Recherche avancée

Sur d’autres sites (7458)

• Where can I find modern tutorials for libav, ffmpeg, etc ? [on hold]

  19 décembre 2016, par Marty

  I want to make a quick program in C that will open a video, save each frame as a ppm, and dump motion vectors. All the tutorials I can find are from almost ten years ago and call deprecated or non-existent functions.

  Are there any good online resources, websites, videos, or textbooks that cover a modern approach to doing these types of things ?

• Encoding Android Camera Frames h263/h264 [on hold]

  29 décembre 2015, par Another Guy

  I want to implement a Video Chatting app on Android . I created a SurfaceView , get Camera preview and captured the frame as a byte[ ] using Camera.PreviewCallback.onPreviewFrame( ) method . Now I want to encode that byte[ ] to a h263 frame , pass over the network . Also get similar type of frame over network , decode it to a byte[ ] ( or a displayable format ) , and show it in a View . I want to do it at least 15 FPS rate . I am asking help for the encoding/decoding part .

  For that purpose , which library would be suitable for me ? From where I should start ? Is my starting point wrong ? Is there any support on SDK or would I have to use NDK ? I have heard about FFMpeg/x264 library , but I could not figure out how I can use them in my purpose . It’s highly appreciated If you name any library , any reference , learning path , link or code snippet . Can you help me saying any workflow I should follow ? What if I want to use h264 encoding ? I just want to get it done , GPL/LGPL license of library would not matter a lot .

  I am a beginner in Android development . Any kind of assistance would be highly appreciated . Thanks in advance .

• iPhone camera live steaming

  15 juin 2012, par Inder Kumar Rathore

  I have downloaded ffmpeg lib file and complied it for armv7. I added ffmpeg lib files in my project successfully. i am able to get iphone camera live streams using AVFoundation.

  Now the problem is how will i convert iphone camera streams output as a input of ffmpeg for decode ? Check my code

  - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
  
  
  
  
  
  CMBlockBufferRef bufferData = CMSampleBufferGetDataBuffer(sampleBuffer);
  
  size_t lengthAtOffset;
  
  size_t totalLength; char* data; 

  if(CMBlockBufferGetDataPointer(bufferData, 0, &lengthAtOffset, &totalLength, &data ) != noErr )
  NSLog(@"error !") ;
  
  

  Kindly suggested me which function of ffmpeg lib is used for decoding and how will i put CMBlockBufferRef as a input of this ??

  Thanks