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• Flutter app crashes in release mode when initializing FlutterFFmpegConfig() ;

  18 février 2021, par Mahmoud Eidarous

  The app is working on Android on Debug mode(only) with no errors in the logcat/terminal.
But when I tested it on iOS (even in debug mode), it crashes on a specific page.
After long tests, I could know that this line was causing the app to crash.

  


  FlutterFFmpegConfig _flutterFFmpegConfig = FlutterFFmpegConfig();


  


  If I comment that line, the app won't crash, but I need that line to manipulate videos in the app.

  


  I'm using flutter_ffmpeg: ^0.3.0 in pubspec.yaml, and full-gpl package is set in android\build.gradle

  


  ext {
    flutterFFmpegPackage  = "full-gpl"
}


  


  Related package initializations code snippet :

  


  final FlutterFFmpegConfig _flutterFFmpegConfig = new FlutterFFmpegConfig();
final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
final FlutterFFprobe _flutterFFprobe = new FlutterFFprobe();


  


  I'm not sure, but it seems like the app can't handle creating all these objects at the same class !
Anyone familiar with this problem ?

  


• Problems cropping videos with ffmpeg -ss -t

  8 décembre 2016, par Alex Bollbach

  I have been trying to figure out how to precisely crop out sub-sections of a video final.mp4, for example a cropped video with range [0.2, 0.28] or [9.1, 10.2]. So I’ve been using ffmpeg with -ss and -t options. The following command (or some similar form) is what I’ve seen prescribed :

  ffmpeg -y -i final.mp4 -ss 00:00:01 -t 00:00:01.5 -acodec copy -vcodec copy crop1.mp4

  What I expect is a cropped video of length 1.5 starting at time 1.0, but I get a broken video that doesn’t play. Or I’ll try :

  ffmpeg -y -i final.mp4 -ss 1 -c copy -t 1.5 crop1.mp4

  and get a video with the audio cropped to 1.5 seconds but the video lasting much longer freeze framed.

  The point is this should be a relatively straightforward operation but I’m running into problems at every turn. What is wrong with these commands ? My original video is a 7 minute youtube ripped mp4 which I trimmed down to 10 seconds (this seemed to work). But now further finer-grain trimming of that video is showing confusing behavior. Perhaps my video file is somehow in a bad state from the first trimming ?

• ffmpeg scale filter takes too long

  17 juin 2020, par Prashant_Sarin

  I am using below command to scale and blur a video but it is very slow. Can anyone please help if i can improve the speed somehow.

  



  "ffmpeg -i $inputPath -lavfi [0:v]split=2[original][copy];[copy]scale=ih*16/9:-1,crop=h=iw*9/16,boxblur=luma_radius=50:chroma_radius=25:luma_power=2[blurred];[blurred][original]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2[final] -map [final] -map a:0 -g 2 -preset ultrafast $outputPath -y"