P: Glitching playback, including green flashes, during playback and export of 10-bit 4:2:2 Media on Windows

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Hello ​@matthewfhenry 

Welcome to the Premiere Forum and thank you for your Bug Report. I’m wondering if we could get more information on the file formats. Do you know what camera these are from, and could you include a screenshot of the Media file Properties? In fact, it could really help us to get samples of files presenting this problem in 26.5. Do you have a clip that had this issue you’d be willing to share with our engineering team? I could DM you a private upload link for it. 

We truly appreciate you bringing this to our attention and giving us an indication of where this issue was introduced. 

Best,

Amy

Issue Description:
Upon updating to Premiere version 26.5.0 (Build 99), I experienced severe playback performance issues. While the audio plays back perfectly fine and smoothly, the video track completely freezes, stutters, and outputs solid "green frames." This issue occurs consistently when trying to preview H.264 / HEVC video files on the timeline.

Disabling "H.264/HEVC hardware accelerated decoding" in Media Preferences acts as a temporary workaround. Rolling back entirely to a previous version (v26.4.0) resolves the issue completely out-of-the-box, confirming it is a regression specific to v26.5.0's hardware decoding engine.

System Specifications:

• OS: Windows 11
• GPU: Nvidia GeForce RTX 4070 SUPER
• GPU Driver: Latest Nvidia Studio Driver
• Premiere Version: v26.5.0 (Build 99)

Hello ​@kiwon291540894wxp 

Thank you for your Bug Report. We are wondering if you would be willing to share a test file that is exhibiting this issue for you. If you can, I will DM you a private upload link to share with our engineers. It would be much appreciated. I’m glad you found the workaround of disabling Intel hardware-accelerated decoding in Media Encoder. 

Hoping to help,

Amy

Has this been resolved? this is happening to me while using my canon c80 …. I have client projects and a deadline to fix and i cant seem to get it to work 

Issue: Random visual glitch artifacts (green/magenta tearing and horizontal macroblocking) appear at unpredictable timestamps on exported videos when rendering HEVC 10-bit 4:2:2 footage on a dual heterogeneous GPU setup (Intel Arc A380 + NVIDIA RTX 4070 Ti). Disabling Intel hardware-accelerated decoding in Adobe Media Encoder resolves the issue completely.

Steps to Reproduce:

1. Configure a Windows 11 system with an AMD Ryzen CPU (Ryzen 9 5950X), an Intel Arc discrete GPU (A380) for QuickSync decode, and an NVIDIA GPU (RTX 4070 Ti) set as the primary Mercury Playback Engine (CUDA) renderer.

2. Ensure Preferences > Media > Enable hardware-accelerated decoding (Intel) is checked in both Premiere Pro and Adobe Media Encoder.

3. Import Sony FX3 footage shot in XAVC HS 4K (HEVC 4:2:2 10-bit Long-GOP, 24p) into a sequence.

4. Apply basic Lumetri color grading and queue the sequence to Adobe Media Encoder.

5. Export to any master format (e.g., Apple ProRes 422 MOV or H.264/HEVC MP4).

6. Inspect the exported file.

Expected Result: The export completes with frame-accurate rendering, free of visual glitches or dropped frame buffers across the entire timeline.

Actual Result: Intermittent, random green/magenta pixel artifacts and macroblock tearing are baked into the rendered file. The glitch timestamps are non-deterministic and shift positions on subsequent exports of the exact same timeline.

Premiere Version: Premiere Pro 26.5 / Adobe Media Encoder 26.5

Operating System: Windows 11 Pro 24H2

GPU Driver:

• NVIDIA: Studio Driver 616.92 (RTX 4070 Ti)

• Intel: Arc Graphics Driver 32.0.101.8993 (Arc A380)

Video Format: Sony FX3 XAVC HS 4K (HEVC / H.265, 10-bit 4:2:2, 24.000 fps, Long-GOP)

Helpful Context & Technical Findings:

• System Configuration: AMD Ryzen 9 5950X (no iGPU), 64GB DDR4 RAM, Intel Arc A380 (installed specifically for hardware decoding 10-bit 4:2:2 HEVC, which NVIDIA NVDEC does not support), NVIDIA GeForce RTX 4070 Ti (CUDA render/NVENC encode).

• Scope: Affects all projects utilizing 10-bit 4:2:2 HEVC footage when decoded via the secondary Intel Arc GPU while the primary CUDA device handles rendering. It is not limited to a single clip or corrupted source file.

• Timeline vs. Export Behavior: Timeline scrubbing and real-time playback inside Premiere Pro work smoothly with Intel Arc hardware decoding enabled. The glitch only occurs during batch export/rendering where frame throughput is maximized.

• Verified Workaround: In Adobe Media Encoder, unchecking Intel under Preferences > Media > Hardware-accelerated decoding forces AME to fall back to CPU software decoding (via the 16-core 5950X). With CPU decoding, 100% of the exported files render flawlessly with zero artifacts across multiple passes.

• Suspected Root Cause: Cross-adapter memory synchronization failure (Race Condition). When the Intel Arc QuickSync engine uncompresses 10-bit 4:2:2 frames into its VRAM and transfers the uncompressed YUV/RGB buffers across the PCIe bus/system memory into the NVIDIA RTX 4070 Ti VRAM for CUDA processing, buffer underruns or frame packet drops occur under sustained export workloads, baking corrupted frame data into the output stream.

Hi ​@Serendipitous_friendd38a,

Welcome back to the Premiere forums. Thank you for reporting this occurrence and providing your reference video. The team was able to successfully reproduce this issue and will be filing a bug report.

As we work, the team suggests:

• Downgrading to 26.3.2

Sorry for the frustration.

Best,

Jonathan

Having the same issues. So you’re not alone here

In Premiere Pro 26.5, the Program Monitor occasionally flashes completely green for a split second during playback when editing Canon R5C MXF footage recorded in C-Log 3.

The issue occurs only with C-Log 3 footage. I tested multiple NVIDIA driver versions, including the latest driver and several previous versions, but the problem persisted.

When I downgraded to Premiere Pro 26.3.2, the issue disappeared completely. The same footage plays normally with no green flashes.

 

Issue:
Green flashing in the Program Monitor during playback of Canon R5C C-Log 3 MXF footage.

Steps to Reproduce:
Open Premiere Pro 26.5.
Create a new project.
Import Canon R5C footage recorded in MXF format with C-Log 3.
Create a sequence using the imported footage.
Play the footage in the Program Monitor.
During playback, the Program Monitor occasionally flashes completely green for a split second.

Expected Result:
The footage should play normally without any green flashing or visual artifacts.

Actual Result:
The Program Monitor occasionally flashes completely green for a split second during playback. The issue occurs with Canon R5C MXF C-Log 3 footage.

The same footage plays perfectly in Premiere Pro 26.3.2 on the same system, with no green flashes.

Screen Recording:
I can provide a screen recording showing the issue.

Premiere Version:
Adobe Premiere Pro 26.5

Operating System:
Windows 11 64-bit

GPU Driver:
NVIDIA Studio Driver [616.92]

Video Format:
Canon EOS R5 C, 4K UHD, MXF, C-Log 3, 10-bit 4:2:2. The issue occurs during playback of multiple Canon R5C MXF C-Log 3 files.