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• ffmpeg how to copy one frame for certain duration

  19 août 2018, par user889030

  Am trying to add image Overlay to video it specific duration for specific time period for which i want that video frame to be copied for specific time so that video feels like stationary and image overlay have animated effect on that specific frame .

  ffmpeg -y -i small.mp4 -i google.png -filter_complex "overlay=enable='between=(t,1,4)':x=30+t*28:y=50"  output.mp4 

  the above command insert google.png to video small.mp4 between 1 to 4 sec it x=30 and y =50 where x is added with t * 28 , which create 28 pixel shift it x-axis

  currently am using this command which works ok but the problem is i do no know how to copy the frame for certain duration so that image overlay have animation effect on it

• FFmpeg command for crossfading between 2 videos and merge last video without fading not working

  13 juin 2016, par Harsh Bhavsar

  Here, New in FFmpeg . I am using this library

  I already done with 2 video join with this command :

  String[] complexCommand = {"ffmpeg","-y","-i","/sdcard/cut_output.mp4",
  
                      "-i","/sdcard/harsh1.mp4","-strict","experimental",
  
                      "-filter_complex",
  
                      "[0:v]scale=640x480,setsar=1:1[v0];[1:v]scale=640x480,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1",
  
                      "-ab","48000","-ac","2","-ar","22050","-s","640x480","-r","30","-vcodec","mpeg4","-b","2097k","/sdcard/merged.mp4"};

  Now i need a command that first 2 videos join between cross fade effect and third video without fading effect directly join .I need that command Help me out pls... Thanx

• Revision 8d7f53f04c : Account for rate error in GF group Q calculation. When GF group adaptive maxQ i

  20 février 2015, par paulwilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_firstpass.c

  
   Modify /vp9/vp9_cx_iface.c

  
  
  Account for rate error in GF group Q calculation.

  When GF group adaptive maxQ is enabled this patch accounts
  somewhat for accumulated error in the rate control.

  This improves accuracy quite a bit on many clips especially
  when there is overshoot.

  Examples when the overshoot and undershoot command line
  parameters are set to 100 :

  Hall @ 1200 overshoot is reduced from 67-24%.
  Akiyo @ 400 undershoot is reduced from 28%-15%.

  Setting a lower value for undershoot or overshoot still
  reduces the error further.

  Impact on metrics is mixed with some gains in average psnr
  but generally a little lower (e.g. 0.5%) on overall and ssim.

  The GF group adaptation is still off by default in this patch.
  Compared to with the head, enabling this mode now gives
  big average psnr gains on the YT sets (e.g. YT_HD >11.2%),
  a drop in overall PSNR (YT-HD 3.9%) and a smaller drop or
  neutral for SSIM.

  Change-Id : If4b32cd0740d3fb941317b374f9c2951954eee90