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• How can i have a good frame quality with PHP5-FFMPEG ?

  13 mars 2012, par Yeppao

  I'm trying tu use PHP5-FFMPEG in my website, but when i try to take some frame of any movie, the quality of this frame is really poor...

  Here's the simply way i use to write this frames into images.

    $frame = $mov->getFrame($_GET['frame']);
  
    $img = $frame->toGDImage();
  
    header("Content-type: image/jpeg");
  
    imagejpeg($img);

  Can i have a better quality with this extension ? Or I have to invoke a ffmpeg command line ?

  Image link :
  http://i.stack.imgur.com/OKXUj.jpg

• FFMPEG : Mapping Decoded frame buffer to FFMPEG's output frame buffer

  9 décembre 2013, par Zax

  I have integrated my custom decoder into FFMPEG's multimedia framework.
  I have the AVCodec structure inside my video decoder as shown below :

  AVCodec ff_hello_decoder = {
  
  
  
      .name           = "myDec",
  
      .type           = AVMEDIA_TYPE_VIDEO,
  
      .id             = AV_CODEC_ID_HELLO,
  
      .init           = myDec_decode_init,
  
      .close          = myDec_decode_close,
  
      .decode         = myDec_decode_frame,
  
      .pix_fmts       = (const enum AVPixelFormat[]) {AV_PIX_FMT_YUV420P},
  
  };

  In function myDec_decode_init() i perform all initializations, memory allocation etc. In function myDec_decode_close(), all the allocated memory is deallocated. In function myDec_decode_frame(), i read the input stream, and decode a frame as shown below :

  static int myDec_decode_frame(AVCodecContext *avctx, void *data,int *got_frame_ptr, AVPacket *avpkt)
  
  {
  
  
  
       AVFrame *frame=data;
  
       unsigned char *YUVptr;
  
  
  
       //Here i read the input stream and pass it to the decoder.
  
  
  
       //Decoder gives me a address that points to the YUV data, i collect the address in YUVptr as shown below
  
  
  
       YUVptr=myDecodeFrame(...);
  
  
  
       //Inorder to map this pointer to the output frame pointer provided by ffmpeg, i perform the below operation
  
       frame->buf=YUVptr;
  
  
  
       //give indication to ffmpeg framework that the data has been mapped to frame buffer
  
       *got_frame_ptr=1;
  
  
  
       return 0;
  
  
  
  }

  When i execute the ffmpeg command from terminal i get the following message :

  ./ffmpeg -vcodec myDec -i input.bin output.yuv
  
  
  
  Codec 0xFF1081 is not in the full list
  
  
  
  Output file #0 does not contain any stream

  My Question is :

  1) Why am i getting the first message i.e. Codec ... is not in the full list ? What has to be done to get this solved

  2) Why am i getting the message Output file #0 does not contain any stream, althought in the definition of AVCodec i have specified that pix_fmts are of type AV_PIX_FMT_YUV420P ? How can this be resolved ?

  3) Lastly, i still doubt, that i'm actually not mapping the yuv buffer data properly with the ffmpeg's output buffer pointer i.e. void* data parameter. Am i doing something wrong here ?

  Any information regarding the same shall be really helpful to me. Please do provide you valuable suggestions. Thanks in advance.

• FFSERVER streaming to any network

  7 février 2012, par user1191644

  Is there some way to stream a media file using ffserver to any network from a local network as my ffserver is configured on subnet machine.

  Right now I have it working only machines on the LAN (connected to my network) can view the file using http://localhost:8090/stream.mjpg , but I want people from the outside or any network also to be able to access it if they provide my machine address. Can anybody provide me some ideas on this.

  Thanks !