SUMMARY Adding multiple video files, or cutting a single file and then trying to add more than one video effect to that piece, causes the preview to become distorted (like and old TV with UHF antenna) and the rendered file will produce a black screen for that section of the video. Additionally, trying to apply an effect such as White Balance to a files pieces, after it has been cut up, will produce the same problem/error. The workaround for this, is to apply the effect before clipping/editing the video file in the editor. This will prevent it from happening. I do not have a workaround for this when trying to apply White Balance, or any other effect to separate video files in the same project. The problem also exists when applying Brightness and Contrast, or Gamma, and <insert effect>. Essentially any two or more visual effects. STEPS TO REPRODUCE 1. Add video file to project. 2. Drag to tracks. 3. Clip file into two or more sections. 4. Apply effect to one section, then apply to the next section. 5. Render. OBSERVED RESULT Result = second section will be black screen. EXPECTED RESULT Visible picture start to finish. 2ND ALTERNATE SCENARIO SAME BUG STEPS TO REPRODUCE 1. Add 2 video files to project. 2. Drag files to tracks. 3. Apply effect to one file. 4. Apply to the next file. 5. Render. OBSERVED RESULT Result = second section will be black screen. EXPECTED RESULT Visible picture start to finish. 3RD ALTERNATE SCENARIO SAME BUG STEPS TO REPRODUCE 1. Add video file to project. 2. Drag file to tracks. 3. Apply visual effect to file such as White Balance. 4. Apply Brightness to same file. OBSERVED RESULT Preview screen becomes distorted and unable to play video properly. Render is corrupted. EXPECTED RESULT Visible picture in preview window with applied effects. Properly rendered file with both effects in place. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Linux Mint 19.3 - Cinnamon 4.4.8 - Kernel 5.3.0-53-generic (available in About System) KDE Plasma Version: KDE Frameworks Version: 19.12.3 Qt Version: ADDITIONAL INFORMATION CPU - Intel© Core™ i3-6100 CPU @ 3.70GHz × 2 RAM - 31.3 GiB GPU - NVIDIA Corporation GP106 [GeForce GTX 1060 3GB]
Created attachment 129093 [details] Photo example This is Alternate Scenario 3 example
This seems like a movit issue, are you using it? It seems very similar to this upstream issue: https://github.com/mltframework/mlt/issues/537 Can you test if it happens in latest appimage version?
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!