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• ffmpeg filter dev get_video_buffer function usage

  19 juin 2018, par Michael.Ma

  I’m writing a mosaic ffmpeg filter.
  copy code from vf_vflip.c, I register a callback function get_video_buffer
  and implement it as follows :

  static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
  
  {
  
      MosaicContext *s = link->dst->priv;
  
      AVFrame *frame;
  
      int i;
  
      int j,k;
  
  
  
      frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
  
      if (!frame)
  
          return NULL;
  
  
  
      if (s->w == 0 || s->h == 0)
  
          return frame;
  
  
  
      for (i = 0; i < 3; i ++) {
  
          // some trick code
  
      }
  
  
  
      return frame;
  
  }
  
  
  
  static const AVFilterPad avfilter_vf_mosaic_inputs[] = {
  
      {
  
          .name             = "default",
  
          .type             = AVMEDIA_TYPE_VIDEO,
  
          //.get_video_buffer = get_video_buffer,
  
          .filter_frame     = filter_frame,
  
          .config_props     = config_input,
  
      },
  
      { NULL }
  
  };

  But after read some filter dev guide, I found that only a few filter implement get_video_buffer funcition.The default function is f_default_get_video_buffer()
  I make some log find that ffmpeg call function like

  get_video_buffer
  
  filter_frame
  
  get_video_buffer
  
  filter_frame
  
  get_video_buffer
  
  filter_frame
  
  ...

  I’m confused about get_video_buffer do what job.
  Only know that some filter will hold frame cache.
  Can I juse comment out the get_video_buffer hook ?

  I see flip job both in get_video_buffer() and filter_frame() in vf_vflip.c
  Is it a waste of time ?

  static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
  
  {
  
      FlipContext *flip = link->dst->priv;
  
      AVFrame *frame;
  
      int i;
  
  
  
      frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
  
      if (!frame)
  
          return NULL;
  
  
  
      for (i = 0; i < 4; i ++) {
  
          int vsub = i == 1 || i == 2 ? flip->vsub : 0;
  
          int height = AV_CEIL_RSHIFT(h, vsub);
  
  
  
          if (frame->data[i]) {
  
              frame->data[i] += (height - 1) * frame->linesize[i];
  
              frame->linesize[i] = -frame->linesize[i];
  
          }
  
      }
  
  
  
      return frame;
  
  }
  
  
  
  static int filter_frame(AVFilterLink *link, AVFrame *frame)
  
  {
  
      FlipContext *flip = link->dst->priv;
  
      int i;
  
  
  
      for (i = 0; i < 4; i ++) {
  
          int vsub = i == 1 || i == 2 ? flip->vsub : 0;
  
          int height = AV_CEIL_RSHIFT(link->h, vsub);
  
  
  
          if (frame->data[i]) {
  
              frame->data[i] += (height - 1) * frame->linesize[i];
  
              frame->linesize[i] = -frame->linesize[i];
  
          }
  
      }
  
  
  
      return ff_filter_frame(link->dst->outputs[0], frame);
  
  }

• Error : mingw32/bin/ld.exe : cannot find -lavformat when compiling goav

  18 avril 2018, par nevernew

  I’m trying to compile goav on Windows and I’ve got quite far I’ve compiled the ffmpeg libraries in MSYS2 and linked the packages with :

  set CGO_CFLAGS=-IC:\path\to\FFmpeg\
  
  set PKG_CONFIG_PATH=%~dp0FFmpeg\libavformat;%~dp0FFmpeg\libavcodec;%~dp0FFmpeg\libavutil;%~dp0FFmpeg\libswresample;

  which has worked !

  However, I’m now getting the error could not determine kind of name for ...

  Here’s the whole error list :

  # github.com/giorgisio/goav/avcodec
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:57:52: could not determine kind of name for C.AV_CODEC_ID_ADPCM_VIMA_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:93:52: could not determine kind of name for C.AV_CODEC_ID_BRENDER_PIX_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:131:52: could not determine kind of name for C.AV_CODEC_ID_ESCAPE130_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:134:52: could not determine kind of name for C.AV_CODEC_ID_EXR_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:151:52: could not determine kind of name for C.AV_CODEC_ID_G2M_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:164:52: could not determine kind of name for C.AV_CODEC_ID_HEVC_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:211:52: could not determine kind of name for C.AV_CODEC_ID_MPEG2VIDEO_XVMC
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:228:52: could not determine kind of name for C.AV_CODEC_ID_MVC1_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:230:52: could not determine kind of name for C.AV_CODEC_ID_MVC2_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:237:52: could not determine kind of name for C.AV_CODEC_ID_OPUS_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:240:52: could not determine kind of name for C.AV_CODEC_ID_PAF_AUDIO_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:242:52: could not determine kind of name for C.AV_CODEC_ID_PAF_VIDEO_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:262:52: could not determine kind of name for C.AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:266:52: could not determine kind of name for C.AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:311:52: could not determine kind of name for C.AV_CODEC_ID_SANM_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:314:52: could not determine kind of name for C.AV_CODEC_ID_SGIRLE_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:338:52: could not determine kind of name for C.AV_CODEC_ID_TAK_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:373:52: could not determine kind of name for C.AV_CODEC_ID_VIMA
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:379:52: could not determine kind of name for C.AV_CODEC_ID_VOXWARE
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:386:52: could not determine kind of name for C.AV_CODEC_ID_VP7_DEPRECATED
  
  source\src\github.com\giorgisio\goav\avcodec\codecs.go:392:52: could not determine kind of name for C.AV_CODEC_ID_WEBP_DEPRECATED
  
  compilation failed.
  
  exit code 2

  How can I fix this so it can finish compiling ?

  More Errors :

  I commented out those lines in the source file to see if I could continue, but now I’m getting all these errors, Obviously I’m missing some step, does anyone have any insight ?

  # github.com/giorgisio/goav/avcodec
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lavformat
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lbz2
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lavcodec
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lz
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lswresample
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lavutil
  
  c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lbcrypt
  
  collect2.exe: error: ld returned 1 exit status
  
  # github.com/giorgisio/goav/avcodec
  
  cgo-gcc-prolog: In function '_cgo_3a37b7d41a30_Cfunc_av_codec_get_max_lowres':
  
  cgo-gcc-prolog:40:2: warning: 'av_codec_get_max_lowres' is deprecated [-Wdeprecated-declarations]
  
  In file included from C:\Users\chris\Documents\videoplayer\FFmpeg/libavformat/avformat.h:319:0,
  
                   from source\src\github.com\giorgisio\goav\avcodec\avcodec.go:14:
  
  C:\Users\chris\Documents\videoplayer\FFmpeg/libavcodec/avcodec.h:3554:5: note: declared here
  
   int av_codec_get_max_lowres(const AVCodec *codec);
  
       ^~~~~~~~~~~~~~~~~~~~~~~
  
  cgo-gcc-prolog: In function '_cgo_3a37b7d41a30_Cfunc_av_codec_next':
  
  cgo-gcc-prolog:91:2: warning: 'av_codec_next' is deprecated [-Wdeprecated-declarations]
  
  In file included from C:\Users\chris\Documents\videoplayer\FFmpeg/libavformat/avformat.h:319:0,
  
                   from source\src\github.com\giorgisio\goav\avcodec\avcodec.go:14:
  
  C:\Users\chris\Documents\videoplayer\FFmpeg/libavcodec/avcodec.h:4045:10: note: declared here
  
   AVCodec *av_codec_next(const AVCodec *c);
  
  ....

• Ffmpeg returning error code 1 in AWS Lamda function

  14 avril 2018, par Tometoyou

  I’m running a lambda function which takes an mp4 video, and adds a watermark of a png image over the top of it in the bottom right hand corner (with a 10px margin). It then outputs that image to a temporary location. It keeps failing with Error code 1, but that isn’t very helpful. I’m using a binary version of ffmpeg that is specified in the main directory of the code. I know that ffmpeg is set up correctly due to using it in another lambda function in this way, which works. But adding an overlay fails. Here is the relevant part of my code :

  function addWatermark(next) {
  
      var ffmpeg = child_process.spawn("ffmpeg", [
  
        "-i", target, // url to stream from
  
        "-i", watermarkPath,
  
        "-filter_complex" ,"overlay=x=W-w-10:y=H-h-10:format=rgb,format=yuv420p",
  
        "-c:a", "copy",
  
        "pipe:1"
  
      ]);
  
      ffmpeg.on("error", function(err) {
  
        console.log(err);
  
      })
  
      ffmpeg.on("close", function(code) {
  
        if (code != 0 ) {
  
          console.log("child process exited with code " + code); // Always exits here.
  
        } else {
  
          console.log("Processing finished !");
  
        }
  
        tmpFile.end(); 
  
        next(code);
  
      });
  
      tmpFile.on("error", function(err) {
  
        console.log("stream err: ", err);
  
      });
  
      ffmpeg.on("end", function() {
  
        tmpFile.end();  
  
      })
  
      ffmpeg.stdout.pipe(tmpFile)
  
      .on("error", function(err){
  
        console.log("error while writing: ",err);
  
      });
  
  }

  Can anyone spot what may be wrong ?

  UPDATE

  I’ve managed to print out some more logs, I’m getting the error :

  [NULL @ 0x42923e0] Unable to find a suitable output format for 'pipe:1'