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• avformat/mov : add option max_stts_delta

  27 novembre 2021, par Gyan Doshi

  avformat/mov : add option max_stts_delta
  Very high stts sample deltas may occasionally be intended but usually
  
  they are written in error or used to store a negative value for dts correction
  
  when treated as signed 32-bit integers.
  This option lets the user set an upper limit, beyond which the delta is clamped to 1.
  
  Values greater than the limit if negative when cast to int32 are used to adjust onward dts.
  Unit is the track time scale. Default is UINT_MAX - 48000*10 which
  
  allows upto a 10 second dts correction for 48 kHz audio streams while
  
  accommodating 99.9% of uint32 range.
  Signed-off-by : Gyan Doshi <ffmpeg@gyani.pro>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] doc/demuxers.texi
  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c

• MobileFFmpeg - get progress of concatenation of a video

  18 mai 2020, par STerrier

  Is there a way to grab the progress of the concatenation using Mobile FFmpeg ? Mobile FFmpeg displays stats by default in the console and I can see the time length of the video which I want but I can't find a way to grab it so I can create a progress bar.

  



  Data displayed in the console
2658560kB time=01:30:40.00 bitrate=4003.5kbits/s speed=60.9x \rframe=137002 fps=1524 q=-1.0
2678272kB time=01:31:20.00 bitrate=4003.7kbits/s speed=61x \rframe=138252 fps=1528 q=-1.0

  



  func encodeWebp(m3u8: String, completed: () -> Void){
    guard let sessionid = sessionID else {return}

    let lastName: String = m3u8
    let docFolder = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    let output = URL(fileURLWithPath: docFolder + "/OfflineSession/\(sessionid)").appendingPathComponent("\(lastName).mp4")
    let outputTxt = URL(fileURLWithPath: docFolder + "/OfflineSession/\(sessionid)").appendingPathComponent("\(lastName).txt")
    let fileName = "\(m3u8)_ffmpegData.txt"
    let textFile = URL(fileURLWithPath: docFolder).appendingPathComponent("OfflineSession/\(sessionid)/\(fileName)")

    let ffmpegCommand = "-f concat -i \(textFile) -c:v copy -c:a copy \(output) -progress \(outputTxt)"

    MobileFFmpeg.execute(ffmpegCommand)

    completed()

}


  



  GITHUB - Mobile FFmpeg
https://github.com/tanersener/mobile-ffmpeg

  


• VB.NET : How to maintain main form control during loops in other sub ?

  5 février 2015, par Zed Machine

  I have a program with only one form.
  By pressing a button it starts a ffmpeg conversion.

  In the main form, in textboxes, ffmpeg stats are outputted. This is possible by taking StandardError output from ffmpeg.

  Public Sub Console()
  
          Dim Process As New Process 
  
  
  
          Process.StartInfo.UseShellExecute = False
  
          Process.StartInfo.RedirectStandardError = True
  
          Process.StartInfo.RedirectStandardOutput = True 
  
          Process.StartInfo.FileName = current_ffmpeg_path 
  
          Process.StartInfo.Arguments = input_params 
  
          Process.StartInfo.CreateNoWindow = True 
  
          Process.Start() 
  
  
  
          Dim ffmpeg_stats_output As System.IO.StreamReader = Process.StandardError
  
  
  
          Do While Process.HasExited = False
  
          [update all main form textboxes by taking input string from ffmpeg and elaborate it]
  
          Loop
  
  End Sub

  The problem is that while this loop is executed the textboxes and progress bar are updated but the main form cannot be modified. There is in fact no control at all by user. So if I want to make a button to stop/pause ffmpeg in main form this cannot be pressed as anything else on the main form.

  there is a way to maintain loops inside other Sub without loose control of main form while they’re running ?

  I tried to fix it by calling another dialog form with textboxes and progress bar. But even this form loose completely control until the process is finished.

  To send pause/stop conversion to ffmpeg (that runs without a window) is it correct use :

  Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
  
  SendKeys.Send("q")
  
  SendKeys.Send("^s") 
  
  End Sub

  or must be specified that this key is sent to the current running Process ?