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• Can javascript MSE play segmented mp4 from the middle ?

  10 juillet 2020, par Elias Wagnerberger

  in my current project i have a video stream that ffmpeg encodes to a segmented mp4. that encoded data is piped into an application that sends that data to whomever connects to that application through a websocket. when a client connects i make sure to send the ftyp and the moov boxes first and then send the most recent segments recieved from ffmpeg.

  


  on the client side i just pass all binary data from the websocket to MSE.

  


  The problem i am facing is that this works if the client is connected from the very start and gets all the fragments that ffmpeg pipes out, but it does not work if the client connects in after ffmpeg sends its first few fragments.

  


  My question is :
Is it possible for MSE to play a fragmented mp4 from the middle when it is also provided the init segments ?

  


  If it is possible then how would that need to be implemented ?

  


  if it isnt possible then what format would allow me to stream live video over a websocket ?

  


• Android and Ffmpeg. Play video (audio and video syncing WITHOUT USING SDL)

  21 janvier 2014, par user1885632

  I have build ffmpeg library and made simple project where I decode video stream and show it on SurfaceView. Now I need to play sound stream of my video file. And the biggest problem for me is synchronization. I saw tutorials but all of them show how to do this using SDL. But for this I need to install SDL, build it (and there are some trouble for me, because of my project structure). So I don't want to use SDL. Are there any ways how to play a videofile with sound synchronously without using SDL ?

• Compressed mp4 video is taking too long time to play (exoplayer)

  10 août 2018, par User

  Video(mp4) is recorded from android camera and sent to backend, here I am using ffmpeg wrapper to compress the video[44mb video to 5.76mb]. compression is working well, But when I send the video for play in android(exo player), is taking too long time to start.

  below is my code to compress :

   FFmpegBuilder builder = new FFmpegBuilder()
  
                     .setInput("D:/dummyVideos/myvideo.mp4")     // Filename, or a FFmpegProbeResult
  
                     .overrideOutputFiles(true) // Override the output if it exists
  
                     .addOutput("D:/dummyVideos/myvideo_ffmpeg.mp4")   // Filename for the destination
  
                     .setFormat("mp4")       // Format is inferred from filename, or can be set
  
                     .disableSubtitle()       // No subtiles
  
                     .setAudioChannels(1)         // Mono audio
  
                     .setAudioCodec("aac")       // using the aac codec
  
                     .setAudioSampleRate(48_000) // at 48KHz
  
                     .setAudioBitRate(32768)     // at 32 kbit/s
  
                     .setVideoCodec("libx264")     // Video using x264
  
                     .setVideoFrameRate(24, 1)     // at 24 frames per second 
  
                     .setVideoResolution(1280, 720) // at 640x480 resolution
  
                     .setVideoBitRate(762800)
  
                     .setStrict(FFmpegBuilder.Strict.EXPERIMENTAL) // Allow FFmpeg to use experimental specs
  
                     .done();

  Can anyone tell me why video is taking too long time to play in exo player ? Is anything wrong in the compression ?