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• avfilter/delogo : Set default band to 1

  7 octobre 2015, par Jean Delvare

  avfilter/delogo : Set default band to 1
  The original interpolation algorithm behaved poorly on the borders and
  
  did not even guarantee continuity at the borders. For this reason, a
  
  second interpolation/blending pass was required on the borders to make
  
  them seamless.
  However, since the interpolation algorithm was improved in June 2013,
  
  the border issues no longer exist. The new algorithm does guarantee
  
  continuity at the borders, making the second pass useless. A larger
  
  band always increases the cumulated interpolation error. In most cases
  
  it also increases the average interpolation error, even though the
  
  samples in the band are only partially interpolated.
  For this reason I would like to get rid of the "band" parameter. As a
  
  first step, let’s change its default value from 4 to 1 and document it
  
  as deprecated.
  I have benchmarked this change on a combination of input sources and
  
  realistic logo areas. Lowering the band value from 4 to 1 resulted in
  
  8 to 39 % less interpolation error per frame (or 1 to 34 % less
  
  interpolation error per luma sample.)
  Signed-off-by : Jean Delvare <jdelvare@suse.de>
  
  Signed-off-by : Stefano Sabatini <stefasab@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_delogo.c

• ffmpeg overlay video with semi transparent video

  25 octobre 2015, par endryha

  I am trying to overlay background video with another semi transparent video using ffmpeg.

  Thanks to Overlaying multiple videos with ffmpeg I managed to put video overlay over background video.

  The problem is that I don’t know how to make overlay video semitransparent.

  So far I am using following commands :

  ffmpeg -i VID_105470127_044810.mp4 -vf "movie=VID_21550603_142437.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  ffmpeg -i VID_105470127_044810.mp4  -i VID_21550603_142437.mp4 -filter_complex "overlay, overlay=10:10" combined.mp4

  I tried to play with fade effect but this is not what I want. Please point me out where to look and what can I try to achieve this.

  UPDATE #1

  It looks like blend filter is exactly what I need but another issue came out :

  ffmpeg -i video1280x720.mp4 -vf "movie=video640x640.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  [Parsed_blend_3 @ 0x7f8041500da0] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (640x640, SAR 1:1)
  
  [Parsed_blend_3 @ 0x7f8041500da0] Failed to configure output pad on Parsed_blend_3

  So probably if I can resolve issue with different resolutions I am done with my task.
  Please advice what is the direction to go.

  UPDATE#2

  To solve different resolution problem I decided to crop video and then proceed with blending filter

  ffmpeg -i VID_1920x1080.mp4 -filter:v "crop=640:640:0:0" -c:a copy VID_1920x1080_cropped.mp4
  
  
  
  ffmpeg -i VID_1920x1080_cropped.mp4 -i VID_21550603_142437.mp4 \
  
  -filter_complex "[1:0] setdar=dar=1,format=rgba [a]; [0:0]setdar=dar=1,format=rgba [b]; [b][a]blend=all_mode='overlay':all_opacity=0.8" blended.mp4

• Application file with Python and FFMPEG

  29 octobre 2018, par user243

  Not sure if this is the right place for this question - but I have a python script which uses ffmpeg. I want to create an application/executable file which includes the dependencies of Python and ffmpeg which I can distribute so that others don’t have to install Python or ffmpeg on their machine to run the script.

  Any ideas how this can be achieved ?