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• Cross-compiling for ffmpeg : libvpx decoder version must be >=0.9.1

  13 octobre 2016, par bot1131357

  (Note : I know the title is almost identical to this question, but its solution is only applicable if I were building on my own system. I am building for an embedded ARM device.)

  I am trying to build a cross-compile FFmpeg library to be targeted on an arm device, and the ./configure command tells me that libvpx is outdated.

  My version of libvpx is as follows :

  $ pkg-config --modversion vorbis 
  
  1.3.2

  When I run ./configure

  $ ./configure --prefix=/home/test/Dev/build-arm/ffmpeg-armhf/ --enable-cross-compile --cross-prefix=${CCPREFIX} --arch=armhf --target-os=linux --pkg-config-flags="--libs vpx --static --cflags" --enable-shared --enable-libvpx 
  
  ERROR: libvpx decoder version must be >=0.9.1
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.

  My vpx.pc file is located in /usr/share/pkgconfig. Since it’s for a different target (arm), Should I be putting this file somewhere else ? :

  # pkg-config file from libvpx v1.6.0-322-gc325fb7
  
  prefix=/home/test/Dev/build-arm/libvpx
  
  exec_prefix=${prefix}
  
  libdir=${prefix}/lib
  
  includedir=${prefix}/include
  
  
  
  Name: vpx
  
  Description: WebM Project VPx codec implementation
  
  Version: 1.6.0
  
  Requires:
  
  Conflicts:
  
  Libs: -L${libdir} -lvpx -lm
  
  Libs.private: -lm -lpthread
  
  Cflags: -I${includedir}

  In my config.log I see this :

  (...lots of text...)
  
  arm-openwrt-linux-gnueabi-gcc -Werror=missing-prototypes -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -march=armv7-a -std=c99 -fomit-frame-pointer -marm -fPIC -pthread -c -o /tmp/ffconf.cZcBLWc3.o /tmp/ffconf.sWjTIULb.m
  
  arm-openwrt-linux-gnueabi-gcc: /tmp/ffconf.sWjTIULb.m: Objective-C compiler not installed on this system
  
  check_pkg_config vpx >= 0.9.1 vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_vp8_dx
  
  false --exists --print-errors vpx >= 0.9.1
  
  check_lib2 vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_dec_init_ver -lvpx
  
  check_func_headers vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_dec_init_ver -lvpx
  
  check_ld cc -lvpx
  
  check_cc
  
  BEGIN /tmp/ffconf.gM9G9FSQ.c
  
      1   #include <vpx></vpx>vpx_decoder.h>
  
      2   #include <vpx></vpx>vp8dx.h>
  
      3   long check_vpx_codec_dec_init_ver(void) { return (long) vpx_codec_dec_init_ver; }
  
      4   int main(void) { return 0; }
  
  END /tmp/ffconf.gM9G9FSQ.c
  
  arm-openwrt-linux-gnueabi-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -march=armv7-a -std=c99 -fomit-frame-pointer -marm -fPIC -pthread -c -o /tmp/ffconf.cZcBLWc3.o /tmp/ffconf.gM9G9FSQ.c
  
  /tmp/ffconf.gM9G9FSQ.c:1:29: fatal error: vpx/vpx_decoder.h: No such file or directory
  
  compilation terminated.
  
  ERROR: libvpx decoder version must be >=0.9.1

  It looks like the include and library paths are not provided to the compiler, but I don’t know how I should go around solving that.
  I would really appreciate it if you could offer some guidance.

• Connection reset by peer, ffmpeg

  18 août 2016, par Johnnylin

  I have tried several ways and done a lot of search. I just cannot figure out why this happens.

  This is the thread. I did almost the same thing.

  https://ffmpeg.org/pipermail/libav-user/2014-March/006356.html

  When you use ffmpeg command line together with ffserver, it works. But when you use sample code. It just does not work.

  What is missing ?

  EDIT

  Hi all,

  I took the muxing.c example and modified it in order to send a stream
  through a network socket. I only made few modifications :

  main function now looks like :

  int main()
  
  {
  
      AVOutputFormat *fmt;
  
      AVFormatContext *oc;
  
      AVStream *audio_st, *video_st;
  
      AVCodec *audio_codec, *video_codec;
  
      double audio_time, video_time;
  
      int flush, ret;
  
  
  
      /* Initialize libavcodec, and register all codecs and formats. */
  
      av_register_all();
  
      avformat_network_init();
  
  
  
      /* allocate the output media context */
  
      avformat_alloc_output_context2(&oc, NULL, "mpegts", NULL);
  
      if (!oc) {
  
          printf("Could not deduce output format from file extension: using
  
  MPEG.\n");
  
          avformat_alloc_output_context2(&oc, NULL, "mpegts", NULL);
  
      }
  
      if (!oc)
  
          return 1;
  
  
  
      fmt = oc->oformat;
  
      //fmt->video_codec = AV_CODEC_ID_MPEG2VIDEO;
  
      //fmt->audio_codec = AV_CODEC_ID_MP3;
  
  
  
      /* Add the audio and video streams using the default format codecs
  
       * and initialize the codecs. */
  
      video_st = NULL;
  
      audio_st = NULL;
  
  
  
      if (fmt->video_codec != AV_CODEC_ID_NONE)
  
          video_st = add_stream(oc, &video_codec, fmt->video_codec);
  
      if (fmt->audio_codec != AV_CODEC_ID_NONE)
  
          audio_st = add_stream(oc, &audio_codec, fmt->audio_codec);
  
  
  
      /* Now that all the parameters are set, we can open the audio and
  
       * video codecs and allocate the necessary encode buffers. */
  
      if (video_st)
  
          open_video(oc, video_codec, video_st);
  
      if (audio_st)
  
          open_audio(oc, audio_codec, audio_st);
  
  
  
     av_dump_format(oc, 0, "http://localhost:8090/feed1.ffm", 1);
  
  
  
      /* open the output file, if needed */
  
      if (!(fmt->flags & AVFMT_NOFILE)) {
  
          ret = avio_open(&oc->pb, "http://localhost:8090/feed1.ffm",
  
  AVIO_FLAG_WRITE);
  
          if (ret < 0) {
  
              fprintf(stderr, "Could not open '%s': %s\n", "
  
  http://localhost:8090/feed1.ffm",
  
                      av_err2str(ret));
  
              return 1;
  
          }
  
      }
  
  
  
      /* Write the stream header, if any. */
  
      ret = avformat_write_header(oc, NULL);
  
      if (ret < 0) {
  
          fprintf(stderr, "Error occurred when opening output file: %s\n",
  
                  av_err2str(ret));
  
          return 1;
  
      }
  
  
  
      flush = 0;
  
      while ((video_st && !video_is_eof) || (audio_st && !audio_is_eof)) {
  
          /* Compute current audio and video time. */
  
          audio_time = (audio_st && !audio_is_eof) ? audio_st->pts.val *
  
  av_q2d(audio_st->time_base) : INFINITY;
  
          video_time = (video_st && !video_is_eof) ? video_st->pts.val *
  
  av_q2d(video_st->time_base) : INFINITY;
  
  
  
          if (!flush &&
  
              (!audio_st || audio_time >= STREAM_DURATION) &&
  
              (!video_st || video_time >= STREAM_DURATION)) {
  
              flush = 1;
  
          }
  
  
  
          /* write interleaved audio and video frames */
  
          if (audio_st && !audio_is_eof && audio_time <= video_time) {
  
              write_audio_frame(oc, audio_st, flush);
  
          } else if (video_st && !video_is_eof && video_time < audio_time) {
  
              write_video_frame(oc, video_st, flush);
  
          }
  
      }
  
  
  
      /* Write the trailer, if any. The trailer must be written before you
  
       * close the CodecContexts open when you wrote the header; otherwise
  
       * av_write_trailer() may try to use memory that was freed on
  
       * av_codec_close(). */
  
      av_write_trailer(oc);
  
  
  
      /* Close each codec. */
  
      if (video_st)
  
          close_video(oc, video_st);
  
      if (audio_st)
  
          close_audio(oc, audio_st);
  
  
  
      if (!(fmt->flags & AVFMT_NOFILE))
  
          /* Close the output file. */
  
          avio_close(oc->pb);
  
  
  
      /* free the stream */
  
      avformat_free_context(oc);
  
  
  
      return 0;
  
  }  

  and, in order to avoid a warning about channel layout not specified, I
  added :

  c->channel_layout = av_get_default_channel_layout(c->channels);
  
  
  
  in function AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,
  
                          enum AVCodecID codec_id)

  just under the row c->channels = 2 ;

  I also raised a ffserver with the following configuration (showing only
  feed lines) :

  <feed>
  
          File /tmp/feed1.ffm
  
          FileMaxSize 1GB
  
          ACL allow 127.0.0.1
  
          ACL allow 192.168.0.0 192.168.255.255
  
  </feed>

  ffserver is working fine if I feed it with a ffmpeg commandline, e.g :

  ffmpeg -r 25 -i movie.mp4 -acodec libfdk_aac  -ab 128k -vcodec libx264 -fpre libx264-fast.ffpreset http://localhost:8090/feed1.ffm

  But with my example, I can write only few frames and after that may muxing
  modified program ends with :

  Error while writing video frame : Connection reset by peer

  I tried also different codecs (h264) and format (flv), turning out in a
  different number of frames written, but eventually I got the same error
  above.

  ffserver do not reports errors at all, only write:
  
  Tue Mar  4 12:55:10 2014 127.0.0.1 - - [POST] "/feed1.ffm HTTP/1.1" 200 4096
  
  confirming that the communication socket was open

  What am i missing ??

  Thanks

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