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• Using Mencoder to Convert Sequence of Images Sorted Numerically to Video

  7 décembre 2017, par txizzle

  I want to use mencoder to convert a sequence of PNG files to video. The PNG files are named like file1.png, file2.png, ... file1000.png. However, if I run this :

  mencoder mf://*.png -mf fps=25 -ovc copy -oac copy output.avi

  The resulting video will not stitch together the frames in the correct order (correct : 1,2,3,.... incorrect : 1, 10, 100, ...). Answers to a similar question suggest that I can manually input the range of frames to have mencoder use the correct numerical order :

  mencoder mf://file{1..1000}.png -mf fps=25 -ovc copy -oac copy output.avi

  or to manually sort the files with something like ls -v and then save the results to a list (say, list.txt), and then pass that into mencoder :

  mencoder mf://@list.txt -mf fps=25 -ovc copy -oac copy output.avi

  However, my question is : Is there a way to do this in a single command without specifying the last frame ?

  Ideally, I would want an equivalent to mf://file*.png that uses a numerical sorting as opposed to the default sorting. For example, ffmpeg has the option to specify input files like file%d.png, which would order the files numerically.

  Thanks !

• Displaying progress while working on FFMpegConverter ?

  1er novembre 2017, par GreenRoof

  During a part of my project, I should download video data and audio data of a youtube link and merge them using NReco.VideoConverter. So this here is my code :

  public class Download {
  
      public NReco.VideoConverter.FFMpegConverter ffMpeg;
  
      public BackgroundWorker bgWorker;
  
  
  
      public Download (BackgroundWorker bgWorker) {
  
          this.BgWorker = BgWorker;
  
          var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
          ffMpeg.ConvertProgress += (s, e) => ReportProgress(Convert.ToInt64(e.Processed.TotalSeconds), Convert.ToInt64(e.TotalDuration.TotalSeconds));
  
      }
  
  
  
      public MergeData() {
  
          // Video data and Audio data are downloaded to tempVidPath and tempAudPath.
  
          ffMpeg.Invoke(String.Format("-i \"{0}\" -i \"{1}\" -y -c copy \"{2}\"", tempVidPath, tempAudPath, targetPath));
  
      }
  
  
  
      public ReportProgress(long part, long total) {
  
          bgWorker.ReportProgress(0, new string[] {part.ToString(), total.ToString()});
  
      }
  
  }
  
  
  
  public partial class App : Form {
  
      //**omit
  
      public void Execution() {
  
          bgWorker = new BackgroundWorker(); // bgWorker is already defined in Designer class.
  
          bgWorker.WorkerReportsProgress = true;
  
  
  
          Download Dnld = new Download(bgWorker);
  
  
  
          bgWorker.ProgressChanged += (s, e) => {
  
              string[] arr = ((System.Collections.IEnumerable)e.UserState).Cast().Select(x => x.ToString()).ToArray();
  
              progBar.Maximum = Int64.Parse(arr[1]);
  
              progBar.Value = Int64.Parse(arr[0]);
  
          };
  
  
  
          bgWorker.DoWork += (s, e) => {
  
              Dnld.MergeData()
  
          }
  
  
  
      }
  
  }

  Here, I have no idea how to keep progBar to track the merging process while two files are being merged. Is there any method like WebClinet.DownloadFileAsync so I can get progress data from the thread ?

  ** I didn’t write unnecessary codes so codes may complicated and inefficient. But there are much more codes so please understand that problems. :)

• Merge commit 'ecc5c4db2dd3a0f328d95df89daa59f78b4b2810'

  30 octobre 2017, par James Almer

  Merge commit 'ecc5c4db2dd3a0f328d95df89daa59f78b4b2810'
  * commit 'ecc5c4db2dd3a0f328d95df89daa59f78b4b2810' :
  
    doc/examples/output : Cast pointer to the right (const) type
  Merged-by : James Almer <jamrial@gmail.com>
  

  • [DH] doc/examples/muxing.c