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• How to get file from cloud storage and process as local file without downloading ?

  23 octobre 2017, par Alex

  I am working on a project where I have to extract frames from a video by using ffmpeg (node.js). I first upload video to firebase storage from my client, and then I want to process it in the backend server. However, ffmpeg only accept file as if it is stored locally.

  const ff =new ffmpeg('C:/Users/alexh/Desktop/alex/name.avi');

  It will not work with url. I am wondering is any way I can get file from url as if it is stored locally or firebase can provide me a way to get the file ? I don’t want to use filebase trigger event because I want to send http request to backend server.

  Thank you so much

• FFmpeg - how to adjust video duration to sound duration if sound is longer, possible without re-encoding it with mp3 file ?

  21 décembre 2017, par DarioBB

  I have a problem. I have recorded my videos separately, and then added sound to it. Sometimes, sound is longer or less in duration compared to video duration. Usually sound is longer, sometimes around 20 seconds. To me, when running on my PC through flv or some Windows Media player, that is not problem, since after video is over, last capture of video stays displayed (like an image), and sounds is still executing, and video ends after sound is over. So everything is ok at my PC when running it like .flv or .mp4 file. But, when I upload that on Google drive or some other place on web (that is, when I run it in my browser for viewing after upload), I see my video is cutted to the lenght of the video duration (so my sound is cutted). I understand that this is because of different duration sizes of sound and video.

  Now I need a command with ffmpeg that can make my video to be extened to my sound duration. I would like not to reencode my videos with sound again (in sense that I would need to put my mp3 file in ffmpeg command) if I don’t need (since I have many videos and sound is already inserted in them), but just to reencode video with some ffmpeg command.

  I have watched this (not sure at the momen if this would even help me) :
  https://superuser.com/questions/801547/ffmpeg-add-audio-but-keep-video-length-the-same-not-shortest

  But with this approach, you have to reencode video with sound (mp3 or similar) file first.

  Can it be done, and what would be command, or commands for it ?
  (Edit : And if only way is to re-encode it with mp3 file, what would be command for it ?)

  Edit : I don’t want to cut my sound, I need to hold last frame till my sound is over. Currently last frame is holded only when viewing on my PC, when I upload that, clip is cutted immediately when video stops.

• How To Make Make A Video File From Images Using FFMPEG If Your Images Start At A Random Number [duplicate]

  13 mai 2019, par teot 59

  This question already has an answer here :

  • How to convert all png files from a particular number to gif using FFmpeg
    
    1 answer
    
  • Create video from image sequence starting at image_100
    
    1 answer
    

  So I am making a program on my raspberry pi and I am constantly saving pictures in the background and deleting them. So for instance in the images folder I have images from 123.png to 234.png

  for now I have been using this command :

  os.system("ffmpeg -f image2 -r 15 -pattern_type glob -i 'videos/*.png' -vcodec mpeg4 -y movie.avi")

  But it’s unreliable, because it mixes image numbers up

  (sorry for bad English)