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• Making a watched folder wait for a file to finish rendering

  19 septembre 2015, par JSchrey

  I’m trying to setup a watched folder (using fswatch)that starts to convert a received file into another format using ffmpeg(got that part sorted out).
  So far so good, what I’m having problems with is getting the script to wait until the original input (or master file) has finished rendering or has been copied completely into my watched folder.

  Here’s the script for the folder

  fswatch -o ~/Desktop/autom_shell| xargs -n1 ~/Desktop/scripts_autom_shell/move_QT.sh

  move_QT.sh filters and moves quicktime movies from my receiving folder to the folder where I encode.

  I’ve searched for a solution and found kqwait but I have absolutely no idea how to apply it in my case.

  MacOS 10.10

• How do I crossfade between scenes in ffmpeg using a complex filter ?

  15 mars 2014, par scubed

  I have ffmpeg 2.1.4 and an input movie in.mkv.
  There are effectively 2 different scenes inside of in.mkv. I want to be able to crossfade between the scenes, preferably with just using a complex filter instead of external programs. Essentially, I want to have something like an overlay but with the alpha changing at a specific time.

  Consider if in.mkv looked like this :

  00:00 - 00:05 scene 1
  
  00:05 - 00:10 junk
  
  00:10 - 00:15 scene 2

  So, I would want an output that had :

  00:00 - 00:04 scene 1 (0-4)
  
  00:04 - 00:05 alpha fading between scene 1 (4-5) and 2 (10-11)
  
  00:05 - 00:09 scene 2 (11-15)

  I see that there's a filter for : overlay, alphamerge, and color, but it's not clear how exactly to do this.

  In general, it seems hard to work with pieces of a movie file in ffmpeg. Is there a way to say that I am taking various pieces of the same input file and putting them together without rendering them as separate movies first ?

• Blank out video frames for last two minutes of MP4 (while keeping audio intact)

  13 juillet 2020, par fourells5

  I am trying to make a copy of one of my mp4 movies with audio intact, but blacking out video frames only on the last few minutes. Basically I want to keep the end credit music but without the artifacted video.

  


  I found this answer : which works perfectly for an entire mp4 file (including a test fragment I made of the above ending credits sequence), but I need it applied as I stated above to just the end of the entire copied full mp4.

  


  In this case I don't want to start blanking the video stream frames until after 2h 7m 30s. I messed around with combinations of the -ss, -start_time and -timecode 02:07:31 params, but I'm an ffmpeg noob and couldn't get it to produce anything but cut-out sections or the whole copy blanked.

  


  Any guidance would be greatly appreciated !