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• Playing audio/video on-demand with overlay ?

  1er juillet 2012, par Jeff Huijsmans

  I'm currently busy working on a TV-station app, which I'm writing in C#. However, C# lacks (good) support for audio-video output, let alone with an overlay (logo's, "Next up : [episode]" etc.).

  My question is : is there a programming language that has good (native) support for playing back audio/video with support for overlays ?

  I already tried Java + Xuggle (I can't find enough examples), C# + about 3 different plugins.

• x264 & libavcodec

  25 janvier 2012, par moose

  After some considerable amount of time while trying to build the ffmpeg static library with the x264 encoder on Windows, I have spent some more time for writing some example with it.
  Of course, there are tons of "instructions" on how to build, how to use, bla bla... But, non of them works on Windows. I guess the Linux guys are in better position here. Now, the zillion dollars question is "What's the purpose of all that ?". Not only that this is useless on Windows, but I could have bought some third party library that actually works.

  If somebody is about to say "But, it works !". I must say, give me a working proof. I don't care about 200x100 at 10fps. I don't need H264 for that. Show me how to compress a single second of 1080i footage. It's H264, it's crossplatform (sounds funny if you ask me), Google is using it (it has to be perfect, right ?), some more hipe here...

• FFMPEG API (compiling with specific formats)

  14 janvier 2012, par JS.

  I am trying to compile FFMPEG to support a single video type (*.mp4).

  I have everything working when I compile for all, but I do not want the extra over-head when I will only use a single format.

  Here's my compile FLAGS now (non-working for MP4). I am sure there are other codecs/decoders I need to specifically enable, but am just having a hard time finding them.

  Compiler directives showing the build flags below :

  FLAGS="$FLAGS --disable-everything"
  
  FLAGS="$FLAGS --enable-encoder=mpeg4video" ## This is the question, what all needs enabling?

  I just do not know video standards well enough to know exactly which codecs / encoders / etc. to turn on.

  av_register_all();
  
  avdevice_register_all();
  
  
  
  byteCtx = av_alloc_put_byte(buffer, BUFFER_SIZE, 0, f, ReadFunc, NULL, SeekFunc);
  
  if (!byteCtx) {
  
      return;
  
  }
  
  // Open video file (here's the failure, doesn't happen when compiled for all)
  
  inputFormat = av_find_input_format("MP4");
  
  if (!inputFormat) {
  
      LOGE(ANDROID_LOG_ERROR, "NDK:", "Null inputformat!");
  
      return;
  
  }