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• avfilter/vf_bwdif : Use common yadif frame management logic

  4 novembre 2018, par Philip Langdale

  avfilter/vf_bwdif : Use common yadif frame management logic
  After adding field type management to the common yadif logic, we can
  
  remove the duplicate copy of that logic from bwdif.
  

  • [DH] libavfilter/bwdif.h
  • [DH] libavfilter/vf_bwdif.c
  • [DH] libavfilter/x86/vf_bwdif_init.c

• Question about coding design of interface and receivers

  14 décembre 2018, par the_real_one

  I am trying to create an interface for an FFmpeg conversion scheme where :

  • New() should return whatever implements it
  • (receiver *interface) Convert() is the only method that should be implemented and the underlying details hidden (source files from : URL, File, etc.)

  How would I accomplish the above problem and design the code in such a way that you have various New() methods returning an FFmpegConverer that enforces the implementation of the Convert() method but with the underlying details behind each New() being different ? Or is that just a bad design to begin with ?

  My code may be less relevant than my problem statement but this is what I have so far which does not pass any go sanity checks :

  // FfmpegConverter is the interface for setting the public facing local
  
  // video files
  
  type FfmpegConverter interface {
  
    Convert() error
  
  }
  
  
  
  // localVideo holds the file information for a downloaded video
  
  type localVideo struct {
  
    inputAudioFile * os.File
  
    inputVideoFile * os.File
  
    outputVideoFile * os.File
  
  }
  
  
  
  // New initializes a new FfmpegConverter
  
  func New(inputVideoFilePath string, inputAudioFilePath string, outputVideoFilePath string)(ffmpegConverter FfmpegConverter, err error) {
  
    ffmpegConverter = & localVideo {}
  
  
  
    // Set input video file
  
    ffmpegConverter.inputVideoFile, err = os.Open(inputVideoFilePath)
  
    if err != nil {
  
      return
  
    }
  
    if err = ffmpegConverter.inputVideoFile.Close();
  
    err != nil {
  
      return
  
    }
  
  
  
    // Set input audio file
  
    ffmpegConverter.inputAudioFile, err = os.Open(inputAudioFilePath)
  
    if err != nil {
  
      return
  
    }
  
    if err = ffmpegConverter.inputAudioFile.Close();
  
    err != nil {
  
      return
  
    }
  
  
  
    // Set output video file
  
    ffmpegConverter.outputVideoFile, err = os.Create(outputVideoFilePath)
  
    if err != nil {
  
      return
  
    }
  
    if err = ffmpegConverter.outputVideoFile.Close();
  
    err != nil {
  
      return
  
    }
  
  
  
    return
  
  }
  
  
  
  // Convert will convert the input video and input audio files to an combined
  
  // output video file
  
  func(l * localVideo) Convert()(err error) {
  
    // Do stuff with the internal struct
  
    // ...
  
  }

• ffmpeg strange errors variables/undefined constants & question fonts

  21 mars 2019, par Rick

  I was trying to achieve get an animated text overlay. I found this thread :
  ffmpeg moving text drawtext

  When I run this code however :

  ffmpeg -i VideoInput.mp4 \
  
         -vf "drawtext=enable='between(t,12,15)':fontfile=myfont.otf:text='Test test': \
  
             x='if(lt(t-t2+1\,0)\,x1+(x2-x1)*(t-t1)/(t2-t1-1)\,x)': \
  
             y='if(lt(t-t2+1\,0)\,y1+(y2-y1)*(t-t1)/(t2-t1-1)\,y)':fontsize=65" \
  
         -acodec copy outputVideo.mp4

  I get the error :

  [Parsed_drawtext_0 @ 000002d862595c00][Eval @ 000000e1d79fe300] Undefined constant or missing '(' in 't2-t1-1),x)' 
  
  [Parsed_drawtext_0 @ 000002d862595c00] Failed to configure input pad on Parsed_drawtext_0

  A second strange error, which may be the cause for the problem at the top. Is that I can’t run the arguments on multiple lines. So with the code below I have to remove the slashes and put it on 1 line. I use PHP so this does not work (white screen, no output)

  $arguments = "-i out1.mp4 \
  
         -vf \"drawtext=enable='between(t,12,15)':fontfile=myfont.otf:text='Test test': \
  
             x='if(lt(t-t2+1\,0)\,x1+(x2-x1)*(t-t1)/(t2-t1-1)\,x)': \
  
             y='if(lt(t-t2+1\,0)\,y1+(y2-y1)*(t-t1)/(t2-t1-1)\,y)':fontsize=65\" \
  
         -acodec copy outputVideo.mp4 2>&1";
  
  $output = shell_exec('D:/wamp64/www/createslideshow/ffmpeg-20190319-f8075b2-win64-static/bin/ffmpeg.exe '.$arguments);

  This works but gives the undefined constant error :

  $arguments = "-i out1.mp4 -vf \"drawtext=enable='between(t,12,15)':fontfile=myfont.otf:text='Test test': x='if(lt(t-t2+1\,0)\,x1+(x2-x1)*(t-t1)/(t2-t1-1)\,x)': y='if(lt(t-t2+1\,0)\,y1+(y2-y1)*(t-t1)/(t2-t1-1)\,y)':fontsize=65\" -acodec copy outputVideo.mp4 2>&1";
  
  $output = shell_exec('D:/wamp64/www/createslideshow/ffmpeg-20190319-f8075b2-win64-static/bin/ffmpeg.exe '.$arguments);

  Last thing is that I keep getting the font error :
  Fontconfig error : Cannot load default config file
  [Parsed_drawtext_0 @ 000001d6ad86f180] Using "C :/WINDOWS/fonts/mingliub.ttc"

  I have tried :

  arial.ttf
  
  /windows/fonts/arial.ttf
  
  \windows\fonts\arial.ttf
  
  \\\windows\\\fonts\\\arial.ttf
  
  c\\:\\\windows\\\fonts\\\arial.ttf