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• Android FFMPEG + SDL2 Full screen issue (Video)

  15 janvier 2018, par byungkyu

  I make video player, use ffmpeg, SDL2.
  when I compile ffmpeg, I add —disable-filters, and I scale video using SDL.

  VideoPicture *vp;
  
  
  
  vp = &is->pictq[is->pictq_windex];
  
  Uint32 flags(SDL_GetWindowFlags(vp->screen));
  
  flags ^= SDL_WINDOW_FULLSCREEN_DESKTOP;
  
  SDL_SetWindowFullscreen(vp->screen, flags);
  
  int w = 640, h = 480; // TODO: UPDATE ME! ;)
  
  if ((flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != 0)
  
  {
  
      LOGI("toggleFullscreen 1189");
  
      SDL_SetHint(SDL_HINT_RENDER_LOGICAL_SIZE_MODE, "overscan");
  
      SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
  
      SDL_RenderSetLogicalSize(vp->renderer, w, h);
  
  }
  
  else
  
  {
  
      LOGI("toggleFullscreen 1195");
  
      SDL_SetWindowSize(vp->screen, w, h);
  
  }

  but this code show black bar, upper side and down side.
  how to make full screen, no black, and expand video height ?

  

• ffmpeg text overlay both ${frame_num} and :timecode values ?

  2 novembre 2022, par Whome

  Text overlay does not work if framenum 1..n and timecode hh:mm:ss:frame attributes are used together, how do overlay both running values ?

  


  Does not work, only timecode is incrementing and framenum is a as a text:
ffmpeg.exe -hide_banner -nostats ^
  -i "video_25fps.mp4" -threads 4 -preset fast ^
  -c:v libx264 -profile:v main -level 4.0 -s:v 640x360 -b:v 512k -pix_fmt yuv420p ^
  -refs 3 -bf 3 -g 50 -keyint_min 25 -b_strategy 1 -flags +cgop -sc_threshold 0 ^
  -movflags "negative_cts_offsets+faststart" ^
  -vf "drawtext=fontfile=/fonts/Roboto-Regular.ttf:fontcolor=White:fontsize=38:box=1:boxcolor=black:x=(w-text_w)/2:y=text_h-line_h+60:text='H264\ 640x360\ 512k\ frame\: %{frame_num}\ ':start_number=1:timecode=00\\:00\\:00\\:00:rate=25" ^
  -an -sn -t 30 -y output.mp4

Works if framenum only:
  -vf "drawtext=fontfile=/fonts/Roboto-Regular.ttf:fontcolor=White:fontsize=38:box=1:boxcolor=black:x=(w-text_w)/2:y=text_h-line_h+60:text='H264\ 640x360\ 512k\ frame\: %{frame_num}':start_number=1"

Works if timecode only:
  -vf "drawtext=fontfile=/fonts/Roboto-Regular.ttf:fontcolor=White:fontsize=38:box=1:boxcolor=black:x=(w-text_w)/2:y=text_h-line_h+60:text='H264\ 640x360\ 512k\ ':timecode='00\:00\:00\:00':rate=25"


  


• FFMPEG : using video filter with complex filter

  4 septembre 2019, par Sebastien

  I’m using the fluent-ffmpeg Node.js library to perform batch manipulations on video files. The video filter which crops a 16:9 input, adds padding and burns subtitles into the padding.

  In the next step, I would like to use a complex filter to overlay an image as a watermark.

  ff.input(video.mp4)
  
  ff.input(watermark.png)
  
  ff.videoFilter([
  
    'crop=in_w-2*150:in_h',
  
    'pad=980:980:x=0:y=0:color=black',
  
    'subtitles=subtitles.ass'
  
  ])
  
  ff.complexFilter([
  
    'overlay=0:0'
  
  ])
  
  ff.output(output.mp4)

  However, running this, I get the following error :

  Filtergraph 'crop=in_w-2*150:in_h,pad=980:980:x=0:y=0:color=black,subtitles=subtitles.ass' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a comple.
  
  -vf/-af/-filter and -filter_complex cannot be used together for the same stream.

  From what I understand the video filter and complex filter options can’t be used together. How does one get around this ?