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• Revision 4ccfc7d517 : Save an extra call for setup_pred_plane function Reuse the yv12_mb array to fet

  4 février 2015, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Save an extra call for setup_pred_plane function

  Reuse the yv12_mb array to fetch the buffer pointers/strides
  corresponding to the current reference frame.

  Change-Id : I5276b7494158b2cccef15213be2dc189e9036851

• Save Slow motion video with ffmpeg on android devices

  25 mars 2017, par nkalra0123

  I want to save videos in slow motion through my android app.I tried to convert videos into slow motion by changing frame rate.

  I used the following commands,first command is dumping 30 frames per second from videos to a temp directory, and then second command is using these images to create a video with reduced or faster frame rate and then i am deleting all the images from temp directory.

  ffmpeg -i input_file.mp4 -r 30/1 img%03d.png
  
  
  
  ffmpeg -framerate 15/1 -i img%03d.png -r 30 -pix_fmt yuv420p out4.mp4

  But this is a very slow operation. It is taking like forever even for small videos.

  I even tried to change PTS(presentation time stamp) of videos, but it is not working properly on android phones
  using this command :

  ffmpeg -i input.mkv -filter:v "setpts=2.0*PTS" output.mkv

  as suggested here :
  https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video

  Can anybody suggest me how can i make it fast. Is it necessary to save frames to a temp directory, can i pass the output of ffmpeg process to another ffmpeg process executing concurrently through some method.

  Is there any other ffmpeg command to save the videos in slow motion ?

• ffmpeg save mp3 file from available wss stream

  11 juillet 2021, par phoenixAZ

  In a hello world node.js app I am succeeding in getting a feed from twilio conference and sending to the google speech to text. Concurrently I want to control recording to mp3 of the available audio stream (programmatically call start and stop). The was is subscribed to audio stream but I don't know how to attach ffmpeg to the local stream. I have tried :

  


              // ffmpeg('rtsp://host:port/path/to/stream')
            //experimenting telling it to use the local stream
            //
            //ffmpeg(wss.addListener)  //invlaid input error
            //ffmpeg(wss.stream) //thsi hits the console error below
            ffmpeg(wss.stream)
            .noVideo()
            .audioChannels(1)
            .audioBitrate(128)
            .duration('1:00')
            .on('end', function () { console.log('saved mp3'); })
            .on('error', function (err) { console.log('error mp3'); })
            .save('/path/to/output.mp3');


  


  Any suggestions are welcomed. I am in a node.js project