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Autres articles (64)

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Sur d’autres sites (10195)

  • Revision c53a95ad1d : Avoid calling vp9_is_scaled two times in a function. Use a local variable to ho

    25 septembre 2014, par hkuang

    Changed Paths :
     Modify /vp9/common/vp9_reconinter.c



    Avoid calling vp9_is_scaled two times in a function.

    Use a local variable to hold the result of vp9_is_scaled.

    Change-Id : I5e203909805923e20eefef596bc84424da47dbe2

  • vorbis : Use a local codebook variable

    3 mars 2015, par Luca Barbato
    vorbis : Use a local codebook variable

    Makes the code a little simpler.
    • [DH] libavcodec/vorbisdec.c

  • How to overlay frames before making a gif FFMPEG WEBM TO GIF

    10 février 2021, par AVID_FFMPEG

    I'm using windows batch to do some ffmpeg work

    


    Basically what I need to do is this

    


    Add an overlay every X frames (10 in this example, 1, 11 , 21 and so on) to a webm source to a gif.

    


    The how doesn't really matter as long as I keep the quality of my current palette/filter/dither usage

    


    Solution I found : I made a Video to png, overlay the png with batch for loop and make a gif

    


    Problem I encountered : Gif doesn't work with the overlayed pngs

    


    rem EXTRACTING
ffmpeg !time_range! -i "input.webm" -vsync 0 -vf "fps=20,scale=!size!" "output_%%03d.png" 


    


    the two %% is because you need to escape it in batch so ffmpeg sees "%03d"

    


    REM OVERLAYING
for %%i in (_*1.png) do (
ffmpeg -y -v error -i %%i -i %tmp_blank_frame% -filter_complex "overlay"  overlayed_%%~nxi
del %%i
)
REM REPLACING
rename "overlayed_*" "//////////*"


    


    It is not pretty by any means, but it works... somewhat.

    


    It does it's job of overlaying and renaming proprely, but when I recompile the frames into a gif with

    


    ffmpeg -y -framerate 20 -i "output_%%03d.png" -i "!palette!" -filter_complex "!filters! [v]; [v][1:v] paletteuse=dither=!dither!" "overlayedgif.gif"


    


    it just gives me an error "Error marking filters as finished" and does nothing.

    


    ffmpeg -y -framerate 20 -i "output_%%03d.png" -i "!palette!" "overlayedgif.gif"


    


    It makes the gif without the black frames (skips them) also terrible quality

    


    I am open to any suggestion. Pretty new to this whole ffmpeg and this is starting to be very complicated for me so there might be some code that I overlook or don't fully understand

    


    Important note IF I REMOVE THE OVERLAY/RENAME BLOCK MY SCRIPT WORKS WONDERS !!!

    


    EDIT : edited confusing variables im using in my script

    


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