🐛 After `pauseRecording()`, `stopRecording()` takes 4 seconds longer than if not paused about react-native-vision-camera

[mrousavy]

yea, this is a bug.

[thanhtungkhtn]

Any update on this? facing similar issue

"react": "18.2.0",
"react-native": "0.74.1",
"react-native-vision-camera": "^4.0.3"

[mrousavy]

No update yet, if you want me to fix this for ya, contact me thru my agency or sponsor this issue.

[mrousavy]

Hey all!

I just spent a few days on thinking about a battleproof timestamp synchronization solution, and I came up with a great idea.
I built a TrackTimeline helper class which represents a video or audio track - it can be started & stopped, paused & resumed, and even supports nesting pauses without issues.

• The total duration of the video is summed up from the difference between the first and the last actually written timestamps, minus the total duration of all pauses between a video. No more incorrect video.duration! 🥳
• Whereas before I just had a 4 second timeout if no frames arrive, I now just wait twice the frame latency (a few milliseconds) to ensure no frames are left out at maximum! 🎉
• A video can be stopped while it is paused without any issues, as a pause call is taken into consideration before stopping 💪
• A video file's session now exactly starts at the start() timestamp, and ends at the exact timestamp of the last video frame - this ensures there can never be any blank frames in the video, even if the audio track is longer 🤩

This was really complex to built as I had to synchronize timestamps between capture sessions, and the entire thing is a producer model - a video buffer can come like a second or so later than the audio buffer, but I need to make sure the video track starts before the audio track starts, and ends after the audio track ends - that's a huge brainf*ck! 🤯😅

There's also no helper APIs for this on iOS, and it looks like no other Camera framework (not even native Swift/ObjC iOS Camera libraries) support this - they all break when timestamps have a delay (e.g. video stabilization enabled) (or dont even support delays at all) ; so I had to build the thing myself.

Check out this PR and try if it fixes the issue for you; #2948

Thanks! ❤️