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• vvcdec : add CTU parser

  5 décembre 2023, par Nuo Mi

  vvcdec : add CTU parser
  Co-authored-by : Xu Mu <toxumu@outlook.com>
  
  Co-authored-by : Frank Plowman <post@frankplowman.com>
  
  Co-authored-by : Shaun Loo <shaunloo10@gmail.com>
  
  Co-authored-by : Wu Jianhua <toqsxw@outlook.com>
  

  • [DH] libavcodec/vvc/vvc_ctu.c
  • [DH] libavcodec/vvc/vvc_ctu.h

• Using more than 2 NV_ENC at a time with FFMPEG

  29 décembre 2022, par lowcrawler

  I'm currently generating timelapse videos using a thread on my CPU with fluent-ffmpeg running on nodejs. It takes roughly 1 minute to generate a 10 second timelapse. I'm generating many at the same time (basically one per thread) such that I tend to get the best performance at 8 worker threads. ... overall system throughput is about one video per 12 seconds.

  


  GPU processing using h264_nvenc takes the single-thread time to about 3-4 seconds. Yippie ! I went out and bought some nVidia 1660's to take advantage.

  


  Unfortunately, when I go to generate the 3rd simultaneous video, I get "Conversion Failed !" error from FFMPEG.

  


  Some basic research seems to show you can only 2 at a time. Perhaps 3 with updated drivers.

  


  Is there a method around this ? Posts from here indicates this limit is artificial and can be worked around : https://www.techpowerup.com/268495/nvidia-silently-increases-geforce-nvenc-concurrent-sessions-limit-to-3

  


  Perhaps a way to use all the cuda/tensor/etc cores to render timelapse videos instead of just relying on the limited nv_enc ?

  


• ffmpeg file read permission denied in application but not in debug

  25 novembre 2019, par Purgitoria

  My application has a function of taking captured images and using an ffmpeg background worker to stitch these into a time lapse video. The GUI has some simple options for video quality and for the source folder and output file. I had an older version of my application written in VB.NET and that worked without issue but i am rewriting in C# as it supports additional capture and filter capability in the image processing but am having real trouble figuring out what is wrong with this function.

  I have tried relocating ffmpeg to different locations just in case it was a permissions issue but that had no effect and i also tried to put the function in a "try" with a message box to output any exceptions but i got different errors that prevented me from compiling the code. When i run the application from within VS 2015 in the debugging tool the function works just fine and it will create a video from a collection of still images and create a log but when i build and install the application it does not work at all and i cannot see what is causing it to fail. In the options for ffmpeg i used the -report to output a log of what happens in the background worker and in debug it creates this log but from the application it does not so i presumed it was not even running ffmpeg and going straight to the completed stage of the function.

  Function startConversion()
  
  
  
      CheckForIllegalCrossThreadCalls = False
  
      Dim quality As Integer = trbQuality.Value
  
      Dim input As String = tbFolderOpen.Text
  
      Dim output As String = tbFolderSave.Text
  
      Dim exepath As String = Application.StartupPath + "\\bin\ffmpeg.exe"
  
      input = input & "\SCAImg_%1d.bmp"
  
      input = Chr(34) & input & Chr(34)
  
      output = Chr(34) & output & Chr(34)
  
  
  
      Dim sr As StreamReader
  
      Dim ffmpegOutput As String
  
  
  
      ' all parameters required to run the process
  
      proc.StartInfo.UseShellExecute = False
  
      proc.StartInfo.CreateNoWindow = True
  
      proc.StartInfo.RedirectStandardError = True
  
      proc.StartInfo.FileName = exepath
  
      proc.StartInfo.Arguments = "-framerate 25 -start_number 0 -pattern_type sequence -framerate 10 -i " & input & " -r 10 -c:v libx264 -preset slow -crf " & quality & " " & output
  
      proc.Start()
  
  
  
      lblInfo.Text = "Conversion in progress... Please wait..."
  
      sr = proc.StandardError 'standard error is used by ffmpeg
  
      btnMakeVideo.Enabled = False
  
      Do
  
          ffmpegOutput = sr.ReadLine
  
          tbProgress.Text = ffmpegOutput
  
      Loop Until proc.HasExited And ffmpegOutput = Nothing Or ffmpegOutput = ""
  
  
  
      tbProgress.Text = "Finished !"
  
      lblInfo.Text = "Completed!"
  
      MsgBox("Completed!", MsgBoxStyle.Exclamation)
  
      btnMakeVideo.Enabled = True
  
      Return 0
  
  
  
  End Function

  I checked the application folder and it does contain a sub folder \bin with the ffmpeg.exe located within the folder so i then used cmd to run an instance of the installed ffmpeg from the application folder and it seemed to be throwing out permissions errors :

  Failed to open report "ffmpeg-20191101-191452.log" : Permission denied Failed to set value ’1’ for option ’report’ : Permission denied Error parsing global options : Permission denied

  This seems then like it is certainly a permissions problem but where i am not sure. I did not run in to this error when using VB.NET so i am wondering where i am going wrong now. I thought perhaps it would just be a write permission in the application folder so i the removed the -report and ran ffmpeg again using cmd from my application folder and it then gave the error

  C :\Users\CEAstro\Pictures\AnytimeCap : Permission denied

  Am i missing something really obvious in my code or is there something more fundamental i have wrong in my setup ?

  I should also add that i tried running ffmpeg via cmd from a copy that was manually placed elsewhere (i used the same file) and that actually created the report but again i got a permission denied when trying to read the input files, considering it was from the user "my pictures" folder which should not have restrictions on read/write access i am at a rael loss.