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• flutter_ffmpeg - Can we trim a part of the video in flutter while recording

  16 février 2021, par Mayur Agarwal

  I am making a flutter app, in which a user can record a video and pause in between, and when the user pauses the video a clip is formed.
So if the 4 clips are there, then 4th clip can be removed from the video (according to the time of the last clip).
By a clip I just mean the time interval between two continuous pauses. The video is being recorded continuously.
There's a way to trim a video after it's being record, for example,

  


   ffmpeg -ss 00:01:00 -i input.mp4 -to 00:02:00 -c copy output.mp4


  


  But I think it's possible only when the video is recorded.

  


  So, Is there any way to to trim a video (using flutter_ffmpeg) or the last clip, while the recording is paused ?

  


• System.InvalidOperationException thrown when running as part of a WPF application. Xabe.FFmpeg

  16 mars 2021, par S. O. James

  I have the following code which runs on a console application

  


    string filePath = "C:\\Users\\**\\Desktop\\sample-mp4-file.mp4";
  string output1 = "C:\\Users\\**\\Desktop\\1.jpg";
  string output2 = "C:\\Users\\**\\Desktop\\2.jpg";
  var ms = new MultiSnapshotCommand(filePath);
  await ms.Add(TimeSpan.FromSeconds(20), output1);
  await ms.Add(TimeSpan.FromSeconds(20), output2);
  await ms.Invoke();


  


  Which uses the following

  


    public async Task Add(TimeSpan timestamp, string outputPath)
  {
      var conversion = await FFmpeg.Conversions.FromSnippet.Snapshot(filePath, outputPath, timestamp);
      conversionQueue.Enqueue(conversion);
  }


  


  This executes fine and both snapshots are created when calling Invoke().
However, when executing the same code running in an async method in response to a button click in a WPF scenario, the UI freezes, then a few moments later Exception thrown: 'System.InvalidOperationException' in System.Diagnostics.Process.dll is shown from the debugger output with no recovery.

  


  The error seems to be occurring at await FFmpeg.Conversions.FromSnippet.Snapshot(filePath, outputPath, timestamp);

  


  Original - https://github.com/tomaszzmuda/Xabe.FFmpeg/issues/341

  


  Edit

  


  My project files https://github.com/Scharps/MP4ToImageConverter/tree/05beeb1cc359b654fb51a9695b5c20386c4d5fb6.
FFmpeg is required in Path system variable. File locations will need to be changed also

  


• ffmpeg mkv to mp4 converter drops part of the audio, how to configure in python ?

  14 mars 2021, par user3486773

  I am converting several mkv files to mp4 via ffmpeg and python. However when I go to play them, the background audio is synced up perfect, but it's as if it's dropped all the voices. Is there a way to set all the audio to mono ?

  


  or how do I specify the number of channels ?

  


  The following audio and video settings work in vlc :

  


  video settings:
Codec = H-265
bitrate = 800 kb/s

audio settings:
Codec = MP3
bitrate = 128 kb/s
channels = 2
sample rate = 8000Hz


  


  my python code :

  


  import os
import ffmpeg
import glob

start_dir = os.chdir("C:/Users/Me/Downloads/")
files = [file for file in glob.glob("*.mkv")]

def convert_to_mp4(mkv_file):
    name, ext = os.path.splitext(mkv_file)
    out_name = name + ".mp4"
    ffmpeg.input(mkv_file).output(out_name).run()
    print("Finished converting {}".format(mkv_file))

print(os.getcwd())
for path, folder, files in os.walk(os.getcwd()):
    for file in files:
        if file.endswith('.mkv'):
            print("Found file: %s" % file)
            convert_to_mp4(os.path.join(os.getcwd(), file))
        else:
            pass