I run into this issue - in this case an approx 90 min vhs transfer. Convert the DV file to Huffyuv, no problem. Deinterlace via QTGMC via Avisynth via Virtualdub to a 59.94 frame rate, no problem.
However, when I take that deinterlaced video, apply some cleanup filters and upsize it to 1280 x 720 with Virtualdub, I find that there's only half of the audio. I.e. the last 50% of the audio is missing, which is reflected in the GUI of Vegas. It's not some dysfunctionality with Vegas because the 50% is missing no matter what it's loaded into. The time lengths of the audio and video are identical.
If I recombine the audio and video with Vdub selecting "audio from other source" creating a new file then everything is okay. But it's obviously a PITA extra step that shouldn't have to happen. Apparently there's something that needs to be done differently at the stage of upscaling the video. Simply selecting "audio from other source" during the Vdub upscaling doesn't help.
Any suggestions?
Thanks.
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Last edited by brassplyer; 12th Dec 2012 at 12:50.
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QTGMC via Avisynth via Virtualdub for the deinterlace, Virtualdub for the other filters and the upscale/resizing. I've edited my original post to clarify this.
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Why don't you just do all at once in VirtualDub?
For that clean up, do you use Direct stream copy for audio? -
Before I first noticed the problem I used "Source Audio" and "Direct stream copy". Then I tried "Copy audio from other source" which didn't fix the problem.
Hmm, should I have used "full processing" under audio as well as video? I didn't think I would need to since I wasn't making any changes to the audio - EQ etc. - within Vdub. -
Are you dragging the audio along for the whole process? You may be converting it to 59.94 causing only half of it to be recognized.
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But video is too 59.94,
Huffyuv have something that VirtualDub is not reading upon loading?
Interesting question with full processing mode, it is uncompressed in the first place, so it will create uncompressed audio as well, I guess that would be the same copy with full processing mode? -
It recognizes all the audio after the deinterlace & doubling of the frame rate. The problem only manifests itself after the upscaling step.
Why not just break it out early and add it back in vdub during your final upscale. Not exactly what you're looking for but it may save you a step. -
If you have that clean filter for avisynth you can do the whole thing completely at once, you load script with filters and load it directly into some x264 encoder (meGui, or command line) you set it to give you BD compliant H.264 raw files. You mux video and audio with TsMuxer for BD. No menu though.
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Doesn't make any sense . If it's fine before, and you use direct stream copy for audio, nothing is changed in the audio
Exactly what "cleanup and upscaling" in vdub are you doing?
(You can even do the upscaling in avisynth (better quality, less aliasing) , and can probably find equivalent or better cleanup filters) -
Agreed.
If you really must/want to find out where things are going wrong, you have to test those "some cleanup filters and upsize it" steps one by one (at least that is where the problem seems to occur according to your description). Apply the first one only, save to disk from VirtualDub, test audio, if no problem add next one, etc. -
Noise reduction, Brightness/Contrast, HSV, sharpening. By upscaling I mean putting the 4:3 image into a 16:9 pillarboxed image and going to 720p.
(You can even do the upscaling in avisynth (better quality, less aliasing) , and can probably find equivalent or better cleanup filters)
I do wonder if there's a significantly better noise reduction filter for Avisynth or if there's only so much you can do without making the image look artificial. -
I was asking to rule out if a specific filter might be causing the audio issue - none of those operations you listed should account for your observations
(You can even do the upscaling in avisynth (better quality, less aliasing) , and can probably find equivalent or better cleanup filters)
Poor deinterlacers do a bad job of interpolating the missing information in interlaced content (that's why you get jaggies, "marching ants" in the first place) , but the same token, an enlargement using a standard resizer will result in the same artifacts.
Think of it this way - when you bob deinterace you're essentially enlarging each field to become a full frame . But if you just enlarge it without all those other processing steps, QTGMC will be as poor as another deinterlacer . Adding sharpening , other post processing afterwards will just sharpen the aliasing artifacts . At least with nnedi_rpow2 - you have a cleaner upscale and fewer aliasing artifacts - so it will respond better to sharpening and other post processing steps
I do wonder if there's a significantly better noise reduction filter for Avisynth or if there's only so much you can do without making the image look artificial.
But I have no idea what is causing the original problem. If you take that exported video and open it in vdub is there full audio ? It would seem more like incompatibility with vegas despite what your are saying . If the it works fine in everything else but vegas....wouldn't the problem be vegas ? Maybe I'm misinterpreting what you are saying ?
It's not some dysfunctionality with Vegas because the 50% is missing no matter what it's loaded into. The time lengths of the audio and video are identical. -
You keep mentioning "PITA". Is that the flatbread, or the animal rights group?
And just for fun, why don't you demux the audio before processing? And see what's there. Maybe it's no-good from jump. -
What I've been doing to A/B is saving filter chains - "save processing settings" and just loading them. Takes a couple of clicks. Happens pretty much instantly. A set of preset buttons would be even faster but it's not too bad.
The other thing is besides the individual filter adjustments, the order of the filters can make a big difference.
Also, why are you converting to huffyuv then deinterlacing with qtgmc ? Why not load the original DV ? and do all the other processing in 1 step as suggested above? Seems like you're doing a few extra unnecessary steps? The more convoluted your workflow - not only wastes your time and HDD space - it increases the risk of something inadvertently going wrong . -
ok, can you use gspot or mediainfo(view=>text) , what do they say about the audio duration ? how does the report compare with the other earlier steps
Also, why are you converting to huffyuv then deinterlacing with qtgmc ? Why not load the original DV ? and do all the other processing in 1 step as suggested above? Seems like you're doing a few extra unnecessary steps? The more convoluted your workflow - not only wastes your time and HDD space - it increases the risk of something inadvertently going wrong .
DV=>QTGMC=>HUFFYUV => farther processing
DV=>HUFFYUV=>QTGMC=>HUFFYUV => farther processing
Now there are times and valid reasons, when you might want to break out steps . The 1st step isn't one of those times. -
Seems to me that Vegas is "deinterlacing" the audio too. Did you match the project settings to the source? Is "Adjust Media To Match Project" selected?
The problem with using utilities is they will allow you to screw things up, and remain silent. So you have been hoist by your own petard.Last edited by budwzr; 13th Dec 2012 at 11:40.
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My reason for going to Huff in the first place is of course to avoid generational degradation. Do you feel a deinterlace done on the DV file before converting to Huff as per the first example above will produce identical results to a deinterlace done on a file converted to Huff first?
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Think of it this way, Avisynth loads DV.avi directly , video has to be decoded to uncompressed YUV, then QTGMC filter comes . So at the begging using that Huffyuv is useless step. That deinterlace within Avisynth is happening on uncompressed level anyway.
AviSource("C:\DV.avi")
AssumeBFF()
QTGMC( Preset="slow" )
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