slots on the motherboard. It's 3 yrs old!)
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Last edited by Inventive Software; 3rd March 2005 at 15:15.
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Old 3rd March 2005, 15:19   #2  |  Link
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Use DGMPGDec for your VOB decoding.
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Old 5th March 2005, 05:20   #3  |  Link
actionman133
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what i do is demux video and audio with dvd decrypter (resulting in an m2v file and an ac3 file) and load the video via DGDecode (part of DGMPEGDec). I use AC3Filter as the DirectShow filter for Dolby decoding.

Then for my script i use:

Code:
LoadPlugin ("...\DGDecode.dll")

Video1 = MPEG2Source ("xxxx.m2v", idct = 5) # 5 for P4 PC
Audio1 = DirectShowSource ("xxxx.ac3", video = false)

Video2 = MPEG2Source ("xxxx.m2v", idct = 5)
Audio2 = DirectShowSource ("xxxx.ac3", video = false)

Video3 = MPEG2Source ("xxxx.m2v", idct = 5)
Audio3 = DirectShowSource ("xxxx.ac3", video = false)

Video = Video1 + Video2 + Video3
Audio = Audio1 + Audio2 + Audio3 # or whatever is necessary

AudioDub (Video, Audio)
DelayAudio (0) # Delay as recorded, of course

# Then resize, crop, and filter as desired
It provides very fast decoding, and you can choose specific decoding options. much more controlled than PowerDVD's decoder.
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Old 7th March 2005, 10:38   #4  |  Link
Inventive Software
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OK, I think I figured out what it was. The DVD does not decrypt properly, which is a slight problem.

I have done it similar to what you say there, but with the DirectShowSource and AC3filter, but I still get the same results as before.

Still got to try those 2 filters, and see how they do.

Gimme a couple of days for rigourous testing.
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