Premiere Pro video problem

[MillenaryWish]

So I'm having a really weird issue with premiere pro.
here is a screenshot

The artifacts only appear on certain parts of the video.

Video Info
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High 10@L5.0
Format settings, CABAC : Yes
Format settings, ReFrames : 16 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 23mn 40s
Bit rate : 1 795 Kbps
Maximum bit rate : 6 692 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.081
Stream size : 304 MiB (100%)

The original source was an mkv file and since you can't import mkv files into Premiere i used mkvextract and My MP4Box GUI to put the raw video file into an mp4 container.
Could that be causing my issue?
Let me know if you need any more information.
-Thank you

[MillenaryWish]

[mirkosp]

Bit depth : 10 bits

You'll have to convert it to a lossless format so that Premiere can read it properly. I suggest UTVideo YUV420 BT.709 lossless clipping with VirtualDub. You can properly load the footage in VDub through ffms2 in avisynth.
read AbsoluteDestiny & ErMaC's Technical Guides to All Things Audio and Video for more info, but you'll need to update the ffms2 that'd come with the amvapp.
You'd pick the vanilla 2.17 build from here and overwrite the ffms2.avsi, ffms2.dll, and ffms2.exe files in the plugins folder in which you installed avisynth (so generally we're talking about 'C:\Program Files (x86)\AviSynth 2.5\plugins\').
LWLibavVideoSource would be even better, but that requires a couple extra steps to be usable, and as you seem to be new to avisynth (since you aren't using it yet, I think), I'll avoid for the time being.

[MillenaryWish]

I know the basics, Could you teach me how to use LWLibavVideoSource? I would greatly appreciate your help. I guess it's time to free up some space hehe.

[mirkosp]

Well, first you need to grab the zip from here. Current latest version is r662.
Then you extract the .dll files for avisynth in the plugins folder. As for usage...

Code: Select all

LWLibavVideoSource("file.mkv", format="YUV420P8")

Gives you a 4:2:0 8bit video, so in case the input is 10bit, it dithers.
If you don't specify the format, or if you wish to do further 16bit filtering and then dither yourself, then...

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LWLibavVideoSource("file.mkv", stacked=true, format="YUV420P16")

Will give you a stacked 16bit video which you can then filter with stuff like the dithertools and other 16bit filters and then bring to 8bit with ditherpost.

Generally the former solution is what you want. You can also check the whole format list directly from avspmod while you are using the filter in case you want to do something specific. This will help in case you have 422 or 444 videos and wish to keep the higher chroma detail. FFMS2 internally converts to 8bit and doesn't give you a lot of control, but aside from that there's also the fact that LWLibavVideoSource has better frame accuracy with some formats, notably blu-ray m2ts with progressive AVC, among the many. Here's a list of the improvements over simply using libavformats, which is what ffms2 does.