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• How to rip a movie-DVD using cmd-line FFMPEG

  19 octobre 2022, par David

  I'm trying to use the cmd-line FFMPEG pgm, to rip a movie-DVD into either a MP4 or MKV container, on Windows-OS. (Please do NOT tell
me to use some other GUI-based pgm, as so many of the other articles
do.)

  


  The part of the ffmpeg command that I can't determine, is just
what syntax to use to reference the DVD-drive as the input. (I've
looked in the FFMPEG documentation, but I can't see the forest
for the trees.)

  


  [Edit :]So I did some more google-searches and found an article on using VLC for this task.
Since I already had VLC installed, this approach
seemed worth trying. That article is here : https://www.howtogeek.com/howto/2696/how-to-rip-dvds-with-vlc/
(Stay tuned for further updates on my progress.)

  


• Cannot use input file in filter_complex_script (movie filter)

  28 juin 2022, par Nick Gammon

  I am trying to edit some video footage using ffmpeg rather than a GUI editor.

  


  This example works, to read a PNG file and overlay a resized video on top of it :

  


  ffmpeg -y \
 -loop 1 -i 'Title.png' \
 -i 'Presentation.mp4' \
 -filter_complex_script 'my.nodes'  \
 -map "[video]" -map 1:a -codec:a copy output.mkv


  


  The file my.nodes contains :

  


  [1:v]scale=430:240[a];
[1:v]scale=1280:720[b];
[0:v][a]overlay=0:0[c];
[c][b]overlay=overlay_w*2:overlay_h:shortest=1[video]


  


  ---

  


  However rather than referring to the input files as numbers (1:v etc.) I wanted to use the "movie" filter to input the files as a source filter, like this :

  


  ffmpeg -y \
 -filter_complex_script 'my_improved.nodes'  \
 -map "[video]" output.mkv


  


  The file my_improved.nodes contains :

  


  movie=Title.png[title];
movie=Presentation.mp4[talk];
[talk]scale=430:240[a];
[talk]scale=1280:720[b];
[title][a]overlay=0:0[c];
[c][b]overlay=overlay_w*2:overlay_h:shortest=1[video]


  


  This gives the error :

  


  Invalid file index 0 in filtergraph description movie=Title.png[title];
movie=Presentation.mp4[talk];
[talk]scale=430:240[a];
[talk]scale=1280:720[b];
[title][a]overlay=0:0[c];
[c][b]overlay=overlay_w*2:overlay_h:shortest=1[video]
.


  


  ---

  


  How can I embed video/image names into the filter itself ?

  


• 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