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    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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  • FFMPEG : Overlaying one video on another one, and making black pixels transparent

    26 juillet 2016, par Michael A

    I’m trying to use FFMPEG to create a video with one video overlayed on top another.

    I have 2 MP4s. I need to make all BLACK pixels in the overlay video transparent so that I can see the main video underneath it.

    I found two ways to overlay one video on another :

    First, the following positions the overlay in the center, and therefore, hides that portion of the main video beneath it :

        ffmpeg -i 1.mp4 -vf "movie=2.mp4 [a]; [in][a] overlay=352:0 [b]" combined.mp4 -y

    And, this one, places the overlay video on the left, but it’s opacity is set to 50% so at least other one beneath it is visible :

    ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS[top]; [1:v]setpts=PTS-STARTPTS, format=yuva420p,colorchannelmixer=aa=0.5[bottom]; [top][bottom]overlay=shortest=0" -acodec libvo_aacenc -vcodec libx264 out.mp4 -y

    My goal is simply to make all black pixels in the overlay (2.mp4) completely transparent. How can this be done.

  • Why do I get a black box when I tile pictures with -filter_complex tile=2x1 in FFmpeg ?

    19 juin 2016, par Mateusz Piotrowski

    As I was trying to write a script (which attempts to join two pictures eventually) using FFmpeg I came across a very weird behaviour.

    I’ve found a command in an accepted answer for the very same problem I had (How to join two image into one by ffmpeg ?) :

    ffmpeg -i a.jpg -i b.jpg -filter_complex scale=120:-1,tile=2x1 output.jpg

    • Input : a.jpg, b.jpg

      a.jpg b.jpg

    • Output : output.jpg

      output.jpg

    What happened to the B cat ? Why is it missing from the output image ? I couldn’t find any information why tile=2x1 behaves like this.

  • avcodec/tiff : check the black level denominator

    26 octobre 2019, par James Almer
    avcodec/tiff : check the black level denominator

    Fixes ticket #8327.
    

    Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
    
Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavcodec/tiff.c

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