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• lavfi/drawtext : ignore final LF of textfile.

  30 novembre 2020, par Nicolas George

  lavfi/drawtext : ignore final LF of textfile.
  A standard text file ends with a final LF.
  
  Without this change, it is interpreted as an empty final line,
  
  and visible with the box option.
  
  The current behavior can be achieved by actually having
  
  an empty line at the end of the file.
  Fix trac ticket #7948.
  

  • [DH] libavfilter/vf_drawtext.c

• ffmpeg, add static image to beginning and end with transitions

  14 mars 2021, par CreateChange

  ffmpeg noob here, trying to help my mother with some videos for real estate walkthroughs. I'd like to set up a simple pipeline that I can run videos through and have outputted as such :

  


  

  • 5 second (silent) title card ->

  


  • xfade transition ->

  


  • property walk through ->

  


  • xfade transition ->

  


  • 5 second (silent) title card

  


  


  Considerations :

  


  

  • The intro / outro card will be the same content.

  


  • The input walkthrough videos will be of variable length so, if possible, a dynamic solution accounting for this would be ideal. If this requires me to script something using ffprobe, I can do that - just need to gain an understanding of the syntax and order of operations.

  


  • The video clip will come in with some audio already overlaid. I would like for the title cards to be silent, and have the video/audio clip fade in/out together.

  


  


  I have gotten a sample working without the transitions :

  


  ffmpeg -loop 1 -t 5 -i title_card.jpg \
    -i walkthrough.MOV \
    -f lavfi -t 0.1 -i anullsrc \
    -filter_complex "[0][2][1:v][1:a][0][2]concat=n=3:v=1:a=1[v][a]" \
    -map "[v]" -map "[a]" \
    -vcodec libx265 \
    -crf 18 \
    -vsync 2 \
    output_without_transitions.mp4


  


  I have been unable to get it to work with transitions. See below for the latest iteration :

  


  ffmpeg -loop 1 -t 5 -r 60 -i title_card.jpg \
    -r 60 -i walkthrough.MOV \
    -f lavfi -t 0.1 -i anullsrc \
    -filter_complex \
    "[0][1:v]xfade=transition=fade:duration=0.5:offset=4.5[v01]; \
    [v01][0]xfade=transition=fade:duration=0.5:offset=12.8[v]" \
    -map "[v]" \
    -vcodec libx265 \
    -crf 18 \
    -vsync 2 \
    output_with_transitions.mp4


  


  This half-works, resulting in the initial title card, fading into the video, but the second title card never occurs. Note, I also removed any references to audio, in an effort to get the transitions alone to work.

  


  I have been beating my head against the wall on this, so help would be appreciated :)

  


• HOW TO CHOOSE AUDIO WHILE CONVERTING .MKV TO .MP4 [duplicate]

  30 janvier 2021, par sanjai cyber

  I am trying to convert a .mkv file to .mp4 file, I used the command

  


  


  ffmpeg -i in.mkv -codec copy out.mp4

  


  


  I got the output but the thing is, the file i am converting has 4 different language for example - english,french,chinese,german. I get the output in English but i want the audio in french (The first audio plays while I open the file in vlc is english)

  


  Does anyone know how to choose the language ?