j2bmw
commented
3 years ago The issue has been resolved. See details in https://github.com/Laerdal/Laerdal.Xamarin.FFmpeg/issues/2
Closed j2bmw closed 3 years ago
j2bmw
commented
3 years ago The issue has been resolved. See details in https://github.com/Laerdal/Laerdal.Xamarin.FFmpeg/issues/2
Description Our app is to convert video files in a Xamarin forms project. On Android, FFmpeg.Execute() locks app on Visual Studio debugger and seems cause a crash after reopening a page. Note that:
I use the wrapper of mobile ffmpeg: https://nugetmusthaves.com/Package/Laerdal.Xamarin.FFmpeg.Video No lock up if running the command line outside the debugger. The crash occurs inside and outside the debugger. Expected behavior There should be no lockup or crash inside or outside the debugger.
Current behavior
FFmpeg.Execute() locks app inside Visual Studio debugger on Android. The app crashes after running the command line, exiting a page and opening another page. It occurs inside and outside the debugger. Screenshots No
Logs crash after converting to mp4.txt
Environment
Visual Studio 2019 16.8.4 Platform: Xamarin Forms 5 Architecture: [Android pixel 3 Q] Other Our app is to convert video files in a Xamarin forms project. On Android app, running ffmpeg command line locks the app on Visual Studio debugger. However, the conversion seems completed (at least a significant portion is done and can be played back) outside the debugger without locking the app. The bigger problem: after the conversion, the app crashes not long after. Please see the device log "crash after converting to mp4.txt" crash after converting to mp4.txt. It seems the conversion didn't complete and it triggered the following exception: 02-12 19:04:18.635 Google Pixel 3 Error 23366 libc Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 23470 (x.tecommobilev2), pid 23366 (x.tecommobilev2) 02-12 19:04:18.624 Google Pixel 3 Error 23366 libc FORTIFY: pthread_mutex_lock called on a destroyed mutex (0x77f6994c30)
It seems this crash is related to int rc = FFmpeg.Execute($"-i "{filename}" "{mp4File}"");
If I comment out this line, there is no crash. I haven't figured out the cause.
I tried the alternative using long rc = Laerdal.Xamarin.FFmpeg.Android.FFmpeg.ExecuteAsync($"-i "{_recordedVideoFileName}" "{mp4File}"", executeCallback);
The issue remains.