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• Overlay of multiple sources with layer order like CSS z-index

  6 mars 2021, par Basj

  Note : I've already read a few questions/answers about [ffmpeg] overlay, but it did not fully answer this.

  


  Let's say we have five inputs [0] ... [4] that can be images, videos, etc.

  


  I'd like to overlay them in a precise order, a bit like "Photoshop layers" or CSS z-index.

  


  Currently I use ffmpeg with a "recursive" use of overlay like this :

  


     -filter_complex "
        [0]setpts=PTS-STARTPTS[s0];
        [1]setpts=PTS-STARTPTS+3/TB[s1];
        [2]setpts=PTS-STARTPTS+7/TB[s2];
        [3]setpts=PTS-STARTPTS+8/TB[s3];
        [4]setpts=PTS-STARTPTS+9/TB[s4];
        [s0][s1]overlay=enable='between(t,3,13)'[o1];
        [o1][s2]overlay=enable='between(t,7,12)'[o2];
        [o2][s3]overlay=enable='between(t,8,15)'[o3];
        [o3][s4]overlay=enable='between(t,9,12)'[o4];
   "


  


  Question : with ffmpeg, is there a way to do a mixing of different inputs / "layers" :

  


  

  • in a shorter way that this recursive use of overlay

  


  • and such that we can specify the "stack order" of each layer, like with CSS z-index

  


  


   ?

  


  To give a concrete example, how would you modify this command such that :

  


  

  • from 0'00" to 0'10", the layer order (from background to foreground) is 0, 1, 2, 3, 4

  


  • from 0'10" to 0'15", the layer order (from background to foreground) is 2, 3, 1, 4, 0 (i.e. [0] goes to foreground)

  


  


   ?

  


• Add multiple overlays to video in ffmpeg

  25 mars 2021, par Bas950

  On my video I am adding multiple overlays, 1 that will always be shown (Overlay/overlay.png) and I got a progress bar in PNGs named 0 to the last frame num.

  


  Is there a small way I can do this in because I tried adding every thing and the command was too long.

  


  ffmpeg -i 6875126077795372290.mp4 -i Overlay/overlay.png -filter_complex "[0:v][1:v] overlay=0:0"
  
I added -i Overlay/ProgressBar/0.png -filter_complex "[0:v][2:v] overlay=0:20" for every frame and yea it got too long...

  


  I tried doing something like this : ffmpeg -i 6875126077795372290.mp4 -i Overlay/overlay.png -filter_complex "[0:v][1:v] overlay=0:0" -i Overlay/ProgressBar/%d.png -filter_complex "[0:v][%d:v] overlay=0:20" output.mp4
  
But I just cannot get it working.

  


  [Edit] :
I tried the ffmpeg -i 6875126077795372290.mp4 -i Overlay/overlay.png -i Overlay/ProgressBar/%d.png -filter_complex "[0:v][1:v]overlay=0:0[bg];[bg][2]overlay=0:20" output.mp4 from @llogan and it does it all, but strangely the video is not 6 seconds longer ? Cause I got the images for 432 frames, and the video is now 17seconds long instead of 11, the video for some reason got a strange frame rate of 37 (see attachment).
  How should I solve this ? (I got this file information using ffprobe)
  
Attachment : https://i.imgur.com/1WNqvnS.png
  
Full file information : https://pastebin.com/rxkK39h7
  
Full ffmpeg log : https://pastebin.com/CBiusbRE

  


• applying multiple filter ffmpeg

  28 mars 2021, par Eswar T

  I'm trying to rotate videos and increase its sound as well as change itsframe rate

  


  ffplay -i C:/Users/thota/OneDrive/Desktop/VET/Input.mp4 -af "volume="10.0",atempo="10.0" -vf "transpose=2,transpose=2,setpts=1/"10.0"*PTS,scale="3840:2160",fps="5.0"


  


  I'm using FFmpeg as I'm trying to build a video editing application hence I need to combine many operations when i try to use above command I'm getting this error(in command im using ffplay as I just want to see output)

  


  error

  


  [atempo @ 000001fdd50c7c40] [Eval @ 00000047b79fe770] Undefined constant or missing '(' in 
'vftranspose=2'
[atempo @ 000001fdd50c7c40] Unable to parse option value "10.0 -vf transpose=2"
[atempo @ 000001fdd50c7c40] [Eval @ 00000047b79fe770] Undefined constant or missing '(' in 
 'vftranspose=2'
[atempo @ 000001fdd50c7c40] Unable to parse option value "10.0 -vf transpose=2"
[atempo @ 000001fdd50c7c40] Error setting option tempo to value 10.0 -vf transpose=2.
[Parsed_atempo_1 @ 000001fdd50c7b40] Error applying options to the filter.
Error initializing filter 'atempo' with args '10.0 -vf transpose=2'


  


  Pleas help me solve this issue and suggest me a best way to add multiple operations when i try to use , its being tough so is their any other way
If yes please let me know
Thank you