Interlacing artifacts in ProRes, but not DV codec?
 

Hi

I have digitzed a bunch of PAL vhs tapes into Premiere on mac.

Equipment: Sony SVP 5600p > blackmagic intensity shuttle
I chose ProResHQ as capture format.

When watching the footage in vlc/quicktime I see those well known horrible interlacing lines.

But then comes the strange thing: when capturing using a DV-player/firewire (to DV codec) instead of intensity shuttle, the horrible interlacing lines are not there whennwatcing in vlc/quicktime. Hard edges appears soft instead of showing the combing effect..

Why?

It's a bad combination for a VHS job, Premiere/Mac/DV/Intensity Shuttle/ProRes, You will be better off posting in a Mac forum because most of the members here are PC based folks, No offense but just trying to be realistic.

I've been using Mac (actually pre-Mac Apple) since before Windows. :wink2:
But yes, the root issue may be the gear itself, not Mac.

Blackmagic does a horrible job with consumer analog sources like VHS, and was designed (and as an afterthouht feature) for pro sources only like BetacamSP.

ProRes422 is the ideal choice for capture codec for VHS.

VHS is an interlaced format. You should see interlacing in the capture. If not, you're capturing wrong. However, VLC should deinterlace when the deinterlacing playback filter is enable. Is it? If so, then something is wrong with the capture.

Samples mean more than words. Don' tell us, show us. Attach a tiny sample, just 2-3 seconds.

I will get you video samples. For now all I got is this screenshot of the two different vide files playing side by side in quicktime. The ProRes version to the left, DV to the right.

Just for anyones information, I am well aware of what interlacing is. My reason for wondering was that I expected both files two show the same artifacts.

edit- OK, i see compression in digitalteq destroyed the image, I will get back to it

Submit the two sample images separately, not side-by-side, max forum width for image attachments is 890px.
The images should be 720x wide.

Here is the ProRes screenshot from quicktime

And her is the DV-version without comb-effect

The "without" has blended deinterlace, and that's not good. Ghosting, blurry.
You need to attach some actual sample clips.

I will do later today when I am finished working

Most likely the DV version is being deinterlaced automatically when being played back, while the ProRes version is not.

The DV codec interlaced (BFF) by default, so the player will know it is and turns on deinterlacing on playback (technically some camcorders could do some 24fps pull-down stuff but DV is otherwise always interlaced). The ProRes codec does support interlacing as well, but it may not be enabled by default, or quicktime/vlc doesn't enable deinterlacing by default for it. You can use e.g https://mediaarea.net/en/MediaInfo (runs on both macos and windows) to check if the file is flagged as interlaced. If it's not you will have to manually tell the application using it that the video is interlaced (with top field first). There may or may not be a setting in the blackmagic capture codec settings to indicate whether the video should be compressed with interlacing support or not.

Hi Hodgey.

You are absolutely right. I tested it now, and it turns out that QT deinterlaces the DV-material by default, not the ProRes. Thanks