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• Merge two or more video files of any format using FFmpeg in iPhone

  20 juillet 2012, par Subhash

  Is there any direct command in FFmpeg to merge videos in iPhone. I need to do this programmatically by setting the command line argument to the FFmpeg containing the input movie files to merge and the output file name.

  ---

  I just wanted to merge two .mov movie files using FFmpeg. I was trying to do this in iPhone where I was creating a command line argument containing two video fies to merge as an input parameter and the destination video file as output parameter and then calling main method of FFmpeg. But for merging videos using FFmpeg first we need to convert it to mpg format and then pass the movie files in mpg format in the command line format. This is the only way found to merge the video using FFmpeg as far as I know. Is there anybody out there done this in a different way ?

• YUV to RGB by Shader on iPhone

  27 octobre 2012, par user1333656

  Currently I am developing a video player using FFMPEG.
  I'm trying to convert YUV420P to RGB by Shader to reduce performance hit and I could see it works fine. The problem is caused when I try to change image size.

  Case 1. YUV to RGB is perfect. but the image is not exactly fit to Texture Bounds.
  For example, if i play 640x360 video, right (640-512) part is cropped and bottom (512-360) is filled with green colored rectangle.

  FRAME_X=512; //This is texture size
  
  FRAME_Y=512;
  
  
  
      avpicture_fill((AVPicture *) f, [currentVideoBuffer.data mutableBytes],
  
                 enc->pix_fmt,
  
                 FRAME_X, FRAME_Y);
  
  
  
      av_picture_copy((AVPicture *) f, (AVPicture *) avFrame,
  
                  enc->pix_fmt,
  
                  enc->width, enc->height);

  ....

  int yuvWidth= FRAME_X ;
  
  int  yuvHeight= FRAME_Y;
  
  glBindTexture ( GL_TEXTURE_2D, textureIdY );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 
  
  yuvWidth, yuvHeight, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, y_channel);
  
  
  
  
  
  glBindTexture ( GL_TEXTURE_2D, textureIdU );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE,
  
  yuvWidth/2, yuvHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, u_channel);
  
  
  
  glBindTexture ( GL_TEXTURE_2D, textureIdV );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 
  
  yuvWidth/2, yuvHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, v_channel);

  Case 2. If i set actual image size to texture size, then image is exactly fit to texture but the color of image is a little bit strange. It has too much green color.

  Does anybody give me some clues for this ??
  Thanks in advance.

• How to convert iphone's caf to ogg on ubuntu

  24 novembre 2012, par Amure Pinho - Syncmobile

  i really need your support to solve that problem :

  We developed an iOS application that sends a sound file to our server and then, we share this audio.

  The problem is we didnt find any solution to convert the audio inside the iOS.

  We tought : Ok, thats a problem, but we can still convert the audio in the server right ?

  We are trying to make this using afconvert, ffmpeg but with no sucess.

  Do you have any basic guide or hint so we can write this in our server application and convert all the .CAF files to another format like OGG or MP3 ?

  Thanks a lot !