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• Combine multiple images into a video using ffmpeg (Little Bit Complicated)

  13 avril 2021, par Mayank Thapliyal

  I want to combine multiple images into a video.I will use ffmpeg with python as Python script will help me select images accordingly. And I have to fulfill multiple conditions :-

  


  1.) Frame-rate will be 0.2 (5 second for each image)

  


  2.) Screen-Ratio should be 18:9. But all images have different dimensions. And neither I want to crop nor I want to stretch them.So I want to pad them with a black background.

  


  3.) ability to add background music

  


  But the issue is that I am not able to adjust images.Either images get stretched to full screen or they cropped. So currently first I use PIL library to adjust images first then combine them with ffmpeg. But it takes a good amount of time and I don't like this approach

  


  Please help me solve my issue by only using ffmpeg(I guess that it will be fast enough)

  


  Thanks in advance

  


• 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

  


• 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