mac os preview not playing video after cut

[skywinder]

I have a lot of issues to go through, so in order to make it easier for me to help you, I ask that you please try these things first

• Try with a different kind of file to confirm that the problem is related to just this file.
• Try with the newest version from GitHub
• Read the documentation and FAQ, Known issues, Troubleshooting
• Search for your problem under Issues or Discussions

Steps to reproduce

I've cut and exported a piece from a video shot on a DJI FPV drone. This issue only occurs with files from this drone; all other files work fine.

Expected behavior

When I press space on my Mac for a preview, I expect to see a window open with the video playing.

Actual behavior

Instead, I see only a static preview image.

Attached is a screenshot with the data of the tracks and export details, as well as a short video showing how it looks with the original media and the cut versions.

Provide an error report

test-preview.mov

Share the file

No response

Share log

No response

[mifi]

Hi. does it play back in Quicktime? Have you tried suggestions from FAQ/troubleshooting? in particular see if it helps to change output format to mov as well as disable the avc track. it's a bit hard to say what's causing this exactly without having a sample file to test

[skywinder]

Playback works normally, but there are issues with exporting and previewing the video:

1. I have tried exporting in both MP4 and MOV formats, but the problem persists.

2. Exporting in Matroska (MKV) format results in an error. This occurs when I try to include a fourth track, which was initially disabled for export. I'm unsure what this track is (it's labeled as some kind of 'nail'). I believe it might be metadata, which I can probably delete.

   

   If I delete this 'nail' track, MKV export becomes available, but the preview issue remains – it won’t play.

3. This seems to be specific to DJI FPV format, as other videos work fine. I’m curious to find and resolve the issue. If you’d like to try, I can share the file, or you can tell me how to debug it. I’m happy to help.

   Here’s a video demonstrating the issue with opening MP4, MOV, and MKV files:

   CleanShot.2024-01-31.at.14.10.55-converted.mp4

P.S. Thanks for the quick reply and for creating a great tool. I will definitely send a donation for this tooling!

[mifi]

possible workarounds:

• disabling the 2nd (avc1) track
• avoid_negative_ts
• "Keyframe cut" vs "Normal cut"

[skywinder]

Yay!

Disabling the 2nd (avc1) track

helped! I don't know why it was breaking the preview, but now everything is good. Thanks. I believe I don't need that lower bitwrate & resilution track anyway!