Recherche avancée

Sur d’autres sites (10922)

• How convert High bitrate mp3 to lower rate using ffmpeg in android

  23 mars 2018, par Android Team

  We want to convert 320kbps mp3 file to 128kbps mp3 so currently we are using below ffmpeg command but its not working.

  ffmpeg -i input.mp3 -codec:a libmp3lame -qscale:a 5 output.mp3

  Result :-the output bitrate same as input mp3.

  And we are following the FFmpeg Encoding guideline for that here is the link :- https://trac.ffmpeg.org/wiki/Encode/MP3

  so please suggest any solution.

• Adding a rotating effect on an image using ffmpeg ? [closed]

  5 mai 2024, par Garry

  I'm trying to overlay an image on a video, and add subtle rotating effects for that image, left, right, left right, and so on. (see pictures) The rotation works, however the edges are always very jagged and bad quality.
Is there a way to improve my filters, or is there a better approach that I can use, without jagged edges ?

  


  This works, overlays the image.png and applies to rotating effect :

  


  ffmpeg -loop 1 -i image.png -i video.mp4 -t 10 -filter_complex "[0:v]scale=720:720:flags=lanczos,fps=25,format=rgba,rotate=0.05*sin(2*PI*t/4):c=black@0:ow=round(iw*1.5):oh=round(ih*1.5)[rotated];[1:v][rotated]overlay=(W-w)/2:(H-h)/2:shortest=1" -c:v libx264 -crf 16 -preset veryslow -c:a copy -y output.mp4

  


  But the edges turn out to be very jagged :

  


  

  


  

  


  

  


• Why Can't i view a few of my mp4 files in my .erb but can in html file ?

  27 avril 2016, par Joseph McKenzie

  I have a site that I’m working on for a customer and the strangest thing is happening to me. I pull in a list of videos from a database table and it plays the video that I want it to, this all works fine.

  For some reason some of the video files will not play in either chrome nor Firefox when viewing my page from an .erb file,but they will work in Microsoft edge. They will all work in an .html file though in all my browsers they are raw .264 files converted to mp4 via ffmpeg .

  I would think if it was a file corruption it wouldn’t play fine in a .html file or Edge.

  <% links[0,1].each do |links|%>-->
  
  
  
  <% if  links[1] == "Not_Watched"%>
  
  
  
  <video width="320" height="240" controls="controls">
  
  <source src="../videos/&lt;%=links[0]%>" type="video/mp4">
  
  
  
  </source></video>
  
  &lt;%end%>
  
  &lt;%end%>
  
  
  
   get '/page1' do
  
  
  
  
  
  thing1= database.execute("select * from thing1");
  
  thing2= database.execute("select * from thing2")                
  
  links = database.execute("select * from links")                 
  
  
  
  
  
  
  
     erb :page1, :locals => {:thing1=> thing1, :thing2=> thing2, :links => links}
  
  
  
  
  
  
  
   end

  I had to change some of the code names up because i cant put up to much of this code online...... and there is a lot more I didn’t include because didn’t have anything to do with anything as far as I could imagine. If anyone thinks it could have a bearing ill post some of it but changed up so that I can