Newest 'ffmpeg' Questions - Stack Overflow

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• Can i use just ffmpeg ?

  7 février 2012, par Someone Like You

  I have a video sharing site, it uses phpmotion, i tried cliipbucket also, i didn't like any of the scripts, i decided to create my own script, using django and maybe pinax. the other 2 scripts, use ffmpeg, and many other stuff like ffmpeg-PHP, Mplayer, Mencoder, flv2tool, LAME MP3 Encoder, and Libog

  i know that i won't need ffmpeg-php since i'm not gonna be using php, but do i really need those other things? can i just use ffmpeg to do all the work? i don't understand what the other stuff are used for.

• logos and subtitles in reverse using ffmpeg and OpenGL in iOS 5.0

  6 février 2012, par resident_

  I am using ffmpeg to play video on iOS 5.0. In my app with ffmpeg decoded video frames and use OpenGL to display it.

  But I have a problem I don't resolve it. Chains logos and subtitles of the video image is displayed in reverse. I think that is the problem of rendering OpenGL 2.0 or ffmpeg decoded.

  Can you tell me what is wrong?, and How I can fix it?

  Very thanks,

  Edit: I change my prepareTExture method with this:

  - (void) prepareTextureW: (GLuint) texW textureHeight: (GLuint) texH frameWidth: (GLuint) frameW frameHeight: (GLuint) frameH {
  
  float aspect = (float)frameW/(float)frameH;
  float minX=-1.f, minY=-1.f, maxX=1.f, maxY=1.f;
  float scale ;
  if(aspect>=(float)backingHeight/(float)backingWidth){
      // Aspect ratio will retain width.
      scale = (float)backingHeight / (float) frameW;
      maxY = ((float)frameH * scale) / (float) backingWidth;
      minY = -maxY;
  } else {
      // Retain height.
      scale = (float) backingWidth / (float) frameW;
      maxX = ((float) frameW * scale) / (float) backingHeight;
      minX = -maxX;
  }
  if(frameTexture) glDeleteTextures(1, &frameTexture);
  glEnable(GL_TEXTURE_2D);
  glGenTextures(1, &frameTexture);
  glBindTexture(GL_TEXTURE_2D, frameTexture);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texW, texH, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, NULL);          
  
  
   verts[0] = maxX;           
    verts[1] = maxY;
    verts[2] = minX;      
    verts[3] = maxY;
    verts[4] = maxX;  
    verts[5] = minY;
    verts[6] = minX;    
    verts[7] = minY;
  
  float s = (float) frameW / (float) texW;
  float t = (float) frameH / (float) texH;             
  
  texCoords[0] = 0.f;        texCoords[1] = 1.f;
  texCoords[2] = 1;          texCoords[3] = 1.f;
  texCoords[4] = 0.f;        texCoords[5] =0;
  texCoords[6] = 1;          texCoords[7] =0;
  
  mFrameH = frameH;
  mFrameW = frameW;
  mTexH = texH;
  mTexW = texW;
  maxS = s;
  maxT = t;
  
  // Just supporting one rotation direction, landscape left.  Rotate Z by 90 degrees.
  matSetRotZ(&rot,M_PI_2);
  
  matMul(&mvp, &rot, &rot);
  [self setupShader];    
  

  }

  And now this is my result: link image

• ffmpeg : create interlaced output from progrssive input

  6 février 2012, par user1190908

  I have a 720p60 (54.94 to be exact) clip that I would like to scale down and output in 540i30 (27.97 to be exact).

  Here is my command line:

  ffmpeg.exe -i clip720p60.m2t -ss 90 -t 30 -vcodec libxvid -s 960x540 -b 1000k -r 29.97 -acodec libmp3lame -ar 22050 -ab 64k -f avi clip540i30.avi
  ...
  Input #0, mpegts, from 'clip720p60.m2t':
    Duration: 01:53:55.76, start: 0.196678, bitrate: 17250 kb/s
    Program 1
      Stream #0.0[0x1011]: Video: h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 59.94 tb(r)
      Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 384 kb/s
  Output #0, avi, to 'clip540i30.avi':
      Stream #0.0: Video: libxvid, yuv420p, 960x540 [PAR 1:1 DAR 16:9], q=2-31, 1000 kb/s, 29.97 tb(c)
      Stream #0.1: Audio: libmp3lame, 22050 Hz, stereo, s16, 64 kb/s
  ...
  

  The first options indicates to encode 30s at 90s past the start.

  Whatever options I tried up to now always end up with a video stream of 60s and an audio stream of 30s in the output clip.

  Can any one help me?

• FFserver : Securing with HTTP Authentication ? (Apache ?)

  6 février 2012, par mdaddy

  Is there some way to secure an ffserver webcam stream using Apache / HTTP Authentication? Some type of Apache proxy perhaps?

  Right now I have it so only machines on the LAN can view the http://webcam/stream.mjpg, but I want people from the outside to be able to access it if they provide a username / pw (HTTP Auth, which isn't built into ffserver).

  Thanks!

• Any updated http segmenter for IPad / iPhone video streaming with latest ffmpeg ?

  5 février 2012, par ipegasus

  I would like to know if there are any http file segmenters with support for the latest ffmpeg libraries?

  So far I have found some projects, although I haven't been able to compile them using ffmpeg 0.9

  1. http://svn.assembla.com/svn/legend/segmenter/
  2. http://www.ioncannon.net/programming/452/iphone-http-streaming-with-ffmpeg-and-an-open-source-segmenter/

  Thanks!