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AVI render introducing judder

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David Kostyk
AVI render introducing judder
on May 10, 2019 at 5:20:11 am
Last Edited By David Kostyk on May 10, 2019 at 6:40:44 am

(First post. Sorry if I'm not following any protocols. I searched my issue but found nothing.)

I have been attempting to edit the video content and replace the audio source of an old video file (live music stream circa 2006), then convert to lossless AVI so I can ultimately convert to h.264 (a codec unsupported in Vegas 12). Because my only available source uses Windows Media Video 9 (VC-1 WMV3), I cannot use "no-recompress long-GOP rendering" so using lossless AVI is an attempt to create a lossless intermediate file which won't further dilute the compression (i.e. WMV3 > lossless AVI > h.264 should effectively yield the same results as WMV3 > h.264).

Here's where it gets weird: my source is not only awful WMV3, but also has an obtuse 20p frame rate. I assumed this would be okay because AVI supports any arbitrary frame rate down to millionths of a frame. However, when I encode WMV3 @20p > lossless AVI @ 20p, the result has clear judder. While the original has terrible video quality it at least has smooth motion; Not so for my resultant lossless AVI, which seems to have (at least) one or two interpolated frames per second creating judder. I'm at a loss as to what would be causing this because I assumed going 20p > 20p would yield a 1:1 result for frames. Turning on "Interleave every frame" seemed to result in a nominal judder improvement, but did not eliminate it (could also just be placebo effect?).

Below are the technical details of the original file (I've removed the additional elementary video streams at "~~~~~": they are just lower-quality fallbacks and are not relevant here).
General
Complete name : M:\Recordings\Live Music\Oysterhead\Oysterhead - 2006-06-16.asf
Format : Windows Media
File size : 638 MiB
Duration : 1h 44mn
Overall bit rate mode : Constant
Overall bit rate : 855 Kbps
Maximum Overall bit rate : 57.4 Kbps
Movie name : Bonnaroo music festival
Performer : AT&T
Encoded date : UTC 2006-06-16 19:12:52.671
Copyright : AT&T June 16, 2006

Video #1
ID : 2
Format : VC-1
Format profile : MP@ML
Codec ID : WMV3
Codec ID/Info : Windows Media Video 9
Codec ID/Hint : WMV3
Description of the codec : Windows Media Video 9
Bit rate mode : Constant
Bit rate : 519 Kbps
Width : 400 pixels
Height : 300 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Nominal frame rate : 20.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Language : English (US)

~~~~~

Audio
ID : 1
Format : WMA
Format version : Version 2
Codec ID : 161
Codec ID/Info : Windows Media Audio
Description of the codec : Windows Media Audio 9 - 32 kbps, 44 kHz, stereo (A/V) 1-pass CBR
Duration : 1h 44mn
Bit rate mode : Constant
Bit rate : 32.0 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 23.9 MiB (4%)
Language : English (US)


Below are my current options for lossless AVI rendering.


EDIT: I'm not using any video FX, just brief fading at beginning and end.

Beyond Vegas 12, I'm also playing back both files in VLC Player 2.0.4.

Hopefully I've conveyed my issue correctly. If any additional info (like an AVI file sample or even the original WMV3 file) is needed, I'm happy to provide. Thanks for reading and for any suggestions.


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