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• Rails Thumbnails for videos being uploaded to S3

  20 octobre 2015, par Dani

  I have a rails application where I need to upload videos to an amazon s3 bucket alongwith their thumbnails. I am using ffmpeg to generate thumbnails and I am using carrierwave to handle video uploads. Here is my video uploader class

   class VideoUploader < CarrierWave::Uploader::Base
  
    include CarrierWave::Video
  
    storage :fog
  
    def store_dir
  
       "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
    def extension_white_list
  
      %w(mp4 flv)
  
    end
  
  end

  The video uploads fine and the column for video url is set in videos table but I want to generate thumbnail and upload it as well. I know I have to use ffmpeg here but don’t exactly know how to do it.

  Any help will be appreciated.

• No such file or directory : 'ffmpeg' on MacOS in Python

  22 novembre 2023, par Harper Bledsoe

  I am using MacOS (Apple Silicon) and I am trying to use the whisper module from OpenAI in Python. My code is this :

  


  import whisper

file_path = "4547.mp3"
model = whisper.load_model("base")

result = model.transcribe(file_path)
print(result["text"])


  


  When running that code I get the error :

  


  FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg': 'ffmpeg'


  


  I think it is because Python is looking in the wrong folder for ffmpeg and therefore can't find it, but I don't know how to fix that if that is the issue.

  


  I have installed homebrew and used the command 'brew install ffmpeg' and it has successfully installed with no errors. I have tried uninstalling ffmpeg and reinstalling it. I have tried uninstalling open_whisper but to no avail.

  


• c# ffmpeg encode/decode audio and video

  31 juillet 2017, par IC.Fulvio

  I’m writing C# code to stream audio and video through RTSP. I use ffmpe.Autogen wrapper and NAudio. With the video I have no problem, hevc 25fps.

  About audio, I capture audio samples with NAudio and after, I copy the buffer in the AVframe data of ffmpeg. The audio codec that I use is : AAC f32le 44,1 khz. When I encode, in the main loop, I write one video frame and after one audio frame.

  while (video_st != null)
  
          {
  
  
  
              img1.CopyTo(imgframe);
  
              var startFrame = DateTime.Now;
  
  
  
              ret = Utility_ffmpeg.write_video_frame(outContext, video_st, frameCount, &dst_picture, frame, ref imgframe, sws_ctx);
  
  
  
              if (ret < 0)
  
              {
  
                  Debug.WriteLine("Write video frame failed.\n");
  
                  return;
  
              }
  
  
  
              var streamDuration = DateTime.Now - startSend;
  
  
  
              //audio
  
              if (enable_audio && srcAudio.audio_buff != null)
  
                  {
  
  
  
                  if (srcAudio.audio_buff_dim > 0)
  
                  {
  
                      lock (srcAudio.audio_buff)
  
                      {
  
                          frameCount++;
  
                          Utility_ffmpeg.write_audio_frame(outContext, srcAudio.audio_buff, srcAudio.audio_buff_dim, audio_st, frameCount);
  
                      }
  
                  }
  
              }
  
  
  
              Debug.WriteLine("Elapsed time " + streamDuration + ", video stream pts " + video_st->pts.val + ".\n");
  
  
  
              var frameDuration = DateTime.Now - startFrame;
  
              Debug.WriteLine(frameDuration+" total \n");
  
              //System.Threading.Thread.Sleep((int)((long)1000.0 / (long)STREAM_FRAME_RATE - (long)frameDuration.TotalSeconds));
  
              System.Threading.Thread.Sleep(40);
  
  
  
              //}
  
          }

  When I decode the video all is ok but the audio comes and goes. The synchronization is ok.
  I think the problem is that I need to send more audio frame then video, but I’m not sure. Someone has an idea about the origin of the problem ?
  Thanks in advance and sorry for my English.