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Old 03-30-2017, 04:22 AM   #1
nath
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Default converting VOB (NTSC) to DV (NTSC) producing large pixels blocks

I am puzzled, and can't explain it. What would cause this noticeable loss in image quality? The DV output file has much larger pixel blocks.

I need to encode a VOB file into a DV file; same frame size, same frame rate, same aspect ratio; same everything ... simple, right?

Well, after setting up the project; exporting the DV file; comparing the DV file to the original VOB file, side-by-side inside an HD project (zoomed in to 300%), I discovered that the VOB file looks much better and has finer grain. The blocks (pixels) are much smaller in size, almost half the size!?!

The VOB master file is pulled from a DVD, and is mpeg2 750x480 59.94i 4:3 8bit (lower field.) The file was produced by some other software (not Edius) ... not by me.

Project is set to SD DV 750x480 59.94i 4:3 8bit (lower field)

Export file is set to AVI DV codec, set to SD DV 750x480 59.94i 4:3 8bit (lower field)

Any idea what could be causing this?

Thanks
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Old 03-30-2017, 05:09 AM   #2
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I hope you demuxed and joined the VOB prior to opening it in an SD project

then you export to DV from the SD project and not from a HD project
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Old 03-30-2017, 05:01 PM   #3
nath
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Quote:
Originally Posted by antonsvideo View Post
I hope you demuxed and joined the VOB prior to opening it in an SD project
I did not know that a prior demuxing is required using Edius. So far Edius was holding the VOB file just fine. I only need to use the image portion (no sound), and only a small part of the main VOB file. I downloaded a suggested demuxer https://www.videohelp.com/software/Vobrator ran it, and it produces a smaller file once demuxed. After the demuxing the file (now a .m2v file) is 163,259 KB, whereas before that vob was 175,394 KB in size. I assume it must be due to removing some of the VOB structure of the file.

Quote:
Originally Posted by More4K View Post
DV is old and quite crap and can introduce macroblocking easily. Nothing surprising.
I also tried GV HQ codec but get the same effect.

Quote:
Originally Posted by More4K View Post
Don't judge file quilt by its size- this is not very accurate measure at all :)
I was not measuring the file size but the pixel size ... but at closer look they measure the same (sorry for the flase alarm.)

10 pixels = 4 1/4 inches on my monitor for the DVD VOB file or the processes DV or GV HQ file.

All is good now.
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Old 03-30-2017, 08:09 PM   #4
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Quote:
Originally Posted by nath View Post
After the demuxing the file (now a .m2v file) is 163,259 KB, whereas before that vob was 175,394 KB in size. I assume it must be due to removing some of the VOB structure of the file.
I would assume that was due to the removal of the audio m2v is video NOT video and audio.
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Old 03-31-2017, 01:38 AM   #5
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Quote:
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I would assume that was due to the removal of the audio m2v is video NOT video and audio.
that is correct, demuxing separates video and audio, m2v = video only and ac3 etc = audio

but most importantly, if there are more than one VOB in the set, they need to be joined correctly otherwise you will end up with sound glitches

the best free tool for demux and join is PgcDemux (free)

also, Tmpeg mastering works does a great job converting any DVD to DV or HQ or HQX or Lossless etc
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Old 04-01-2017, 11:36 PM   #6
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Anton - I've never demuxed anything - much less a DV or VOB file. And since this forum is an "education" stream for those of us less knowledgeable - what does demuxing actually DO to the resulting file instead of just bringing the VOB or DV file onto the EDIUS timeline - which I frequently have need to do?
Many thanks,
Alan
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Old 04-01-2017, 11:51 PM   #7
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Hi Alan

there is no need to demux a DV file, I am not sure where you heard that

if the DVD is short and only has one VOB, you can use it in EDIUS without join and demux

if there are two or more VOB files that belong in a set, they need to be joined and demuxed

so after join and demux, you have one video file and one audio file

without join and demux, you will be getting missing audio frames at the points where the VOB files join
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Old 04-02-2017, 09:22 PM   #8
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Many thanks Anton. Makes perfect sense! Any chance to see you at NAB this year??
A
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Old 04-03-2017, 12:14 AM   #9
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Quote:
Originally Posted by AJL14 View Post
Many thanks Anton. Makes perfect sense! Any chance to see you at NAB this year??
A
I won't make it this year, unless I win Lotto :)
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Old 04-03-2017, 08:22 PM   #10
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Oh, Poo! I'm buying you a Lotto ticket this morning. LOL.
A
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