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• ffmpeg - converting pngs with white background to movie give black background

  14 octobre 2015, par Population Xplosive

  I have a list of files with their names in the form [1-1000].00.png.
  All these are flattened images (graphs) with white background color.
  I am trying to make a movie out of these files using ffmpeg. However, when I use ffmpeg, everything white in the images become black in the movie. And everything black remains the same. The command I used is :

  The command I use is :

  ffmpeg -pix_fmt yuv420p -r 8 -f image2 -pattern_type glob -i
  ’*.00.png’ movie.mp4

• How to concatenate .mp4 files into one 4x4 movie using -ffmpeg- ?

  7 août 2021, par Clive Nicholas

  How should I best concatenate 16 separate .mp4 files into one 4x4 movie using -ffmpeg- ?

  


  I have workable code to create 2x2 movies (with changeable optional flag calls), with four equally-sized files, thus :

  


  ffmpeg -i foo1.mp4 -i foo2.mp4 -i foo3.mp4 -i foo4.mp4 \ 
 -filter_complex \
   "[0:v][1:v]hstack[t]; \
    [2:v][3:v]hstack[b]; \
    [t][b]vstack,format=yuv420p[v]; \
    [0:a][1:a][2:a][3:a]amerge=inputs=4[a]" \
-map "[v]" \ 
-map "[a]" \
-ac 2 -c:v libx264 \
foo.mp4


  


  and with four unequally-sized files, thus :

  


  ffmpeg -i foo1.mp4 -i foo2.mp4 -i foo3.mp4 -i foo4.mp4 \
 -filter_complex \
   "[0:v]scale=640:360[v0]; \
    [1:v]scale=640:360[v1]; \
    [2:v]scale=640:360[v2]; \
    [3:v]scale=640:360[v3]; \
    [v0][v1]hstack[t]; \
    [v2][v3]hstack[b]; \
    [t][b]vstack,format=yuv420p[v]; \
    [0:a][1:a][2:a][3:a]amerge=inputs=4[a]" \
-map "[v]" \
-map "[a]" \
-c:v libx264 -crf 23 \
-c:a aac -b:a 192k \
foo.mp4


  


  There is a solution posted here for splitting a single movie file into 16 4x4 pieces, but naturally I want to do the opposite ! I can't quite work out in my own mind how I can knit together the necessary elements from my 2x2 code routines and the 4x4 split code into a satisfactory 4x4 solution. It may well be that the 16 individual movie files each have to be re-scaled downwards.

  


  Any ideas would be gratefully received, especially coding solutions which are readily tweakable to any matrix combination (e.g., 3x3, 5x5, etc).

  


  Thanks very much, Clive

  


• Revision 407940243f : Changing initialization order of mb_to_top_edge & mb_to_bottom_edge Making cons

  21 mars 2013, par Dmitry Kovalev

  Changed Paths : Modify /vp9/decoder/vp9_decodemv.c Changing initialization order of mb_to_top_edge & mb_to_bottom_edge Making consistent initialization of mb_to_top,botton,left,right_edge variables after set_mb_row & set_mb_col calls. A little bit of code cleanup additionally. Change-Id : (...)