Participating Frequently

Question

Premiere is playing glitches that aren't there

Forum|Forum|5 years ago
April 26, 2020
2 replies
2807 views

I'm seeing occasional glitches in videos playing in Premiere that I don't see anywhere else.

Specifically they are mxf clips encoded with the xdcam hd 35 codec. These are pre-edited clips that look perfectly clean in quicktime, and also in fcpx, however when brought into Premiere, it's showing a glitch that's not there anywhere else.

I had someone who has actually created encoding software take a look at it, and he said using the tools he has that he doesn't see anything wrong with the clip, but he was able to duplicate the glitch on his version of Premiere. I'm on a Mac (2018 mbp, the os and adobe CC all up to date) and my co-workers have seen the same glitch on my clip in Premiere which they run on a PC.

My guy says that Adobe uses it's own mxf decoder, rather than the one that's built into my mac. Could this be where my problems are stemming from? Currently I'm forced to review everything I edit by bringing it into Premiere and watching it carefully for glitches. This isn't a fun workflow.

Any one with similar problems? or a viable work around?

Thanks in advance!

Error or problem

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Joost van der Hoeven

Community Expert

Can you please share your system info? Like OS and version, CPU, RAM, GPU vRAM, Pr version? Thanks. Also a screen grab of your issue will be helpful.

K

katcroft

Participant

@Joost van der Hoeven , Thank you for your help here.

@mmorache Mark interesting that you had the issue again recently. I hope we solve this!

Thanks for everyone's sleuth work here.

Issue: MXF playback in Premiere, VLC Player, Handbrake and Quicktime with glitches/artifacts – location and frequency varies by player or program.

Troubleshooting: Playback in-camera has no glitch which led me to think that it's an issue with the Adobe MXF decoder. Same glitches when encoding in Adobe Media Encoder 2021 but the location of the glitches changes depending on the format. ProRes 422 showed best results with only one glitch occuring in the file. All programs up to date.

File specs:

Shooting on the Canon XF205 (playback in camera is clean)

Specs: @35Mbps MXF 4:2:0: 1920x1080 (30p)

Programs:

Glitches appear on all of my MXF files on import into the latest verisons of all programs below:

Premiere (2021), Handbrake, Quicktime and VLC player

Computer:

Mac OSX 11.3.1 / MacBook Pro 2019

Processor: 2.3 GHz 8-Core Intel Core i9

Memory: 16 GB

Graphics: AMD Radeon Pro 5500M 4 GB

M

Michael Grenadier

Legend

if it wasn't happening in an earlier version of premiere, revert to that version... Adobe is always working on these kinds of issues so testing the beta version or a newer update is always worthwhile...

I was having issues with mxf files that were using a different color space. When I modified/interpret the clips to color management: color space overrirde: rec709 the problems disappeared... worth a shot

M

Michael Grenadier

Legend

can you explain where the clips came from. Doesn't seem to make sense to me with the codec your clip uses, but this kind of problem is often seen when the source clip has a variable frame rate which is usually from a smart phone or screen recording program. You can use media info to check that the frame rate is constant

https://mediaarea.net/en/MediaInfo/Download

drop one of your source clips in the media info window and hover your cursor over the video area and you'll see all the specs of the source appear and it should tell whether the frame rate is constant or variable. If it's variable, you can use handbrake to convert to a constant frame rate

https://handbrake.fr

M

mmoracheAuthor

Participating Frequently

Thanks for the reply. That's good information, but I don't think it applies to this situation.

The clip has a constant frame rate. We are a daily local broadcast show, and we've never had problems with these edited clips that actually come out of fcp x, until we stopped posting at the tv station on the Sony Xpri software, and started posting from home on Premiere. I have a sample I can send you a link to.

It just seems strange to me that this clip looks fine in so many different platforms but shows a glitch when played in Premiere.

The information I get on the clip is:

Type: MXF File

Size: 31.15 MB Image Size: 1440 x 1080

Frame Rate: 29.97

Source Audio Format: 48000 Hz - 16-bit - 4 Channels

Project Audio Format: 48000 Hz - 32 bit floating point - 4 Channels

Total Duration: 00:00:08:19

Pixel Aspect Ratio: 1.3333

Alpha: None

MXF File details: Wrapper type: MXF OP1a (type: SingleItem SinglePackage MultiTrack Stream Internal)

File generated by: Apple Inc., Final Cut Pro X (10.4.8 (358560)) MPEG-2 420 MPHL

K

katcroft

Participant

Did you ever get this resolved? Facing the exact same issue.

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