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• ffmpeg set output resolution by resizing image

  3 janvier 2020, par Martin

  I’m trying to use ffmpeg for rendering video where an audio file and image are taken as inputs, and turned into a video (basically a music video) with the audio file playing for the duration of the video.

  My current working command :

  ffmpeg -loop 1 -framerate 2 -i "front.png" -i "testWAVfile.wav" -vf "scale=2*trunc(iw/2):2*trunc(ih/2),setsar=1,format=yuv420p" -c:v libx264 -preset medium -tune stillimage -crf 18 -c:a aac -shortest -vf scale=1920:1080  "outputVideo.mp4"

  Will set the output resolution of the video to whatever the resolution of the image is. Is there a way I can resize the image to enlarge it by a couple multiplications so that the output video resolution will be higher ?

  Like if my front.png image was 800x800 pixels, I could add something to my ffmpeg command to triple the resolution, so that the output video resolution is 2400x2400 ?

• What resolution would be best for processing videos in firebase functions ? [closed]

  11 janvier 2020, par Nathan

  I’m making an app that is mainly used for sharing videos of maximum 30 seconds long. One video example could be a screen recording of someone’s computer screen or a game. I have this code that checks whether the uploaded video that has just been uploaded to firebase storage has been processed or not and if it hasn’t then I use ffmpeg to process the video (change the resolution etc.) with this command :

  const promise = spawn('./ffmpeg', ['-i', tempFilePath, '-vf', 'scale=1280:720', targetTempFilePath]);

  Now with these commands, the firebase function is giving me a timeout error when I upload 30 second clips since I’m only converting the video to 720. I was just wondering what compression settings would be sufficient enough for the video to :

  1. Be still a high enough quality in my app
  2. Not take ages processing the video in the function (10-20 second clips works perfectly well).

  I know the better option would be to use Googles App engine or something similar to process videos but I’d prefer it to avoid that at the moment, if I can’t process videos to a good enough quality without sacrificing efficiency then I will go to something like Google’s App engine, just need some advice and some pointers for it otherwise.

  EDIT :

  I’ve seen instagram compresses their videos to a resolution of 640x640 ? Would that be reasonable or is it dependent on the original clip’s resolution ?

  Thanks

• Bulk Edit Videos resolution/aspect problem

  1er mars 2020, par buffe buffera

  Lets say i have 100 videos, all different dimensions and formats
  I would like to know if there’s a way to bulk edit each video and set it to 16:9 1920x1080
  If is possible would like to add blurred sides effect

  for %%a in ("C :\Users\vmp\Desktop\Videos\100ClipsConcat*.mp4") do ffmpeg -i "%%a" -lavfi "scale=1080:640,boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=1[bg] ;[bg][0:v]overlay=(W-w)/2 :(H-h)/2,setsar=1" "C :\Users\vmp\Desktop\Videos\100ClipsConcat\Blurred\%% na.mp4"
  pause

  Ive tried this and it blur add video but resolution isnt good

  Ive also tried to do that :

  ffmpeg -i 2.mp4 -lavfi "scale=ih*16/9 :-1,boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=1[bg] ;[bg][0:v]overlay=(W-w)/2 :(H-h)/2,crop=h=iw*9/16,setsar=1" r3.mp4

  It blur every video perfectly but it also increase resolution a lot

  I would just like to find something that convert each video to 1920x1080 16:9 (if is possible with blur effect)