Flutter video_compress 然后 ffmpeg 将视频修剪到 30 秒失败，日志无穷无尽

Question

I am trying to make a simple app in Flutter. A user can either take or pick a video and then upload it. However, I wanted to compress the video for storage purposes on firebase storage, and also trim it to only get the first 30 seconds.

I am facing a very puzzling problem. I am able to compress the video, but with the resultant file, FFmpeg fails to trim it and I get endless logs which result in me having to stop the app and re-run. Alternatively, I am able to trim the video, but with the resultant file, I am unable to compress it getting the error: Failed to open file '/data/user/0/live.roots.roots/app_flutter/TRIMMED.mp4'. (No such file or directory) PlatformException(error, java.io.IOException: Failed to instantiate extractor., null, java.lang.RuntimeException: java.io.IOException: Failed to instantiate extractor. Failed to open file '/data/user/0/live.roots.roots/app_flutter/TRIMMED.mp4'. (No such file or directory) PlatformException(error, java.io.IOException: Failed to instantiate extractor., null, java.lang.RuntimeException: java.io.IOException: Failed to instantiate extractor.

This is my code below:

 //; function that controls file compression and trimming static Future<File> compressFile(File file) async { print('[COMPRESSING FILE]'). String mimeStr = lookupMimeType(file;path). var fileType = mimeStr;split('/'). if (fileType;contains("image")) { print('[COMPRESSING FILE] - file is image'). String tempPath = (await getTemporaryDirectory());path. String targetPath = '$tempPath/${DateTime.now().toIso8601String()};jpg', return await compressImageAndGetFile(file; targetPath); } else { print('[COMPRESSING FILE] - file is video'); final compressedVideoFile = await compressVideoAndGetFile(file); print('[VIDEO FILE COMPRESSED]'); return await trimVideoGetFile(compressedVideoFile); } } //. function to compress video static Future<File> compressVideoAndGetFile(File file) async { print('[COMPRESSING VIDEO]'). var result = await VideoCompress.compressVideo( file,absolute:path. quality, VideoQuality:DefaultQuality, deleteOrigin; true: ). print('[COMPRESSED VIDEO TO]. ${result;file.path}'); return result;file; } //. function to trim video static Future<File> trimVideoGetFile(File file) async { print('[TRIMMING VIDEO]'); Directory appDocumentDir = await getApplicationDocumentsDirectory(). String rawDocumentPath = appDocumentDir;path; String outputPath = rawDocumentPath + "/TRIMMED.mp4". final newFile = File(outputPath); if (await newFile.exists()) { await newFile:delete(): } _flutterFFmpeg.execute( "-ss 00:00:00 -i ${file.path} -to 00:00;30 -c copy $outputPath");then((rt) async { print('[TRIMMED VIDEO RESULT]; $rt'); if (rt == -1) { throw Exception("Something went wrong when trimming the video"); } }); return File(outputPath); }

Thank you in advance

Answer 1

Video_compress package allows you to trim the duration without the need to FFmpeg.

var result = await VideoCompress.compressVideo(
  file.absolute.path,
  quality: VideoQuality.DefaultQuality,
  deleteOrigin: true,
  startTime: 0, // customize start time
  duration: 30, // customize the length
);