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• Installing full multimedia stack on server (ffmpeg,mp4box,sox,mplayer)

  29 avril 2015, par hdezela

  I’ve had a trusty text file with all(?) the steps I need to set up a full multimedia stack on a RHEL compatible server (CentOS, AWS Linux, etc.) for a few years now. However, sometimes some things are missing and I need to revise it. I know it is not complete so I’m asking for suggestions/modifications in order to get a good - and public - list of how to install all this stuff easily.

  Ideally, I want to be able to run through the file and end up with a system that’ll take any media file and be able to convert/encode/decode/whatever with it.

  This is what I have :

  yum install mesa-libGL-devel mesa-libGLU-devel libXi-devel libXmu-devel freeglut-devel freeglut ncurses-devel
  
  cd /usr/local/src
  
  mkdir /usr/local/src/tmp
  
  chmod 777 /usr/local/src/tmp
  
  export TMPDIR=/usr/local/src/tmp
  
  
  
  wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
  
  wget http://downloads.xiph.org/releases/ogg/libogg-1.3.2.tar.gz
  
  wget http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.4.tar.gz
  
  wget http://downloads.xiph.org/releases/theora/libtheora-1.1.1.tar.gz
  
  wget ftp://ftp.videolan.org/pub/videolan/x264/snapshots/last_stable_x264.tar.bz2
  
  wget http://downloads.sourceforge.net/project/opencore-amr/opencore-amr/opencore-amr-0.1.3.tar.gz
  
  wget http://downloads.sourceforge.net/faac/faac-1.28.tar.gz
  
  wget http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
  
  wget http://webm.googlecode.com/files/libvpx-v1.3.0.zip
  
  wget http://downloads.sourceforge.net/project/yamdi/yamdi/1.9/yamdi-1.9.tar.gz
  
  wget http://rtmpdump.mplayerhq.hu/download/rtmpdump-2.3.tgz
  
  git clone https://github.com/FFmpeg/FFmpeg.git
  
  wget http://downloads.sourceforge.net/gpac/gpac-0.5.0.tar.gz
  
  wget http://downloads.sourceforge.net/gpac/gpac_extra_libs-0.5.0.tar.gz
  
  wget http://www.mplayerhq.hu/MPlayer/releases/codecs/all-20110131.tar.bz2
  
  wget http://www.mplayerhq.hu/MPlayer/releases/MPlayer-1.1.tar.xz
  
  wget https://bitbucket.org/acoustid/chromaprint/downloads/chromaprint-fpcalc-1.1-linux-x86_64.tar.gz
  
  wget http://sourceforge.net/projects/mad/files/madplay/0.15.2b/madplay-0.15.2b.tar.gz
  
  wget http://sourceforge.net/projects/mad/files/libmad/0.15.1b/libmad-0.15.1b.tar.gz
  
  wget http://sourceforge.net/projects/mad/files/libid3tag/0.15.1b/libid3tag-0.15.1b.tar.gz
  
  wget http://sourceforge.net/projects/sox/files/sox/14.4.1/sox-14.4.1.tar.gz
  
  wget http://downloads.xiph.org/releases/ao/libao-1.2.0.tar.gz
  
  wget http://downloads.sourceforge.net/twolame/twolame-0.3.13.tar.gz
  
  wget http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.25.tar.gz
  
  wget http://www.wavpack.com/wavpack-4.70.0.tar.bz2
  
  wget http://www.linuxfromscratch.org/patches/blfs/svn/libmad-0.15.1b-fixes-1.patch
  
  
  
  tar zxf yasm-1.3.0.tar.gz
  
  tar zxf libogg-1.3.2.tar.gz
  
  tar zxf libvorbis-1.3.4.tar.gz
  
  tar zxf libtheora-1.1.1.tar.gz
  
  tar jxf last_stable_x264.tar.bz2
  
  tar zxf opencore-amr-0.1.3.tar.gz
  
  tar zxf faac-1.28.tar.gz
  
  tar zxf lame-3.99.5.tar.gz
  
  unzip libvpx-v1.3.0.zip
  
  tar xzf yamdi-1.9.tar.gz
  
  tar xzf rtmpdump-2.3.tgz
  
  tar zxvf gpac-0.5.0.tar.gz
  
  tar zxvf gpac_extra_libs-0.5.0.tar.gz
  
  tar jxf all-20110131.tar.bz2
  
  tar jxf MPlayer-1.1.tar.xz
  
  tar xf chromaprint-fpcalc-1.1-linux-x86_64.tar.gz
  
  tar xf madplay-0.15.2b.tar.gz
  
  tar xf libmad-0.15.1b.tar.gz
  
  tar xf libid3tag-0.15.1b.tar.gz
  
  tar xf sox-14.4.1.tar.gz
  
  tar xf libao-1.2.0.tar.gz
  
  tar xf twolame-0.3.13.tar.gz
  
  tar xf libsndfile-1.0.25.tar.gz
  
  tar jxf wavpack-4.70.0.tar.bz2
  
  
  
  [YASM]
  
      cd /usr/local/src/yasm-1.3.0
  
      ./configure && make && make install
  
      yasm --version
  
      ldconfig
  
  [LIBOGG]
  
      cd /usr/local/src/libogg-1.3.2
  
      ./configure && make clean && make && make install
  
      ls /usr/local/lib/libogg*
  
      ldconfig
  
  [LIBVORBIS]
  
      cd /usr/local/src/libvorbis-1.3.4
  
      ./configure && make clean && make && make install
  
      ls /usr/local/lib/libvorbis*
  
      ldconfig
  
  [LIBTHEORA]
  
      cd /usr/local/src/libtheora-1.1.1
  
      ./configure && make clean && make && make install
  
      ls /usr/local/lib/libtheora*
  
      ldconfig
  
  [x264]
  
      cd /usr/local/src/x264-snapshot-[***]
  
      ./configure --enable-shared && make clean && make && make install
  
      ls /usr/local/lib/libx264*
  
      ldconfig
  
  [AMR]
  
      cd /usr/local/src/opencore-amr-0.1.3
  
      ./configure && make clean && make && make install
  
      ls /usr/local/lib/libopencore*
  
      ldconfig
  
  [FAAC]
  
      cd /usr/local/src/faac-1.28
  
      vi /usr/local/src/faac-1.28/common/mp4v2/mpeg4ip.h [ELIMINAR]:char *strcasestr(const char *haystack, const char *needle);
  
      ./configure && make && make install
  
      ls /usr/local/lib/libfaac*
  
      ldconfig
  
  [LAME]
  
      cd /usr/local/src/lame-3.99.5
  
      ./configure && make clean && make && make install
  
      ls /usr/local/lib/libmp3lame*
  
      ldconfig
  
  [GPAC+MP4BOX]
  
      cd  /sr/local/src/gpac
  
      cp -r ../gpac_extra_libs/* extra_lib/
  
      chmod +x configure
  
      ./configure
  
      make lib
  
      make apps
  
      make install-lib
  
      make install
  
      cp bin/gcc/libgpac.so /usr/lib
  
      ldconfig
  
  [LIBVPX]
  
      cd /usr/local/src/libvpx-v1.3.0
  
      ./configure --enable-vp8  --enable-pic --enable-shared && make && make install
  
      ls /usr/local/lib/libvpx*
  
      ldconfig
  
  [LIBRTMP]
  
      cd /usr/local/src/rtmpdump-2.3
  
      make SYS=posix
  
      make install
  
      ls /usr/local/lib/librtm*
  
      ldconfig
  
  [FFMPEG]
  
      cd /usr/local/src/FFmpeg
  
      export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/usr/local/lib/pkgconfig"
  
      ./configure  --enable-gpl --enable-version3 --enable-nonfree --enable-shared --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvpx --enable-libvorbis --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrnb  --enable-libtheora --enable-librtmp
  
      make clean && make && make install
  
      make tools/qt-faststart
  
      cp tools/qt-faststart /usr/local/bin/
  
      ldconfig
  
      ffmpeg
  
      qt-faststart
  
  [MPLAYER]
  
      mv /usr/local/src/all-20110131 /usr/local/lib/codecs/
  
      chmod -R 755 /usr/local/lib/codecs/
  
      cd MPlayer-1-1
  
      make clean
  
      ./configure && make && make install
  
      ldconfig
  
  [YAMDI]
  
      cd /usr/local/src/yamdi-1.9
  
      gcc yamdi.c -o yamdi -O2 -Wall
  
      strip yamdi
  
      cp yamdi /usr/bin/yamdi
  
      yamdi -h
  
  [MEDIAINFO]
  
      rpm -ivh http://downloads.sourceforge.net/zenlib/libzen0-0.4.31-1.x86_64.CentOS_6.rpm
  
      rpm -ivh http://sourceforge.net/projects/mediainfo/files/binary/libmediainfo0/0.7.73/libmediainfo0-0.7.73-1.x86_64.CentOS_6.rpm
  
      rpm -ivh http://sourceforge.net/projects/mediainfo/files/binary/mediainfo/0.7.73/mediainfo-0.7.73-1.x86_64.CentOS_6.rpm
  
  [CHROMAPRINT]
  
      cp /usr/local/src/chromaprint-fpcalc-1.1-linux-x86_64/fpcalc /usr/local/bin/fpcalc
  
  [LIBAO]
  
      cd /usr/local/src/libao-1.2.0
  
      ./configure
  
      make
  
      make install
  
      ldconfig
  
  [LIBSND]
  
      cd /usr/local/src/libsndfile-1.0.25
  
      ./configure
  
      make
  
      make install
  
      ldconfig
  
  [TWOLAME]
  
      cd /usr/local/src/twolame-0.3.13
  
      ./configure
  
      make
  
      make install
  
      ldconfig
  
  [WAVPACK]
  
      cd /usr/local/src/wavpack-4.70.0
  
      ./configure
  
      make
  
      make install
  
      ldconfig
  
  [LIBMAD]
  
      cd /usr/local/src/libmad-0.15.1b
  
      patch -Np1 -i ../libmad-0.15.1b-fixes-1.patch
  
      sed "s@AM_CONFIG_HEADER@AC_CONFIG_HEADERS@g" -i configure.ac
  
      touch NEWS AUTHORS ChangeLog
  
      autoreconf -fi
  
      ./configure --enable-shared
  
      make
  
      make install
  
      ldconfig
  
  [ID3]
  
      cd /usr/local/src/libid3tag-0.15.1b
  
      ./configure --enable-shared
  
      make
  
      make install
  
      ldconfig
  
  [MADPLAY]
  
      cd /usr/local/src/madplay-0.15.2b
  
      ./configure --enable-shared
  
      make
  
      make install
  
      ldconfig
  
  [SOX]
  
      cd /usr/local/src/sox-14.4.1
  
      ./configure
  
      make -s
  
      make install
  
      ldconfig

• Linux Media Player Survey Circa 2001

  2 septembre 2010, par Multimedia Mike — General

  Here’s a document I scavenged from my archives. It was dated September 1, 2001 and I now publish it 9 years later. It serves as sort of a time capsule for the state of media player programs at the time. Looking back on this list, I can’t understand why I couldn’t find MPlayer while I was conducting this survey, especially since MPlayer is the project I eventually started to work for a few months after writing this piece.

  For a little context, I had been studying multimedia concepts and tech for a year and was itching to get my hands dirty with practical multimedia coding. But I wanted to tackle what I perceived as unsolved problems– like playback of proprietary codecs. I didn’t want to have to build a new media playback framework just to start working on my problems. So I surveyed the players available to see which ones I could plug into and use as a testbed for implementing new decoders.

  Regarding Real Player, I wrote : “We’re trying to move away from the proprietary, closed-source “solutions”. Heh. Was I really an insufferable open source idealist back in the day ?

  Anyway, here’s the text with some Where are they now ? commentary [in brackets] :

  ---

  Towards an All-Inclusive Media Playing Solution for Linux

  I don’t feel that the media playing solutions for Linux set their sights high enough, even though they do tend to be quite ambitious.

  I want to create a media player for Linux that can open a file, figure out what type of file it is (AVI, MOV, etc.), determine the compression algorithms used to encode the audio and video chunks inside (MPEG, Cinepak, Sorenson, etc.) and replay the file using the best audio, video, and CPU facilities available on the computer.

  Video and audio playback is a solved problem on Linux ; I don’t wish to solve that problem again. The problem that isn’t solved is reliance on proprietary multimedia solutions through some kind of WINE-like layer in order to decode compressed multimedia files.

  Survey of Linux solutions for decoding proprietary multimedia
  updated 2001-09-01

  AVI Player for XMMS
  This is based on Avifile. All the same advantages and limitations apply.
  [Top Google hit is a Freshmeat page that doesn’t indicate activity since 2001-2002.]

  Avifile
  This player does a great job at taking apart AVI and ASF files and then feeding the compressed chunks of multimedia data through to the binary Win32 decoders.

  The program is written in C++ and I’m not very good at interpreting that kind of code. But I’m learning all over again. Examining the object hierarchy, it appears that the designers had the foresight to include native support for decoders that are compiled into the program from source code. However, closer examination reveals that there is support for ONE source decoder and that’s the “decoder” for uncompressed data. Still, I tried to manipulate this routine to accept and decode data from other codecs but no dice. It’s really confounding. The program always crashes when I feed non-uncompressed data through the source decoder.
  [Lives at http://avifile.sourceforge.net/ ; not updated since 2006.]

  Real Player
  There’s not much to do with this since it is closed source and proprietary. Even though there is a plugin architecture, that’s not satisfactory. We’re trying to move away from the proprietary, closed-source “solutions”.
  [Still kickin’ with version 11.]

  XAnim
  This is a well-established Unix media player. To his credit, the author does as well as he can with the resources he has. In other words, he supports the non-proprietary video codecs well, and even has support for some proprietary video codecs through binary-only decoders.

  The source code is extremely difficult to work with as the author chose to use the X coding format which I’ve never seen used anywhere else except for X header files. The infrastructure for extending the program and supporting other codecs and file formats is there, I suppose, but I would have to wrap my head around the coding style. Maybe I can learn to work past that. The other thing that bothers me about this program is the decoding approach : It seems that each video decoder includes routines to decompress the multimedia data into every conceivable RGB and YUV output format. This seems backwards to me ; it seems better to have one decoder function that decodes the data into its native format it was compressed from (e.g., YV12 for MPEG data) and then pass that data to another layer of the program that’s in charge of presenting the data and possibly converting it if necessary. This layer would encompass highly-optimized software conversion routines including special CPU-specific instructions (e.g., MMX and SSE) and eliminate the need to place those routines in lots of other routines. But I’m getting ahead of myself.
  [This one was pretty much dead before I made this survey, the most recent update being in 1999. Still, we owe it much respect as the granddaddy of Unix multimedia playback programs.]

  Xine
  This seems like a promising program. It was originally designed to play MPEGs from DVDs. It can also play MPEG files on a hard drive and utilizes the Xv extensions for hardware YUV playback. It’s also supposed to play AVI files using the same technique as Avifile but I have never, ever gotten it to work. If an AVI file has both video and sound, the binary video decoder can’t decode any frames. If the AVI file has video and no sound, the program gets confused and crashes, as far as I can tell.

  Still, it’s promising, and I’ve been trying to work around these crashes. It doesn’t yet have the type of modularization I’d like to see. Right now, it tailored to suit MPEG playback and AVI playback is an afterthought. Still, it appears to have a generalized interface for dropping in new file demultiplexers.

  I tried to extend the program for supporting source decoders by rewriting w32codec.c from scratch. I’m not having a smooth time of it so far. I’m able to perform some manipulations on the output window. However, I can’t get the program to deal with an RGB image format. It has trouble allocating an RGB surface with XvShmCreateImage(). This isn’t suprising, per my limited knowledge of X which is that Xv applies to YUV images, but it could also apply to RGB images as well. Anyway, the program should be able to fall back on regular RGB pixmaps if that Xv call fails.

  Right now, this program is looking the most promising. It will take some work to extend the underlying infrastructure, but it seems doable since I know C quite well and can understand the flow of this program, as opposed to Avifile and its C++. The C code also compiles about 10 times faster.
  [My home project for many years after a brief flirtation with MPlayer. It is still alive ; its latest release was just a month ago.]

  XMovie
  This library is a Quicktime movie player. I haven’t looked at it too extensively yet, but I do remember looking at it at one point and reading the documentation that said it doesn’t support key frames. Still, I should examine it again since they released a new version recently.
  [Heroine Virtual still puts out some software but XMovie has not been updated since 2005.]

  XMPS
  This program compiles for me, but doesn’t do much else. It can play an MP3 file. I have been able to get MPEG movies to play through it, but it refuses to show the full video frame, constricting it to a small window (obviously a bug).
  [This project is hosted on SourceForge and is listed with a registration date of 2003, well after this survey was made. So the project obviously lived elsewhere in 2001. Meanwhile, it doesn’t look like any files ever made it to SF for hosting.]

  XTheater
  I can’t even get this program to compile. It’s supposed to be an MPEG player based on SMPEG. As such, it probably doesn’t hold much promise for being easily extended into a general media player.
  [Last updated in 2002.]

  GMerlin
  I can’t get this to compile yet. I have a bug report in to the dev group.
  [Updated consistently in the last 9 years. Last update was in February of this year. I can’t find any record of my bug report, though.]

• Can't compile C library with C++ code using g++

  13 novembre 2019, par shayst

  I’m trying to create a C++ program that embeds FFMPEG functionality.
  To do that I took one FFMPEG example and recompiled it as is using g++ (only adding extern "C" where needed).
  Compilation is successful, but linking fails for undefined symbols.

  cc -I/usr/include/x86_64-linux-gnu -Wall -g -fPIC  -c -o bin/decode_video.o decode_video.cpp
  
  
  
  cc -Wl,--export-dynamic,--no-undefined -L /usr/lib/x86_64-linux-gnu/ -shared -lavdevice -lavutil -lavcodec  bin/decode_video.o -o decode_video.so
  
  
  
  bin/decode_video.o: In function `decode(AVCodecContext*, AVFrame*, AVPacket*, char const*)':
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:60: undefined reference to `avcodec_send_packet'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:67: undefined reference to `avcodec_receive_frame'
  
  bin/decode_video.o: In function `main':
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:108: undefined reference to `av_packet_alloc'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:116: undefined reference to `avcodec_find_decoder'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:122: undefined reference to `av_parser_init'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:128: undefined reference to `avcodec_alloc_context3'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:139: undefined reference to `avcodec_open2'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:150: undefined reference to `av_frame_alloc'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:165: undefined reference to `av_parser_parse2'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:184: undefined reference to `av_parser_close'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:185: undefined reference to `avcodec_free_context'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:186: undefined reference to `av_frame_free'
  
  /home/admin1/ffmpeg_examples/decode_video.cpp:187: undefined reference to `av_packet_free'

  checking nm I see that there’s no name mangling in action so extern C seems to work well :

  nm bin/decode_video.o 
  
  
  
                   U avcodec_alloc_context3
  
                   U avcodec_find_decoder
  
                   U avcodec_free_context
  
                   U avcodec_open2
  
                   U avcodec_receive_frame
  
                   U avcodec_send_packet
  
                   U av_frame_alloc
  
                   U av_frame_free
  
                   U av_packet_alloc
  
                   U av_packet_free
  
                   U av_parser_close
  
                   U av_parser_init
  
                   U av_parser_parse2
  
                   U exit
  
                   U fclose
  
                   U feof
  
                   U fflush
  
                   U fopen
  
                   U fprintf
  
                   U fread
  
                   U fwrite
  
                   U _GLOBAL_OFFSET_TABLE_
  
  000000000000026f T main
  
                   U memset
  
                   U printf
  
                   U snprintf
  
                   U __stack_chk_fail
  
                   U stderr
  
                   U stdout
  
  00000000000000a3 t _ZL6decodeP14AVCodecContextP7AVFrameP8AVPacketPKc
  
  0000000000000000 t _ZL8pgm_savePhiiiPc

  checking the library, for one of the ’missing’ symbols, I can see it is implemented

  nm /usr/lib/x86_64-linux-gnu/libavcodec.a | grep avcodec_send_packet
  
  
  
  00000000000033e0 T avcodec_send_packet
  
                   U avcodec_send_packet

  When compiling in C it works perfectly (without extern C of course) which makes me wonder what am I missing ?

  Below find FFMPEG example code for reference (decode_video.cpp) :

  #include 
  
  #include 
  
  #include 
  
  
  
  extern "C"
  
  {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  }
  
  
  
  #define INBUF_SIZE 4096
  
  
  
  static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
  
                       char *filename)
  
  {
  
      FILE *f;
  
      int i;
  
  
  
      f = fopen(filename,"w");
  
      fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
  
      for (i = 0; i &lt; ysize; i++)
  
          fwrite(buf + i * wrap, 1, xsize, f);
  
      fclose(f);
  
  }
  
  
  
  static void decode(AVCodecContext *dec_ctx, AVFrame *frame, AVPacket *pkt,
  
                     const char *filename)
  
  {
  
      char buf[1024];
  
      int ret;
  
  
  
      ret = avcodec_send_packet(dec_ctx, pkt);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Error sending a packet for decoding\n");
  
          exit(1);
  
      }
  
  
  
      while (ret >= 0) {
  
          ret = avcodec_receive_frame(dec_ctx, frame);
  
          if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
  
              return;
  
          else if (ret &lt; 0) {
  
              fprintf(stderr, "Error during decoding\n");
  
              exit(1);
  
          }
  
  
  
          printf("saving frame %3d\n", dec_ctx->frame_number);
  
          fflush(stdout);
  
  
  
          /* the picture is allocated by the decoder. no need to
  
             free it */
  
          snprintf(buf, sizeof(buf), "%s-%d", filename, dec_ctx->frame_number);
  
          pgm_save(frame->data[0], frame->linesize[0],
  
                   frame->width, frame->height, buf);
  
      }
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
      const char *filename, *outfilename;
  
      const AVCodec *codec;
  
      AVCodecParserContext *parser;
  
      AVCodecContext *c= NULL;
  
      FILE *f;
  
      AVFrame *frame;
  
      uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
  
      uint8_t *data;
  
      size_t   data_size;
  
      int ret;
  
      AVPacket *pkt;
  
  
  
      if (argc &lt;= 2) {
  
          fprintf(stderr, "Usage: %s <input file="file" /> <output file="file">\n"
  
                  "And check your input file is encoded by mpeg1video please.\n", argv[0]);
  
          exit(0);
  
      }
  
      filename    = argv[1];
  
      outfilename = argv[2];
  
  
  
      pkt = av_packet_alloc();
  
      if (!pkt)
  
          exit(1);
  
  
  
      /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */
  
      memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
  
  
  
      /* find the MPEG-1 video decoder */
  
      codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
  
      if (!codec) {
  
          fprintf(stderr, "Codec not found\n");
  
          exit(1);
  
      }
  
  
  
      parser = av_parser_init(codec->id);
  
      if (!parser) {
  
          fprintf(stderr, "parser not found\n");
  
          exit(1);
  
      }
  
  
  
      c = avcodec_alloc_context3(codec);
  
      if (!c) {
  
          fprintf(stderr, "Could not allocate video codec context\n");
  
          exit(1);
  
      }
  
  
  
      /* For some codecs, such as msmpeg4 and mpeg4, width and height
  
         MUST be initialized there because this information is not
  
         available in the bitstream. */
  
  
  
      /* open it */
  
      if (avcodec_open2(c, codec, NULL) &lt; 0) {
  
          fprintf(stderr, "Could not open codec\n");
  
          exit(1);
  
      }
  
  
  
      f = fopen(filename, "rb");
  
      if (!f) {
  
          fprintf(stderr, "Could not open %s\n", filename);
  
          exit(1);
  
      }
  
  
  
      frame = av_frame_alloc();
  
      if (!frame) {
  
          fprintf(stderr, "Could not allocate video frame\n");
  
          exit(1);
  
      }
  
  
  
      while (!feof(f)) {
  
          /* read raw data from the input file */
  
          data_size = fread(inbuf, 1, INBUF_SIZE, f);
  
          if (!data_size)
  
              break;
  
  
  
          /* use the parser to split the data into frames */
  
          data = inbuf;
  
          while (data_size > 0) {
  
              ret = av_parser_parse2(parser, c, &amp;pkt->data, &amp;pkt->size,
  
                                     data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
  
              if (ret &lt; 0) {
  
                  fprintf(stderr, "Error while parsing\n");
  
                  exit(1);
  
              }
  
              data      += ret;
  
              data_size -= ret;
  
  
  
              if (pkt->size)
  
                  decode(c, frame, pkt, outfilename);
  
          }
  
      }
  
  
  
      /* flush the decoder */
  
      decode(c, frame, NULL, outfilename);
  
  
  
      fclose(f);
  
  
  
      av_parser_close(parser);
  
      avcodec_free_context(&amp;c);
  
      av_frame_free(&amp;frame);
  
      av_packet_free(&amp;pkt);
  
  
  
      return 0;
  
  }
  
  </output>