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• 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 ?

  


• FFMPEG MP4 from a m3u8 stream results in a few black frames

  14 avril 2020, par roosevelt

  I'm noticing an odd behavior and not sure how to tackle it through FFMPEG. Basically, I'm downloading some ts files from a stream and making an MP4 out of them. I don't need to encode them since they are already encoded.

  



  Here's the command :

  



  ffmpeg -nostdin -y -ss 3 -i https://d2nvs31859zcd8.cloudfront.net/d33af82762361135e8ba_yassuo_37349116016_1403122741/chunked/index-muted-EIVFBWYS1V.m3u8 -t 50 -c copy Test.mp4


  



  If I run the MP4 file in Quicktime player, it seems like there are one or two black frames in the beginning. How do I get rid of that using the above command ?

  



  I also tried downloading the .ts files and concat them via FFMPEG. But the result is the same. First few frames are black.

  



  ffmpeg -nostdin -y -i "concat:0.ts|1.ts|2.ts|3.ts|4.ts|5.ts|6.ts" -c copy Test2.mp4


  



  Seems like VLC doesn't show the black frame but it's apparent on the Quicktime player.

  



  Thanks

  


• ffmpeg - how to add text on black background at end of video for 10 sec ?

  3 octobre 2015, par jamie

  I have some mp4 files I’d like to add some white text reading something like

  "StackOver Flow Rules see more at www.stack.com/324324 bla bla and some more words here !"

  To the end of the videos on a black background that last 10 seconds.

  How would I achieve this with FFMPEG ?