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• ffmpeg encoding plays very fast. Audio.mp4 and Video.mp4 work, but both together don't

  25 février 2013, par Peter.O

  In both steps 3 and 4 below, the .mp4 plays normally. However, although I've used what seems to be the same settings in the last step (audio + video), that step does not work. The video plays more than 10 times too fast... also the audio does not play.

  The ffmpeg messages for step 5 show that it has included audio.

  Output #0, mp3, to '/tmp/test.mp4':
  
      Stream #0.0: Video: libx264, yuv420p, 720x480, q=2-31, 90k tbn, 23.98 tbc
  
      Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, s16, 128 kb/s

  Subsequently running ffmpeg -i shows no trace of the audio, but it does report on the video... What have I missed, to get it muxed properly ?...

  #!/bin/bash
  
  
  
  # 1. create Audio 
  
  wine avs2pipe.exe audio "$src_avs" >"$temp_pcm"
  
  
  
  # 2. create Video 
  
  wine avs2yuv.exe "$src_avs" - |
  
    x264 --stdin y4m --output "$temp_h264" - 2>/dev/null
  
  
  
  # 3. This works.  (audio only)
  
  # encode `audio.mp4 
  
  ffmpeg -acodec pcm_s16le -f u16le -ac 2 -ar 48000 -i "$temp_pcm" \
  
         -acodec libmp3lame -f mp3 -ar 48000 -ab 128k  -y "$audio_mp4"
  
  
  
  # 4. This works.  (video only)
  
  # encode `video.mp4 
  
  ffmpeg -i "$temp_h264" \
  
         -vcodec copy -y "$video_mp4"
  
  
  
  # 5. This DOES NOT work!  It plays very fast.
  
  # encode `final.mp4' 
  
  ffmpeg -acodec pcm_s16le  -f u16le  -ac 2 -ar 48000  -i "$temp_pcm" \
  
         -i "$temp_h264" \
  
         -acodec libmp3lame -f mp3 -ar 48000 -ab 128k \
  
         -vcodec copy \
  
         -y "$final_mp4"

• Processing video using ffmpeg and saving the output to MongoDB

  10 juillet 2013, par kheya

  I have user uploaded video saved in a folder (can be in any of 5/6 formats)
  I have 2 needs.

  • Extract 3 frame images (that I will show to user for possible thumbnail
  • Convert the video to one or more other formats (flv + WebM)

  I am planning to use FFMPEG command line tool.

  How do I write the output from FFMPEG to MongoDB gridFS ?

  Is it even possible or I have to write the files to folder first & then save to gridFS ?

  Thanks

• ffmpeg. I correct that to insert the logo [closed]

  13 mai 2012, par user1390921

  private void btnStart_Click(object sender, EventArgs e)
  
   {
  
   this.btnStart.Enabled = false;
  
   this.progressBar1.Value = 0;
  
  
  
   string srcFile = Path.Combine(this.txtSource.Text, this.lstFiles.SelectedItem.ToString());
  
   MessageBox.Show(srcFile);
  
   string dstFile = Path.Combine(this.txtOutput.Text,
  
   Path.GetFileNameWithoutExtension(this.lstFiles.SelectedItem.ToString())) + "." + this.cboOutputFormat.SelectedItem;
  
   MessageBox.Show(dstFile);
  
   string imafile = Path.Combine("movie= "+this.openFileDialog1.SafeFileName);
  
   MessageBox.Show(imafile);
  
  
  
  
  
  
  
              string videoRateOption = string.Empty;
  
   if (this.cboVideoRate.SelectedIndex != 0)
  
   {
  
   videoRateOption = " -b:v " + this.cboVideoRate.SelectedItem.ToString().Split(' ')[0] + "k ";
  
   MessageBox.Show(videoRateOption);
  
   }
  
  
  
   string videoSizeOption = string.Empty;
  
   if (this.lstVideoSize.SelectedIndex != 0)
  
   {
  
   videoSizeOption = " -s " + this.lstVideoSize.SelectedItem.ToString().Split(' ')[0] + " ";
  
   }
  
  
  
  
  
              this.Text = "Converting...";
  
   ThreadPool.QueueUserWorkItem((object state) =>
  
   {
  
   ConvertFile(srcFile, imafile, dstFile, videoRateOption, videoSizeOption);
  
   });
  
   }
  
  
  
  
  
  string strFFMPEGOut;
  
   ProcessStartInfo psiProcInfo = new ProcessStartInfo();
  
   TimeSpan estimatedTime = TimeSpan.MaxValue;
  
  
  
   StreamReader srFFMPEG;
  
  
  
                  string ste = ""movie=watermarklogo.png [wm];[in][wm] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]"";
  
   string strFFMPEGCmd = " -i "" + srcFile + "" -ar 44100 " + videoRateOption + videoSizeOption +"-vf"+ ste + "-y ""
  
   + dstFile + """;
  
  
  
   psiProcInfo.FileName = Application.StartupPath + ((IntPtr.Size == 8) ? "\x64" : "\x86") + "\ffmpeg.exe";
  
   psiProcInfo.Arguments = strFFMPEGCmd;
  
   psiProcInfo.UseShellExecute = false;
  
                  psiProcInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
   psiProcInfo.UseShellExecute = false;
  
   psiProcInfo.RedirectStandardError = true;
  
   psiProcInfo.ErrorDialog = true;
  
   psiProcInfo.RedirectStandardOutput = true;
  
   psiProcInfo.CreateNoWindow = true;
  
  
  
   prcFFMPEG.StartInfo = psiProcInfo;
  
  
  
   prcFFMPEG.Start();

  There is no response that I push the start button that I tried to fix the code that I inserted the logo in the movie with Ffmpeg. Is that be okay if I don't choose the path of logo File. and Is there any something wrong that I did.