Video glitch/blocks during standard cross-fade, 1080p .MP4 AVC footage

RedRob-CandlelightProdctns wrote on 4/26/2025, 5:52 PM

While editing (and rendering) clips for a BTS reel, I had something new happen today. (Win 10, Latest Vegas build)

During two specific transitions between clips, the video glitched.. got blocky. I could see it most of the time in the timeline/preview. Definitely saw it on the renders. Same camera we've been using all season to film BTS. All the events are using media from the same camera. There are no video effects on the events where this is happening, no media effects, only a light Sharpen on the track.

I tried enabling and disabling Legacy Decoding -- still happened. (although the preview got blocky way more often with one over the other, even in other places). I tried rebooting -- no difference.

Setting the Hardware Decoder to "OFF" solved the problem.

Video is AVC High @ L4.2, CABAC / 2 Ref Frames, GOP: M=3, N=30, Codec ID: 27, Variable bitrate 1080p60

I've not seen this behavior before... wondering what may have changed with Windows update, Vegas, or anything else.

Anyone else experiencing similar?

Left is using hardware decoder (RX470), Right is hardware decoder OFF. These are from the rendered 1080p60 files (I dropped onto the timeline to align and screen-grab)

Comments

john_dennis wrote on 4/26/2025, 6:16 PM

I haven't seen it, but my RX480 is lying on the floor behind my chair. I keep thinking I'm going to roll over it one day.

Vegas Pro 22-239 on Windows Pro 10.

RedRob-CandlelightProdctns wrote on 4/26/2025, 6:25 PM

Oh -- it isn't happening on *most* of my frames or *most* of my transitions. Just in two spots!

Gid wrote on 4/26/2025, 9:08 PM

@RedRob-CandlelightProdctns I have seen similar in other posts,

This one

& there's a link to someone who posted something similar

fifonik wrote on 4/26/2025, 9:13 PM

Never seen this and ALL my fragments connected with disolve transition (I used to have RX470, but not any longer, last few years I'm using RX6600). My foorage over last few years was AVC 1080 or 4K both 60p (only ~6 months ago I started to record in HEVC 4K).
Is it triggered by transition or the blocking everywhere on begin/end of your fragments (and so visible on the transitions)?

I'd try to roll back graphics driver to older version.

Have you considered to create proxy as a temporary solution (I personally never used proxy when working on 1080)?

RedRob-CandlelightProdctns wrote on 4/26/2025, 9:51 PM

@fifonik My temp solution was setting Hardware Decoding to OFF -- then it all worked fine.

I use proxies frequently to make editing 9-ups with 4K mixed content smoother, but this was literally single-track BTS footage, all 1080p60, so really no proxy was needed.

For the render -- the blocking was not everywhere. Just in two spots on the timeline at the transition points.

On the editing/timeline -- depending on my Legacy Decode setting, I was (or wasn't) getting blocks mid-clips too (not just on the crossfade).

RedRob-CandlelightProdctns wrote on 4/26/2025, 10:03 PM

@RedRob-CandlelightProdctns I have seen similar in other posts,

This one

& there's a link to someone who posted something similar

The first thread definitely is my experience today. One commented noted he was using footage shot on his Canon XA10 -- this happened to me today with footage from my XA11 -- a coincidence? Maybe.. maybe not?

Disabling hardware decoding was his workaround as well. :-/

Reyfox wrote on 4/28/2025, 6:08 AM

Glad you found a solution, but curious as to which driver version you are using? 24.9.1 is the latest listed. From my understanding, the Polaris cards are EOL (end of life) without any more driver updates. Like @john_dennis, my RX480 has been in the closet for some time now. But even then, when I was using the RX480, I never saw that issue. But I also do not us a Canon camera. Using the RX 6700XT now.