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• How to switch from yuyv422 to yuv420p for better framerate in ffmpeg on Windows 10

  14 mai 2019, par someone from belgium is called

  I upgraded PC from Windows 7 to Windows 10, as it is discontinued. Problem is,
  I had low latency monitoring and recording solution with FFmpeg.

  After the upgrade, Logitech camera switched from yuv420p to yuyv422 and I lost 30 fps support at 1280x720. Now it is only limited to 10 FPS.

  Tried different drivers, it still yuyv422

  Here is a code i use.

  ffmpeg -y -loglevel panic -hwaccel qsv -threads 1 -fflags nobuffer -flags low_delay -strict experimental -f dshow -video_size 1280x720 -framerate 10 -pixel_format yuyv422 -i video="C922 Pro Stream Webcam" -codec:v libx264 -preset ultrafast -crf 24 -tune zerolatency -map 0 -f segment -segment_time 600 -segment_wrap 2 -reset_timestamps 1 dvr_%%04d.avi -codec:v copy -f nut - | ffplay -fflags nobuffer -flags low_delay -vf scale=1920x1080:flags=lanczos -window_title "kamera" -noborder -left 1920 -top 150 -fast -framedrop -

  I really need low CPU, no latency monitoring at minimum 24 FPS and recording capabilities. File size doesn’t matter so much.

  Using mjpeg eats CPU like crazy.

• Adding Text to Video with ffmpeg in Flutter

  9 mars 2024, par Aiman

  I am trying to add text to a video using ffmpeg package but it returns an error i.e. Return Code 1
Here's my code.

  


    final videoPath = _controller.file.path;
  final outputName = videoPath.hashCode.toString();

  final output =
        File('${(await getTemporaryDirectory()).path}/$outputName.mp4');

  String command =
        "-y -i $videoPath -filter_complex '[0]scale=540:-1[s];[s]drawtext=fontfile=/storage/emulated/0/Download/SuperDessert.ttf:text='MY_TEXT':fontsize=24:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2' ${output.path}";

  final session = await FFmpegKit.execute(command);

  final returnCode = await session.getReturnCode();

  if (ReturnCode.isSuccess(returnCode)) {
    log("Success full text added");
  } else {
    log("Error adding text: ${await session.getFailStackTrace()}");
  }


  


  I have tried changing the output directory, changed fontfile to font

  


• File Decryption in (AESMode.ctr) mode showing Exception Failed to decode data using encoding 'utf-8' in dart ?

  20 novembre 2020, par Jai

  While decoding the video file using aes-ctr mode am getting error like below,

  


  Unhandled Exception: FileSystemException: Failed to decode data using encoding 'utf-8'

  


  Used ffmpeg for encrypting file :

  


  ffmpeg -i samplevideo.mp4 -vcodec copy -acodec copy -encryption_scheme cenc-aes-ctr -encryption_key 76a6c65c5ea762046bd749a2e632ccbb -encryption_kid a7e61c373e219033c21091fa607bf3b8 enc_v1_file.mp4

  


  Used Dart to decode video file :

  


  Future<string> decryptFile(filePath) async {&#xA;    // filePath - Local encrypted file path&#xA;    var encodedKey = &#x27;NzZhNmM2NWM1ZWE3NjIwNDZiZDc0OWEyZTYzMmNjYmI=&#x27;;&#xA;    var encodedIv = &#x27;YTdlNjFjMzczZTIxOTAzM2MyMTA5MWZhNjA3YmYzYjg=&#x27;;&#xA;    var encryptedBase64EncodedString = new File(filePath).readAsStringSync();&#xA;    var decoded = base64.decode(encryptedBase64EncodedString); // Error in this line&#xA;    final key1 = enc.Key.fromBase64(encodedKey);&#xA;    final iv = enc.IV.fromBase64(encodedIv);&#xA;    final encrypter = enc.Encrypter(enc.AES(key1, mode: enc.AESMode.ctr));&#xA;    final decrypted = encrypter.decryptBytes(enc.Encrypted(decoded), iv: iv);&#xA;    final filename = &#x27;${p.basenameWithoutExtension(filePath)}.mp4&#x27;;&#xA;    final directoryName = p.dirname(filePath);&#xA;    final newFilePath = p.join(directoryName, filename);&#xA;    var newFile = new File(newFilePath);&#xA;    await newFile.writeAsBytes(decrypted);&#xA;    return newFilePath;&#xA;}&#xA;</string>