• Compression Techniques

  FFmpeg 0.60 Problem – unsupported codec

  Posted by Tom Pepe on July 30, 2010 at 7:53 am

  Hello,

  i’ve got a strange problem with ffmpeg. Im trying to extend my Software with a small Videoplayer-feature. What i have to do is just to open a videofile and read the images. I only need the videodata of a video, because its a computer vision application.

  So i found a website which descibes how to do this. (https://dranger.com/ffmpeg/tutorial01.html)
  I use ffmpeg 0.60 for this application, which I’ve downloaded from the ffmpeg website.

  I’ve builded ffmpeg with the following configurations:

  ./configure –enable-gpl –enable-swscale –enable-nonfree

  After make and make install I’ve copied the lib and headerfiles to my Projectdirectory. (It’s a Qt-Project)

  Here is the sourcecode i use to open a videofile (Its just the code from the tutorial):

  
int FFmpegHandler::openVideoStream(QString fileName)
{
AVFormatContext *pFormatCtx;
int i, videoStream;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVFrame *pFrameRGB;
AVPacket packet;
int frameFinished;
int numBytes;
uint8_t *buffer;

  // Register all formats and codecs
  av_register_all();

  // Open video file
  if(av_open_input_file(&pFormatCtx, fileName.toLatin1(), NULL, 0, NULL)!=0)
  return -1; // Couldn't open file

  // Retrieve stream information
  if(av_find_stream_info(pFormatCtx)<0)
  return -1; // Couldn't find stream information

  // Dump information about file onto standard error
  dump_format(pFormatCtx, 0, fileName.toLatin1(), false);

  // Find the first video stream
  videoStream=-1;
  for(i=0; inb_streams; i++)
  if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
  {
  videoStream=i;
  break;
  }
  if(videoStream==-1)
  return -1; // Didn't find a video stream

  // Get a pointer to the codec context for the video stream
  pCodecCtx=pFormatCtx->streams[videoStream]->codec;

  // Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL)
{
fprintf(stderr, "Unsupported codec!n");
return -1; // Codec not found
}
return 0;
}


  So when im running my application it always outputs in the console:

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘/home/pollok/Desktop/out-7.mp4’:
  Duration: 00:00:35.00, start: 0.000000, bitrate: 451 kb/s
  Stream #0.0(und): Video: mpeg4, yuv420p, 320×240 [PAR 1:1 DAR 4:3], 15,00 tb(r)
  Stream #0.1(und): Audio: libfaad, 48000 Hz, stereo
  Unsupported codec!

  But when I use ffplay to display the video it works without prolems… What am I doing wrong? I need help urgent, because I’m trying to programm that since one week.

  FFplay outputs the following: (This is an older Version of ffmpeg, which was already preinstalled on my Linux)

  FFplay version SVN-r13582, Copyright (c) 2003-2008 Fabrice Bellard, et al.
  configuration: –prefix=/usr –libdir=${prefix}/lib –shlibdir=${prefix}/lib –bindir=${prefix}/bin –incdir=${prefix}/include/ffmpeg –enable-shared –enable-libmp3lame –enable-gpl –enable-libfaad –mandir=${prefix}/share/man –enable-libvorbis –enable-pthreads –enable-libfaac –enable-libxvid –enable-postproc –enable-libamr-nb –enable-libamr-wb –enable-x11grab –enable-libgsm –enable-libx264 –enable-liba52 –enable-libtheora –extra-cflags=-Wall -g -fPIC -DPIC –cc=ccache cc –enable-swscale –enable-libdc1394 –enable-nonfree –disable-mmx –disable-stripping –enable-avfilter –enable-libdirac –disable-decoder=libdirac –enable-libschroedinger –disable-encoder=libschroedinger –disable-altivec –disable-armv5te –disable-armv6 –disable-vis
  libavutil version: 49.7.0
  libavcodec version: 51.58.0
  libavformat version: 52.16.0
  libavdevice version: 52.0.0
  libavfilter version: 0.0.0
  built on May 3 2009 12:02:42, gcc: 4.3.2

  My lib version, which i have compiled is:
  libavcodec.52.72.2
  libavdevice.52.2.0
  libavfilter.1.19.0
  libavformat.52.64.2
  libavutil.50.15.1
  libpostproc.51.2.0
  libswscale.0.11.0

  Can anybody help me? Im thankful for every idea.

  Nice regards,

  Tom

  Michael Rampe replied 15 years, 11 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Michael Rampe

  August 3, 2010 at 5:28 am

  [tom pepe] “I’ve builded ffmpeg with the following configurations:

  ./configure –enable-gpl –enable-swscale –enable-nonfree”

  You have not installed or enabled the libfaad or libfaac libraries. This is why it is reporting:

  [tom pepe] “Unsupported codec!”

  Your ffplay does have these libraries installed and configured. This is why it works in FFplay but not FFmpeg.

  add –enable-libfaad and –enable-libfaac to your FFmpeg configure line.

  Michael

  “half-way to world domination A.K.A. the belligerent blue bike shed”
• 

  Tom Pepe

  August 3, 2010 at 9:34 am

  [Michael Rampe]You have not installed or enabled the libfaad or libfaac libraries. This is why it is reporting:

  [tom pepe] “Unsupported codec!”

  [Michael Rampe]Your ffplay does have these libraries installed and configured. This is why it works in FFplay but not FFmpeg.

  add –enable-libfaad and –enable-libfaac to your FFmpeg configure line.

  But when you have a look at the sourcecode:

  
// Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;

  // Find the decoder for the video stream
  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  if(pCodec==NULL)
  {
  fprintf(stderr, "Unsupported codec!n");
  return -1; // Codec not found
  }

  libfaad and libfaac are en- and decoder for audiostreams.
  But I never access to the audio channel – only to the video channel.

  So why should this be the solution for my problem?

  Nice Regards,

  Tom

  PS: Thanks for your reply.
• 

  Michael Rampe

  August 3, 2010 at 11:57 pm

  It appears that there is an audio stream in your input. Unless FFmpeg is told to ignore the audio (using -an for example on the command line), it will pass the stream through to the output. That is why I think you are having the problem of unsupported codec.

  Michael

  “half-way to world domination A.K.A. the belligerent blue bike shed”

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