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• Android sws_scale RGB Frame taking long time and cause of latency in the video

  17 avril 2018, par AJit

  I am reading frames from FFMPEG and try to directly draw to surface window in Native android, If i scale image to exact size what we are getting from camera and apply YUV420P to RGBA it take 1ms to scale through av_image_fill_arrays but if i try to scale image what i need for surface, then i take 25 to 30ms to scale same frame. so latency is the problem.

  In below example getting YUV420P pixel format.

  Low latency :[ 1ms by sws_scale]

  swsContext = sws_getContext(videoCodecContext->width,
  
                                      videoCodecContext->height,
  
                                      videoCodecContext->pix_fmt,
  
                                      videoCodecContext->width,
  
                                      videoCodecContext->height,
  
                                      AV_PIX_FMT_RGB0,
  
                                      SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  av_image_fill_arrays()
  
  av_read_frame()
  
  avcodec_decode_video2(
  
  sws_scale(swsContext,
  
            (const uint8_t *const *) videoFrame->data,
  
            videoFrame->linesize,
  
            0,
  
            videoCodecContext->height,
  
            pictureFrame->data,
  
            pictureFrame->linesize);
  
  ANativeWindow_lock()
  
  Write all buffer bytes to window.
  
  ANativeWindow_unlockAndPost()

  Low latency :[ 30ms by sws_scale]

  [videoContext Width: 848 Height: 608]
  
  swsContext = sws_getContext(videoCodecContext->width,
  
                                      videoCodecContext->height,
  
                                      videoCodecContext->pix_fmt,
  
                                      1080,
  
                                      608,
  
                                      AV_PIX_FMT_RGB0,
  
                                      SWS_FAST_BILINEAR, NULL, NULL, NULL);

  Whenever we change context width and height other then videoContext it will take more then 30ms and we are delaying the video.

  TRY 1 : Pass the buffer from JNI to Java and create bitmap there to scale later on but createBitmap itself take 500ms so no useful.

  TRY 2 : Direct YUV420P to RGB conversion. still long time then sws_scale.

  TRY 3 : Direct write YUV to window bites but it show without color(If anyone have solution here will might helpful).

  TRY 4 : Use yuvlib, no luck.

  TRY 5 : Different color combinations and flags in swsContext.

  Any help would appreciated.

• FFmpeg :Run one bat after one bat

  16 avril 2018, par AniEncoder

  well I tried to run a .bat file after a file gets downloaded by qBittorrent, the .bat will change font and rename it and move it another folder.

  There are 3 problems
  1. two .bat needed to run...font & rename
  2. the file gets copied in to folders

  I need to add some gap between EngSub, if i do that, it donot shows in the file output

  Change Font
  
  for %%A in (*.mkv) do ffmpeg -i "%%A" -map 0:s:0 "%%A.ass"
  
  
  
      ren *.ass *.txt
  
  
  
      setlocal
  
  
  
      @echo off
  
      call :FindReplace "Open Sans Semibold" "CronosPro-Bold" "*.txt" 
  
      call :FindReplace "&H00020713" "&H0000003B" "*.txt" 
  
      call :FindReplace ",1.7," ",2," "*.txt" 
  
      @echo on
  
  
  
      ren *.txt *.ass
  
  
  
      for %%A in (*.mkv) do ffmpeg -i "%%A" -i "%%A".ass -c copy -map 0:0 -map 0:1 -map 1:0 -metadata:s:s:0 language=eng -disposition:s:0 default -attach CronosPro-Bold.ttf -metadata:s:3 mimetype=application/x-truetype-font "..\720p\%%A"
  
  
  
      del *.ass
  
  
  
      :FindReplace <findstr> <replstr> <file>
  
      set tmp="%temp%\tmp.txt"
  
      If not exist %temp%\_.vbs call :MakeReplace
  
      for /f "tokens=*" %%a in ('dir "%3" /s /b /a-d /on') do (
  
        for /f "usebackq" %%b in (`Findstr /mic:"%~1" "%%a"`) do (
  
          echo(&amp;Echo Replacing "%~1" with "%~2" in file %%~nxa
  
          &lt;%%a cscript //nologo %temp%\_.vbs "%~1" "%~2">%tmp%
  
          if exist %tmp% move /Y %tmp% "%%~dpnxa">nul
  
        )
  
      )
  
  
  
      del %temp%\_.vbs
  
  
  
      :MakeReplace
  
      >%temp%\_.vbs echo with Wscript
  
      >>%temp%\_.vbs echo set args=.arguments
  
      >>%temp%\_.vbs echo .StdOut.Write _
  
      >>%temp%\_.vbs echo Replace(.StdIn.ReadAll,args(0),args(1),1,-1,1)
  
      >>%temp%\_.vbs echo end with
  
  </file></replstr></findstr>

  Rename

  ren  "[HorribleSubs]*.mkv" "[hasu]*.mkv"
  
  ren  *[*  *[1090p][Eng Sub].*
  
  call "1080.bat"
  
  move [hasu]*.* ..\Trash

• Moviepy Making a CompositeVideoClip of two concatenate_videoclips

  16 avril 2018, par Max Better

  Working with the Moviepy lib and I’ve been beating my head off a wall with this last step for a while.

  GifClips = concatenate_videoclips(TheGIFs, method='compose')
  
  TextClips = concatenate_videoclips(TheTexts, method='compose')

  I’ve written both of these to separate files and they look fine. But I’m having a problem getting them to combine properly.

  I’m trying :

  FinishedClips = CompositeVideoClip([GifClips, TextClips], size=(1920,1080))

  It has the audio from TextClips and shows the GifClips but the text isn’t visible. It did show when written alone without the composite.

  It does work if I combine GifClips with a single TextClip but this doesn’t work when I need text clips to run one after another.

  I could run a CompositeVideoClip with every single TextClip and a part of the GifClips and then concatenate them all together but that doesn’t seem like the neatest way of doing this. My guess is there’s a fairly obvious argument here somewhere but looking through the docs and examples I’m struggling so far.

  Any suggestions on how I could get the TextClips clip to show up properly in a composite would be much appreciated.