Recherche avancée

Sur d’autres sites (5694)

• Errors in compiling FFmpeg for windows10/aarch64 using Microsoft Visual Studio 2017 Preview edition

  29 octobre 2018, par Narsinga

  I am trying to compile FFmpeg (the Chromium version) for Windows10/Aarch64 configuration using Microsoft Visual Studio 2017 Preview community edition. I am running into errors in the assembly files as copied below (highlighted few errors). I believe FFmpeg is working for Linux/Aarch64 configuration (probably using GNU assembler) already in which case the same assembly code should also work for Microsoft ARM Macro Assembler as well. Please let me know if I am missing anything here and any pointers to help resolve the errors.

  D :\Work\Chromium_FFmpeg\chromium\src>ninja -C out\ARM64V8 third_party\ffmpeg
  ninja : Entering directory `out\ARM64V8’
  [2/9] ASM obj/third_party/ffmpeg/ffmpeg_internal/autorename_libavcodec_aarch64_fft_neon.obj
  FAILED : obj/third_party/ffmpeg/ffmpeg_internal/autorename_libavcodec_aarch64_fft_neon.obj
  D :/Work/Chromium_FFmpeg/depot_tools/win_tools-2_7_6_bin/python/bin/python.exe ../../build/toolchain/win/tool_wrapper.py asm-wrapper environment.arm64 armasm64.exe /Foobj/third_party/ffmpeg/ffmpeg_internal/autorename_libavcodec_aarch64_fft_neon.obj ../../third_party/ffmpeg/libavcodec/aarch64/autorename_libavcodec_aarch64_fft_neon.S
  Microsoft (R) ARM Macro Assembler Version 14.16.26926.0 for 64 bits
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\autorename_libavcodec_aarch64_fft_neon.S(1) : error A2003 : improper line syntax : /
  // File automatically generated. See crbug.com/495833.
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\autorename_libavcodec_aarch64_fft_neon.S(2) : error A2230 : Illegal preprocessor directive ; only "#line [filename]" is recognized
  include "fft_neon.S"
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\autorename_libavcodec_aarch64_fft_neon.S(3) : warning A4045 : missing END directive
  include "fft_neon.S"
  .
  .
  .
  [6/9] ASM obj/third_party/ffmpeg/ffmpeg_internal/mpegaudiodsp_neon.obj
  FAILED : obj/third_party/ffmpeg/ffmpeg_internal/mpegaudiodsp_neon.obj
  D :/Work/Chromium_FFmpeg/depot_tools/win_tools-2_7_6_bin/python/bin/python.exe ../../build/toolchain/win/tool_wrapper.py asm-wrapper environment.arm64 armasm64.exe /Foobj/third_party/ffmpeg/ffmpeg_internal/mpegaudiodsp_neon.obj ../../third_party/ffmpeg/libavcodec/aarch64/mpegaudiodsp_neon.S
  Microsoft (R) ARM Macro Assembler Version 14.16.26926.0 for 64 bits
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(1) : error A2003 : improper line syntax : /
  /*
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(2) : error A2079 : improper line syntax ; symbol expected
  * Copyright (c) 2014 Janne Grunau
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(3) : error A2079 : improper line syntax ; symbol expected
  *
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(4) : error A2079 : improper line syntax ; symbol expected
  * This file is part of FFmpeg.
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(5) : error A2079 : improper line syntax ; symbol expected
  *
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(6) : error A2079 : improper line syntax ; symbol expected
  * FFmpeg is free software ; you can redistribute it and/or
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(7) : error A2079 : improper line syntax ; symbol expected
  * modify it under the terms of the GNU Lesser General Public
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(8) : error A2079 : improper line syntax ; symbol expected
  * License as published by the Free Software Foundation ; either
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(9) : error A2079 : improper line syntax ; symbol expected
  * version 2.1 of the License, or (at your option) any later version.
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(10) : error A2079 : improper line syntax ; symbol expected
  *
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(11) : error A2079 : improper line syntax ; symbol expected
  * FFmpeg is distributed in the hope that it will be useful,
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(12) : error A2079 : improper line syntax ; symbol expected
  * but WITHOUT ANY WARRANTY ; without even the implied warranty of
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(13) : error A2079 : improper line syntax ; symbol expected
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(14) : error A2079 : improper line syntax ; symbol expected
  * Lesser General Public License for more details.
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(15) : error A2079 : improper line syntax ; symbol expected
  *
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(16) : error A2079 : improper line syntax ; symbol expected
  * You should have received a copy of the GNU Lesser General Public
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(17) : error A2079 : improper line syntax ; symbol expected
  * License along with FFmpeg ; if not, write to the Free Software
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(18) : error A2079 : improper line syntax ; symbol expected
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(19) : error A2079 : improper line syntax ; symbol expected
  */
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(21) : error A2230 : Illegal preprocessor directive ; only "#line [filename]" is recognized
  include "libavutil/aarch64/asm.S"
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(23) : error A2230 : Illegal preprocessor directive ; only "#line [filename]" is recognized
  define FRAC_BITS 23 // fractional bits for sb_samples and dct
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(24) : error A2230 : Illegal preprocessor directive ; only "#line [filename]" is recognized
  define WFRAC_BITS 16 // fractional bits for window
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(25) : error A2230 : Illegal preprocessor directive ; only "#line [filename]" is recognized
  define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(27) : error A2034 : unknown opcode : tbl_rev128_s
  const tbl_rev128_s, align=4
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(28) : error A2034 : unknown opcode : .
  .byte 12, 13, 14, 15
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(29) : error A2034 : unknown opcode : .
  .byte 8, 9, 10, 11
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(30) : error A2034 : unknown opcode : .
  .byte 4, 5, 6, 7
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(31) : error A2034 : unknown opcode : .
  .byte 0, 1, 2, 3
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(34) : error A2003 : improper line syntax : .
  .macro apply_window type, st
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(35) : error A2034 : unknown opcode : ff_mpadsp_apply_window_
  function ff_mpadsp_apply_window_\type()_neon, export=1
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(42) : error A2034 : unknown opcode : movrel
  movrel x15, tbl_rev128_s
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(44) : error A2003 : improper line syntax : .
  .ifc \type, fixed
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(46) : error A2003 : improper line syntax : .
  .else
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(48) : error A2003 : improper line syntax : .
  .endif
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(53) : error A2173 : syntax error in expression
  sub x5, x5, x4 // samples2
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(53) : error A2003 : improper line syntax : Trouble parsing operands
  sub x5, x5, x4 // samples2
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(54) : error A2173 : syntax error in expression
  neg x13, x4 // -incr
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(54) : error A2003 : improper line syntax : Trouble parsing operands
  neg x13, x4 // -incr
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(56) : error A2003 : improper line syntax : .
  .ifc \type, fixed
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(57) : error A2173 : syntax error in expression
  ld1r v16.2s, [x2] // dither_state
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(57) : error A2003 : improper line syntax : Trouble parsing operands
  ld1r v16.2s, [x2] // dither_state
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(60) : error A2061 : illegal expression type ; expected absolute numeric
  movi v30.2d, #(1/ 64 * 8 * sizeof(int32_t)
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(101) : error A2003 : improper line syntax : Trouble parsing operands
  sub x10, x10, #64<<5 // 64 * 8 * sizeof(int32_t)
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(103) : error A2003 : improper line syntax : .
  .ifc \type, fixed
  D :\Work\Chromium_FFmpeg\chromium\src\third_party\ffmpeg\libavcodec\aarch64\mpegaudiodsp_neon.S(105) : error A2034 : unknown opcode : ext
  ext v28.16b, v29.16b, v28.16b, #8
  .
  .
  .

• Puzzled with file descriptor in Bash (ffmpeg video capture)

  3 mai 2020, par ChrisAga

  I am trying to use file descriptors in Bash and found a problem I cannot solve.&#xA;I have to read a video stream coming from the standard output of a command executed in a coproc. This piece of code works as expected :

  &#xA;&#xA;

  ffmpeg \
    -i <(exec cat <&${COPROC[0]}) \
    -c:v $ENCODE_VIDEO_FORMAT_LOSSLESS $ENCODE_VIDEO_OPTIONS_LOSSLESS \
    -c:a copy \
    -progress /dev/fd/1 \
    "${capfile}"


  &#xA;&#xA;

  But the cat process is not really useful since ffmpeg -i pipe:<file descriptor="descriptor"></file> seems to do the same. So I tried the following code which fails with pipe:63: Bad file descriptor
 error.

  &#xA;&#xA;

  ffmpeg \
    -i pipe:"${COPROC[0]}" \
    -c:v $ENCODE_VIDEO_FORMAT_LOSSLESS $ENCODE_VIDEO_OPTIONS_LOSSLESS \
    -c:a copy \
    -progress /dev/fd/1 \
    "${capfile}"


  &#xA;&#xA;

  The actual script is something a bit complicated but here is a minimal testing code for this issue :

  &#xA;&#xA;

  #!/bin/bash
#

ENCODE_VIDEO_FORMAT_LOSSLESS=ffv1
ENCODE_VIDEO_OPTIONS_LOSSLESS="-level 3 -threads 7 -coder 1 -context 1 -g 1 -slices 30 -slicecrc 1"

capfile=capure.mkv

coproc ffmpeg  -i file:'Camomille.mkv' -c:v copy -c:a copy -f matroska pipe:1

capture_fd=${COPROC[0]}
echo "hk_capture_pid=${COPROC_PID}"

ffmpeg \
    -i pipe:${COPROC[0]} \
    -c:v $ENCODE_VIDEO_FORMAT_LOSSLESS $ENCODE_VIDEO_OPTIONS_LOSSLESS \
    -c:a copy \
    -progress /dev/fd/1 \
    "${capfile}"


  &#xA;&#xA;

  This is the output of the second ffmpeg command :

  &#xA;&#xA;

  ffmpeg version 4.1.4-1build2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.2.1-4ubuntu1)
  configuration: --prefix=/usr --extra-version=1build2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
pipe:63: Bad file descriptor
av_interleaved_write_frame(): Broken pipe                                                                                       
Error writing trailer of pipe:1: Broken pipe                                                                                    
frame=    4 fps=0.0 q=-1.0 Lsize=      48kB time=00:00:00.03 bitrate=10051.1kbits/s speed=3.44x    
video:86kB audio:1kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: unknown
Conversion failed!


  &#xA;&#xA;

  This one fails and if you replace -i pipe:${COPROC[0]} by -i <(exec cat <&${COPROC[0]}) a capture.mkv file is created.

  &#xA;&#xA;

  I run ubuntu eoan and bash version is : GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu). I upgraded several times since I started with this issue, so it wouldn't be related too much to bash and ffmpeg versions.

  &#xA;&#xA;

  If someone can point me to what I do wrong with bash file descriptors I would be grateful.

  &#xA;

• Undefined reference, using FFMpeg-library (AvCodec) on Ubuntu, 64-bits system

  5 mai 2012, par Anders Branderud

  I am running the example code of the latest FFMpeg-library.
  I have inserted the example code into the file videofecencoder.c :

  /*
  
  * copyright (c) 2001 Fabrice Bellard
  
  *
  
  * This file is part of Libav.
  
  *
  
  * Libav is free software; you can redistribute it and/or
  
  * modify it under the terms of the GNU Lesser General Public
  
  * License as published by the Free Software Foundation; either
  
  * version 2.1 of the License, or (at your option) any later version.
  
  *
  
  * Libav is distributed in the hope that it will be useful,
  
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  
  * Lesser General Public License for more details.
  
  *
  
  * You should have received a copy of the GNU Lesser General Public
  
  * License along with Libav; if not, write to the Free Software
  
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  
  */
  
  #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  
  
  
  
  
  #include 
  
  #include 
  
  #include 
  
  
  
  #ifdef HAVE_AV_CONFIG_H
  
  #undef HAVE_AV_CONFIG_H
  
  #endif
  
  
  
  #include "libavutil/imgutils.h"
  
  #include "libavutil/opt.h"
  
  #include "libavcodec/avcodec.h"
  
  #include "libavutil/mathematics.h"
  
  #include "libavutil/samplefmt.h"
  
  
  
  #define INBUF_SIZE 4096
  
  #define AUDIO_INBUF_SIZE 20480
  
  #define AUDIO_REFILL_THRESH 4096
  
  
  
  /*
  
  * Video encoding example
  
  */
  
  static void video_encode_example(const char *filename, int codec_id)
  
  {
  
     AVCodec *codec;
  
     AVCodecContext *c= NULL;
  
     int i, out_size, size, x, y, outbuf_size;
  
     FILE *f;
  
     AVFrame *picture;
  
     uint8_t *outbuf;
  
     int nrOfFramesPerSecond  =25;
  
     int nrOfSeconds =1;
  
  
  
  
  
     printf("Video encoding\n");
  
  
  
     /* find the mpeg1 video encoder */
  
     codec = avcodec_find_encoder((CodecID) codec_id);
  
     if (!codec) {
  
         fprintf(stderr, "codec not found\n");
  
         exit(1);
  
     }
  
  
  
     c = avcodec_alloc_context3(codec);
  
     picture= avcodec_alloc_frame();
  
  
  
     /* put sample parameters */
  
     c->bit_rate = 400000;
  
     /* resolution must be a multiple of two */
  
     c->width = 352;
  
     c->height = 288;
  
     /* frames per second */
  
     c->time_base= (AVRational){1,25};
  
     c->gop_size = 10; /* emit one intra frame every ten frames */
  
     c->max_b_frames=1;
  
     c->pix_fmt = PIX_FMT_YUV420P;
  
  
  
     if(codec_id == CODEC_ID_H264)
  
         av_opt_set(c->priv_data, "preset", "slow", 0);
  
  
  
     /* open it */
  
     if (avcodec_open2(c, codec, NULL) < 0) {
  
         fprintf(stderr, "could not open codec\n");
  
         exit(1);
  
     }
  
  
  
     f = fopen(filename, "wb");
  
     if (!f) {
  
         fprintf(stderr, "could not open %s\n", filename);
  
         exit(1);
  
     }
  
  
  
     /* alloc image and output buffer */
  
     outbuf_size = 100000;
  
     outbuf = (uint8_t*) malloc(outbuf_size);
  
  
  
     /* the image can be allocated by any means and av_image_alloc() is
  
      * just the most convenient way if av_malloc() is to be used */
  
     av_image_alloc(picture->data, picture->linesize,
  
                    c->width, c->height, c->pix_fmt, 1);
  
  
  
     /* encode 1 second of video */
  
     int nrOfFramesTotal = nrOfFramesPerSecond * nrOfSeconds;
  
  
  
     /* encode 1 second of video */
  
     for(i=0;i < nrOfFramesTotal; i++) {
  
         fflush(stdout);
  
         /* prepare a dummy image */
  
         /* Y */
  
         for(y=0;yheight;y++) {
  
             for(x=0;xwidth;x++) {
  
                 picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
  
             }
  
         }
  
  
  
         /* Cb and Cr */
  
         for(y=0;yheight/2;y++) {
  
             for(x=0;xwidth/2;x++) {
  
                 picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
  
                 picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
  
             }
  
         }
  
  
  
         /* encode the image */
  
         out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
  
         printf("encoding frame %3d (size=%5d)\n", i, out_size);
  
         fwrite(outbuf, 1, out_size, f);
  
     }
  
  
  
     /* get the delayed frames */
  
     for(; out_size; i++) {
  
         fflush(stdout);
  
  
  
         out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
  
         printf("write frame %3d (size=%5d)\n", i, out_size);
  
         fwrite(outbuf, 1, out_size, f);
  
     }
  
  
  
     /* add sequence end code to have a real mpeg file */
  
     outbuf[0] = 0x00;
  
     outbuf[1] = 0x00;
  
     outbuf[2] = 0x01;
  
     outbuf[3] = 0xb7;
  
     fwrite(outbuf, 1, 4, f);
  
     fclose(f);
  
     free(outbuf);
  
  
  
     avcodec_close(c);
  
     av_free(c);
  
     av_free(picture->data[0]);
  
     av_free(picture);
  
     printf("\n");
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
     const char *filename;
  
  
  
     /* register all the codecs */
  
     avcodec_register_all();
  
  
  
     if (argc <= 1) {
  
  
  
         video_encode_example("/grb_1.mpg", CODEC_ID_MPEG1VIDEO);
  
     } else {
  
         filename = argv[1];
  
     }
  
  
  
  
  
     return 0;
  
  }

  When I run gcc videofecencoder.cc -lavcodec I get the following error messages :

  /tmp/ccJg8IDy.o: In function `video_encode_example(char const*, int)':
  
  videofecencoder.cc:(.text+0x35): undefined reference to `avcodec_find_encoder(CodecID)'
  
  videofecencoder.cc:(.text+0x74): undefined reference to `avcodec_alloc_context3(AVCodec*)'
  
  videofecencoder.cc:(.text+0x7d): undefined reference to `avcodec_alloc_frame()'
  
  videofecencoder.cc:(.text+0x113): undefined reference to `av_opt_set(void*, char const*, char const*, int)'
  
  videofecencoder.cc:(.text+0x12b): undefined reference to `avcodec_open2(AVCodecContext*, AVCodec*, AVDictionary**)'
  
  videofecencoder.cc:(.text+0x1f0): undefined reference to `av_image_alloc(unsigned char**, int*, int, int, PixelFormat, int)'
  
  videofecencoder.cc:(.text+0x35c): undefined reference to `avcodec_encode_video(AVCodecContext*, unsigned char*, int, AVFrame const*)'
  
  videofecencoder.cc:(.text+0x3cf): undefined reference to `avcodec_encode_video(AVCodecContext*, unsigned char*, int, AVFrame const*)'
  
  videofecencoder.cc:(.text+0x47c): undefined reference to `avcodec_close(AVCodecContext*)'
  
  videofecencoder.cc:(.text+0x488): undefined reference to `av_free(void*)'
  
  videofecencoder.cc:(.text+0x497): undefined reference to `av_free(void*)'
  
  videofecencoder.cc:(.text+0x4a3): undefined reference to `av_free(void*)'
  
  /tmp/ccJg8IDy.o: In function `main':
  
  videofecencoder.cc:(.text+0x4c3): undefined reference to `avcodec_register_all()'
  
  collect2: ld returnerade avslutningsstatus 1

  The command nm libavcodec.a | grep avcodec_find results in :

  00000000000008e0 T avcodec_find_best_pix_fmt
  
  0000000000000740 T avcodec_find_best_pix_fmt2
  
                   U avcodec_find_encoder
  
  0000000000002ca0 T avcodec_find_decoder
  
  0000000000002cf0 T avcodec_find_decoder_by_name
  
  0000000000002bd0 T avcodec_find_encoder
  
  0000000000002c30 T avcodec_find_encoder_by_name

  I also have another similar error with another library :
  Undefined reference despite linking in OpenFEC-library

  My system : Ubuntu 11, 64-bits machine

  My next step is to try to compile it on VirtualBox with Ubuntu 32 bits (running on a Windows-OS).