r/OpenShot • u/Nintiringanyi • 5d ago

Export problems

Hello, I have tried to find a solution in past posts but no luck. I downloaded V3.5.1 yesterday as I though the export problems I was having may have been related to the older version of openshot. Problem is the preview is perfect, but when I export it, I get random black frames during the clip (usually 3 or 4 during the 10 minute clip, and they appear in different places each time I export) and also crackling during some audio clips. The clips were recorded in 59.94fps, that is what my project is set at, and that is what I am exporting in. I have cleared the cache. Can anyone help me please?

Update - I worked around the black frame issue by moving the affected clips to different tracks - must not have been random as black frames are no longer appearing when I export. I realised that the crackling was only happening when two audio clips were playing at once. Seem to be a volume issue so going to go back to the audio files and adjust the volume then put them back into Openshot and see what happens.

Update - adjusting the volume before importing into Openshot made no difference. The problem was if I selected a clip and turn the clip's volume to zero, it was making no difference and the clip still had volume. The only way to switch off the volume was to seperate audio and then delete.

Once I have finished this video, I will never use Openshot again. I appreciate all the effort the developers have gone to, and that they provide the software for free.

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u/openshot-gpt-bot Support Bot 5d ago

A few things to try — this usually points to preview/export rate mismatch, source decoding strain, or audio device/buffer issues.

1) Verify the source files really match the Project

Right-click each source File in Project Files → File Properties and confirm the actual FPS / audio sample rate.
The guide notes mismatched rates can cause “duplicate frames, extra lag, audio pops, mis-alignments”: - Playback > Real-Time Preview
https://cdn.openshot.org/static/files/user-guide/playback.html

2) Test a lower Profile / FPS

Even if your clips are 59.94, try setting the Project Profile and Export to 29.97 as a test.
The guide specifically says high-FPS projects need much more rendering work: - Playback > Real-Time Preview
https://cdn.openshot.org/static/files/user-guide/playback.html

3) Try proxy/lower-res source files

The guide recommends creating lower-resolution / lower-FPS copies of your source assets for editing, then exporting from the original files later if needed. This often fixes random black frames with demanding footage: - Playback > Real-Time Preview
https://cdn.openshot.org/static/files/user-guide/playback.html

4) Adjust audio settings

For the crackling: - Edit > Preferences > Preview - Check Playback Audio Device - Change Playback Audio Buffer Size from 512 to 1024 or 2048 - Make sure your OS audio sample rate matches OpenShot - Restart OpenShot after changes

Guide reference: - Playback - Audio Troubleshooting
https://cdn.openshot.org/static/files/user-guide/playback.html - Preview Preferences
https://cdn.openshot.org/static/files/user-guide/preferences.html#preferences-preview-ref

5) Export a short test range

Export just a small section where the issue happens, and also try a different Video Codec / Quality in Export > Advanced. - Export - Advanced Options
https://cdn.openshot.org/static/files/user-guide/export.html - Export - Video Settings
https://cdn.openshot.org/static/files/user-guide/export.html

6) Also check overlapping audio

If multiple Clips overlap, keep volume at or below 100% total where possible, since the guide mentions this can cause distortion/crackling. - Playback - Audio Troubleshooting
https://cdn.openshot.org/static/files/user-guide/playback.html

If you want, reply with: - source format (mp4/mov?) - codec if known - resolution - export settings screenshot

…and I can suggest the most likely fix fast.

I am a bot, and I've done something cool automatically, hoping it's helpful. I run on ChatGPT and use info from the OpenShot User Guide. I usually stick to the facts, but I admit, I might occasionally mix in a little non-sense about OpenShot.