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• simple ffmpeg API example for converting multiple input images into 1 image using tile filter

  9 août 2014, par Pragnesh Patel

  here is my code.....................
  
  
  
  
  
  AVFilterContext **inputContexts;
  
  AVFilterContext *outputContext;
  
  AVFilterGraph *graph;
  
  
  
  int initFilters(AVFrame *bgFrame, int inputCount, AVCodecContext **codecContexts, char       *filters)
  
  {
  
        int i;
  
    int returnCode;
  
     char args[512];
  
  char name[9];
  
  AVFilterInOut **graphInputs = NULL;
  
  AVFilterInOut *graphOutput = NULL;
  
  
  
  AVFilter *bufferSrc  = avfilter_get_by_name("buffer");
  
  AVFilter *bufferSink = avfilter_get_by_name("buffersink");
  
  
  
  graph = avfilter_graph_alloc();
  
  if(graph == NULL)
  
      return -1;
  
  
  
  //allocate inputs
  
  graphInputs = av_calloc(inputCount + 1, sizeof(AVFilterInOut *));
  
  for(i = 0; i <= inputCount; i++)
  
  {
  
      graphInputs[i] = avfilter_inout_alloc();
  
      if(graphInputs[i] == NULL)
  
          return -1;
  
  }
  
  
  
  //allocate input contexts
  
  inputContexts = av_calloc(inputCount + 1, sizeof(AVFilterContext *));
  
  //first is the background
  
  snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=1/1:pixel_aspect=0",   bgFrame->width, bgFrame->height, bgFrame->format);
  
  returnCode = avfilter_graph_create_filter(&inputContexts[0], bufferSrc, "background",  args, NULL, graph);
  
  if(returnCode < 0)
  
      return returnCode;
  
  graphInputs[0]->filter_ctx = inputContexts[0];
  
  graphInputs[0]->name = av_strdup("background");
  
  graphInputs[0]->next = graphInputs[1];
  
  
  
  //allocate the rest
  
  for(i = 1; i <= inputCount; i++)
  
  {
  
      AVCodecContext *codecCtx = codecContexts[i - 1];
  
      snprintf(args, sizeof(args),    "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
  
                  codecCtx->width, codecCtx->height, codecCtx->pix_fmt,
  
                  codecCtx->time_base.num, codecCtx->time_base.den,
  
                  codecCtx->sample_aspect_ratio.num, codecCtx->sample_aspect_ratio.den);
  
      snprintf(name, sizeof(name), "video_%d", i);
  
  
  
      returnCode = avfilter_graph_create_filter(&inputContexts[i], bufferSrc, name, args, NULL, graph);
  
      if(returnCode < 0)
  
          return returnCode;
  
  
  
      graphInputs[i]->filter_ctx = inputContexts[i];
  
      graphInputs[i]->name = av_strdup(name);
  
      graphInputs[i]->pad_idx = 0;
  
      if(i < inputCount)
  
      {
  
          graphInputs[i]->next = graphInputs[i + 1];
  
      }
  
      else
  
      {
  
          graphInputs[i]->next = NULL;
  
      }
  
  }
  
  
  
  //allocate outputs
  
  graphOutput = avfilter_inout_alloc();   
  
  returnCode = avfilter_graph_create_filter(&outputContext, bufferSink, "out", NULL, NULL, graph);
  
  if(returnCode < 0)
  
      return returnCode;
  
  graphOutput->filter_ctx = outputContext;
  
  graphOutput->name = av_strdup("out");
  
  graphOutput->next = NULL;
  
  graphOutput->pad_idx = 0;
  
  
  
  returnCode = avfilter_graph_parse_ptr(graph, filters, graphInputs, &graphOutput, NULL);
  
  if(returnCode < 0)
  
      return returnCode;
  
  
  
  returnCode = avfilter_graph_config(graph, NULL);
  
      return returnCode;
  
  
  
  return 0;
  
  }

  The filters argument of the function is passed on to avfilter_graph_parse_ptr and it can looks like this : [background] scale=512x512 [base] ; [video_1] scale=256x256 [tmp_1] ; [base][tmp_1] tile=1x2 [out]

  The call breaks after the call to avfilter_graph_config with the warning : Output pad "default" with type video of the filter instance "background" of buffer not connected to any destination and the error Invalid argument.

  please help me

  thanks in advance.................

• ffmpeg how to add mkv to formats

  30 décembre 2015, par Mahmoud Saad

  hello after installing ffmpeg in my linux server with centos 6 after searching google i run ffmpeg -formats so i need to add mkv i know i will need to recompile ffmpeg but i do not know how to do it
  thank you

  File formats:
  
   D. = Demuxing supported
  
   .E = Muxing supported
  
   --
  
    E 3g2             3GP2 format
  
    E 3gp             3GP format
  
   D  4xm             4X Technologies format
  
   D  IFF             IFF format
  
   D  ISS             Funcom ISS format
  
   D  MTV             MTV format
  
   DE RoQ             raw id RoQ format
  
   D  aac             raw ADTS AAC
  
   DE ac3             raw AC-3
  
    E adts            ADTS AAC
  
   D  aea             MD STUDIO audio
  
   DE aiff            Audio IFF
  
   DE alaw            PCM A-law format
  
   DE alsa            ALSA audio output
  
   DE amr             3GPP AMR file format
  
   D  anm             Deluxe Paint Animation
  
   D  apc             CRYO APC format
  
   D  ape             Monkey's Audio
  
   DE asf             ASF format
  
    E asf_stream      ASF format
  
   DE ass             SSA/ASS format
  
   DE au              SUN AU format
  
   DE avi             AVI format
  
    E avm2            Flash 9 (AVM2) format
  
   D  avs             AVS format
  
   D  bethsoftvid     Bethesda Softworks VID format
  
   D  bfi             Brute Force & Ignorance
  
   D  bink            Bink
  
   D  c93             Interplay C93
  
   D  caf             Apple Core Audio Format
  
   D  cavsvideo       raw Chinese AVS video
  
   D  cdg             CD Graphics Format
  
    E crc             CRC testing format
  
   DE daud            D-Cinema audio format
  
   DE dirac           raw Dirac
  
   DE dnxhd           raw DNxHD (SMPTE VC-3)
  
   D  dsicin          Delphine Software International CIN format
  
   DE dts             raw DTS
  
   DE dv              DV video format
  
   D  dv1394          DV1394 A/V grab
  
    E dvd             MPEG-2 PS format (DVD VOB)
  
   D  dxa             DXA
  
   D  ea              Electronic Arts Multimedia Format
  
   D  ea_cdata        Electronic Arts cdata
  
   DE eac3            raw E-AC-3
  
   DE f32be           PCM 32 bit floating-point big-endian format
  
   DE f32le           PCM 32 bit floating-point little-endian format
  
   DE f64be           PCM 64 bit floating-point big-endian format
  
   DE f64le           PCM 64 bit floating-point little-endian format
  
   DE ffm             FFM (FFserver live feed) format
  
   D  film_cpk        Sega FILM/CPK format
  
   DE filmstrip       Adobe Filmstrip
  
   DE flac            raw FLAC
  
   D  flic            FLI/FLC/FLX animation format
  
   DE flv             FLV format
  
    E framecrc        framecrc testing format
  
    E gif             GIF Animation
  
   D  gsm             raw GSM
  
   DE gxf             GXF format
  
   DE h261            raw H.261
  
   DE h263            raw H.263
  
   DE h264            raw H.264 video format
  
   D  idcin           id Cinematic format
  
   DE image2          image2 sequence
  
   DE image2pipe      piped image2 sequence
  
   D  ingenient       raw Ingenient MJPEG
  
   D  ipmovie         Interplay MVE format
  
    E ipod            iPod H.264 MP4 format
  
   D  iv8             A format generated by IndigoVision 8000 video server
  
   D  libdc1394       dc1394 v.2 A/V grab
  
   D  lmlm4           lmlm4 raw format
  
   DE m4v             raw MPEG-4 video format
  
   DE matroska        Matroska file format
  
   DE mjpeg           raw MJPEG video
  
   DE mlp             raw MLP
  
   D  mm              American Laser Games MM format
  
   DE mmf             Yamaha SMAF
  
    E mov             MOV format
  
   D  mov,mp4,m4a,3gp,3g2,mj2 QuickTime/MPEG-4/Motion JPEG 2000 format
  
    E mp2             MPEG audio layer 2
  
   DE mp3             MPEG audio layer 3
  
    E mp4             MP4 format
  
   D  mpc             Musepack
  
   D  mpc8            Musepack SV8
  
   DE mpeg            MPEG-1 System format
  
    E mpeg1video      raw MPEG-1 video
  
    E mpeg2video      raw MPEG-2 video
  
   DE mpegts          MPEG-2 transport stream format
  
   D  mpegtsraw       MPEG-2 raw transport stream format
  
   D  mpegvideo       raw MPEG video
  
    E mpjpeg          MIME multipart JPEG format
  
   D  msnwctcp        MSN TCP Webcam stream
  
   DE mulaw           PCM mu-law format
  
   D  mvi             Motion Pixels MVI format
  
   DE mxf             Material eXchange Format
  
    E mxf_d10         Material eXchange Format, D-10 Mapping
  
   D  nc              NC camera feed format
  
   D  nsv             Nullsoft Streaming Video
  
    E null            raw null video format
  
   DE nut             NUT format
  
   D  nuv             NuppelVideo format
  
   DE ogg             Ogg
  
   D  oma             Sony OpenMG audio
  
   DE oss             Open Sound System playback
  
    E psp             PSP MP4 format
  
   D  psxstr          Sony Playstation STR format
  
   D  pva             TechnoTrend PVA file and stream format
  
   D  qcp             QCP format
  
   D  r3d             REDCODE R3D format
  
   DE rawvideo        raw video format
  
    E rcv             VC-1 test bitstream
  
   D  rl2             RL2 format
  
   DE rm              RealMedia format
  
   D  rpl             RPL/ARMovie format
  
    E rtp             RTP output format
  
   DE rtsp            RTSP output format
  
   DE s16be           PCM signed 16 bit big-endian format
  
   DE s16le           PCM signed 16 bit little-endian format
  
   DE s24be           PCM signed 24 bit big-endian format
  
   DE s24le           PCM signed 24 bit little-endian format
  
   DE s32be           PCM signed 32 bit big-endian format
  
   DE s32le           PCM signed 32 bit little-endian format
  
   DE s8              PCM signed 8 bit format
  
   D  sdp             SDP
  
   D  shn             raw Shorten
  
   D  siff            Beam Software SIFF
  
   D  smk             Smacker video
  
   D  sol             Sierra SOL format
  
   DE sox             SoX native format
  
    E spdif           IEC958 - S/PDIF (IEC-61937)
  
    E svcd            MPEG-2 PS format (VOB)
  
   DE swf             Flash format
  
   D  thp             THP
  
   D  tiertexseq      Tiertex Limited SEQ format
  
   D  tmv             8088flex TMV
  
   DE truehd          raw TrueHD
  
   D  tta             True Audio
  
   D  txd             Renderware TeXture Dictionary
  
   DE u16be           PCM unsigned 16 bit big-endian format
  
   DE u16le           PCM unsigned 16 bit little-endian format
  
   DE u24be           PCM unsigned 24 bit big-endian format
  
   DE u24le           PCM unsigned 24 bit little-endian format
  
   DE u32be           PCM unsigned 32 bit big-endian format
  
   DE u32le           PCM unsigned 32 bit little-endian format
  
   DE u8              PCM unsigned 8 bit format
  
   D  vc1             raw VC-1
  
   D  vc1test         VC-1 test bitstream format
  
    E vcd             MPEG-1 System format (VCD)
  
   D  video4linux     Video4Linux device grab
  
   D  video4linux2    Video4Linux2 device grab
  
   D  vmd             Sierra VMD format
  
    E vob             MPEG-2 PS format (VOB)
  
   DE voc             Creative Voice file format
  
   D  vqf             Nippon Telegraph and Telephone Corporation (NTT) TwinVQ
  
   D  w64             Sony Wave64 format
  
   DE wav             WAV format
  
   D  wc3movie        Wing Commander III movie format
  
    E webm            WebM file format
  
   D  wsaud           Westwood Studios audio format
  
   D  wsvqa           Westwood Studios VQA format
  
   D  wv              WavPack
  
   D  x11grab         X11grab
  
   D  xa              Maxis XA File Format
  
   D  yop             Psygnosis YOP Format
  
   DE yuv4mpegpipe    YUV4MPEG pipe format

• Salty Game Music

  31 mai 2011, par Multimedia Mike — General

  Have you heard of Google’s Native Client (NaCl) project ? Probably not. Basically, it allows native code modules to run inside a browser (where ‘browser’ is defined pretty narrowly as ‘Google Chrome’ in this case). Programs are sandboxed so they aren’t a security menace (or so the whitepapers claim) but are allowed to access a variety of APIs including video and audio. The latter API is significant because sound tends to be forgotten in all the hullabaloo surrounding non-Flash web technologies. At any rate, enjoy NaCl while you can because I suspect it won’t be around much longer.

  After my recent work upgrading some old music synthesis programs to user more modern audio APIs, I got the idea to try porting the same code to run under NaCl in Chrome (first Nosefart, then Game Music Emu/GME). In this exercise, I met with very limited success. This blog post documents some of the pitfalls in my excursion.

  
  
  

  Infrastructure
  People who know me know that I’m rather partial — to put it gently — to straight-up C vs. C++. The NaCl SDK is heavily skewed towards C++. However, it does provide a Python tool called init_project.py which can create the skeleton of a project and can do so in C with the '-c' option :

  ./init_project.py -c -n saltynosefart
  

  This generates something that can be built using a simple ‘make’. When I added Nosefart’s C files, I learned that the project Makefile has places for project-necessary CFLAGS but does not honor them. The problem is that the generated Makefile includes a broader system Makefile that overrides the CFLAGS in the project Makefile. Going into the system Makefile and changing "CFLAGS =" -> "CFLAGS +=" solves this problem.

  Still, maybe I’m the first person to attempt building something in Native Client so I’m the first person to notice this ?

  Basic Playback
  At least the process to create an audio-enabled NaCl app is well-documented. Too bad it doesn’t seem to compile as advertised. According to my notes on the matter, I filled in PPP_InitializeModule() with the appropriate boilerplate as outlined in the docs but got a linker error concerning get_browser_interface().

  Plan B : C++
  Obviously, the straight C stuff is very much a second-class citizen in this NaCl setup. Fortunately, there is already that fully functional tone generator example program in the limited samples suite. Plan B is to copy that project and edit it until it accepts Nosefart/GME audio instead of a sine wave.

  The build system assumes all C++ files should have .cc extensions. I have to make some fixes so that it will accept .cpp files (either that, or rename all .cpp to .cc, but that’s not very clean).

  Making Noise
  You’ll be happy to know that I did successfully swap out the tone generator for either Nosefart or GME. Nosefart has a slightly fickle API that requires revving the emulator frame by frame and generating a certain number of audio samples. GME’s API is much easier to work with in this situation — just tell it how many samples it needs to generate and give it a pointer to a buffer. I played NES and SNES music play through this ad-hoc browser plugin, and I’m confident all the other supported formats would have worked if I went through the bother of converting the music data files into C headers to be included in the NaCl executable binaries (dynamically loading data via the network promised to be a far more challenging prospect reserved for phase 3 of the project).

  Portable ?
  I wouldn’t say so. I developed it on Linux and things ran fine there. I tried to run the same binaries on the Windows version of Chrome to no avail. It looks like it wasn’t even loading the .nexe files (NaCl executables).

  Thinking About The (Lack Of A) Future
  As I was working on this project, I noticed that the online NaCl documentation materialized explicit banners warning that my NaCl binaries compiled for Chrome 11 won’t work for Chrome 12 and that I need to code to the newly-released 0.3 SDK version. Not a fuzzy feeling. I also don’t feel good that I’m working from examples using bleeding edge APIs that feature deprecation as part of their naming convention, e.g., pp::deprecated::ScriptableObject().

  Ever-changing API + minimal API documentation + API that only works in one browser brand + requiring end user to explicitly enable feature = … well, that’s why I didn’t bother to release any showcase pertaining to this little experiment. Would have been neat, but I strongly suspect that this is yet another one of those APIs that Google decides to deprecate soon.

  See Also :

  • I eventually got a second wind and made this work using the C interface.