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• FFMPEG -t outputs more length than it should ?

  17 novembre 2019, par Taapo

  When I run this command :

  /usr/bin/ffmpeg -y -f lavfi -i 
  
  "color=color=black@0.0:size=1080x1080,format=rgba,subtitles=../content/test/test.ssa:alpha=1" 
  
  -c:a aac -c:v png -t "00:00:13.4" -threads 0 "../content/test/test.ssa.mov" -stats

  And load the resulting mov file into any video editor, I get the length

  00:00:13:10

  I have a couple of hundredths of milliseconds of black (empty) space at the end of the video. What am I missing here ?

  I’m gonna include the SSA file here, so it’s a bit more clear :

  [Script Info]
  
  ScriptType: v4.00
  
  PlayResX: 960
  
  PlayResY: 540
  
  PlayDepth: 0
  
  Timer: 100.0
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,24,&H00FFFFFF,&HFF000000,&HFF000000,&HFF000000,-1,0,0,0,100,100,0,0.00,3,0,0,5,100,100,100,1
  
  
  
  Dialogue: 0,00:00:00.00,00:00:13.400,Default,,0,0,0,,Testing

• How to extract frame video to images with removing duplicate area pixel

  8 juin 2022, par yuwiek

  Can ffmpeg to extract 1 second frames by auto transparent area that duplicate within that 1 second frames ? ex. 1 second have 24 frames. typical default cinema fps. by default ffmpeg just extract that 24 frames to image even only little movement. in simply i can just drop that frame that look same. but i dont want, i want it that area frames from 24 frames. look same, sequential be transparent, so it can reduce size of output. than later i will construct it back to 1 second frames. by just stack it frame by frame.

  


  for clearly, lets say again 1 second have 24 frames, frame 1 and frame 2. only have different in top left, like a rectangle black area. because of that, frame 2 should only output that rectangle black area. so later i just stack it to reconstruct that 1 second frames. then next one frame 3 will compare again with new stack frame 2 to know which area that different. and make it transparent again in frame 3. so on. look this image https://i.ibb.co/25hcrpB/Untitled.png

  


• FFmpeg : Trim video then add watermark with multiple text

  21 novembre 2016, par Iura Gaitur

  I want to trim a video then convert a video using FFMPEG and place a watermark with multiple texts on it. I have commands for trimming :

  ffmpeg -i 1.mp4 -ss 00:00:03 -t 00:03:08 -async 1 -c copy output1.mp4

  and for watermark with text placing

  ffmpeg -i 1.mp4 -i watermark_small.png -filter_complex "[0:v][1:v]overlay=10:10, drawtext=enable='between(t,0,12)':fontfile=font.ttf:text='Some text' : fontcolor=black: fontsize=18: box=1: boxcolor=yellow@0.5:boxborderw=5: x=(w-text_w)/1.15:y=30, drawtext=enable='between(t,14,22)':fontfile=font.ttf:text='Next text' : fontcolor=black: fontsize=18: box=1: boxcolor=yellow@0.5:boxborderw=5: x=(w-text_w)/1.15:y=30" -codec:v libx264 -preset ultrafast output1.mp4

  Can someone help me to combine them together ?