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• ffmpeg installation undefined reference to

  8 février 2017, par user1683302

  I used this official link to download ffmpeg and compile it. I know it creates a static library and I have to reference the library folder. When i try to compile this tutorial . i get this errors

  tutorial01.c: In function ‘main’:
  
  tutorial01.c:96:5: warning: ‘codec’ is deprecated [-Wdeprecated- declarations]
  
   if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
  
   ^
  
  In file included from tutorial01.c:27:0:
  
   /home/osboxes/ffmpeg_build/include/libavformat/avformat.h:893:21: note:  declared here
  
   AVCodecContext *codec;
  
                   ^
  
  tutorial01.c:104:3: warning: ‘codec’ is deprecated [-Wdeprecated-declarations]
  
  pCodecCtxOrig=pFormatCtx->streams[videoStream]->codec;
  
  ^
  
  In file included from tutorial01.c:27:0:
  
  /home/osboxes/ffmpeg_build/include/libavformat/avformat.h:893:21: note: declared here
  
   AVCodecContext *codec;
  
                   ^
  
  tutorial01.c:113:3: warning: ‘avcodec_copy_context’ is deprecated  [-Wdeprecated-declarations]
  
   if(avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0) {
  
   ^
  
  In file included from tutorial01.c:26:0:
  
  /home/osboxes/ffmpeg_build/include/libavcodec/avcodec.h:4240:5: note: declared here
  
  int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
  
   ^
  
  tutorial01.c:131:3: warning: ‘avpicture_get_size’ is deprecated   [-Wdeprecated-declarations]
  
   numBytes=avpicture_get_size(AV_PIX_FMT_RGB24, pCodecCtx->width,
  
   ^
  
   In file included from tutorial01.c:26:0:
  
   /home/osboxes/ffmpeg_build/include/libavcodec/avcodec.h:5467:5: note: declared here
  
   int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
  
   ^
  
    tutorial01.c:138:3: warning: ‘avpicture_fill’ is deprecated [-Wdeprecated-declarations]
  
     avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_RGB24,
  
     ^
  
    In file included from tutorial01.c:26:0:
  
    /home/osboxes/ffmpeg_build/include/libavcodec/avcodec.h:5452:5: note: declared here
  
    int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
  
   ^
  
     tutorial01.c:160:7: warning: ‘avcodec_decode_video2’ is deprecated [-Wdeprecated-declarations]
  
         avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
         ^
  
   In file included from tutorial01.c:26:0:
  
    /home/osboxes/ffmpeg_build/include/libavcodec/avcodec.h:4811:5: note: declared here
  
    int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
  
   ^
  
    tutorial01.c:177:5: warning: ‘av_free_packet’ is deprecated [-Wdeprecated-declarations]
  
    av_free_packet(&packet);
  
    ^
  
   In file included from tutorial01.c:26:0:
  
   /home/osboxes/ffmpeg_build/include/libavcodec/avcodec.h:4472:6: note: declared here
  
   void av_free_packet(AVPacket *pkt);
  
    ^
  
  /tmp/ccHYDd9j.o: In function `main':
  
  tutorial01.c:(.text+0x178): undefined reference to `av_register_all'
  
  tutorial01.c:(.text+0x19f): undefined reference to `avformat_open_input'
  
  tutorial01.c:(.text+0x1c1): undefined reference to `avformat_find_stream_info'
  
  tutorial01.c:(.text+0x1f6): undefined reference to `av_dump_format'
  
  tutorial01.c:(.text+0x2ab): undefined reference to `avcodec_find_decoder'
  
  tutorial01.c:(.text+0x2ea): undefined reference to `avcodec_alloc_context3'
  
  tutorial01.c:(.text+0x304): undefined reference to `avcodec_copy_context'
  
  tutorial01.c:(.text+0x348): undefined reference to `avcodec_open2'
  
  tutorial01.c:(.text+0x35b): undefined reference to `av_frame_alloc'
  
  tutorial01.c:(.text+0x367): undefined reference to `av_frame_alloc'
  
  tutorial01.c:(.text+0x3a4): undefined reference to `avpicture_get_size'
  
  tutorial01.c:(.text+0x3ba): undefined reference to `av_malloc'
  
  tutorial01.c:(.text+0x3ef): undefined reference to `avpicture_fill'
  
  tutorial01.c:(.text+0x439): undefined reference to `sws_getContext'
  
  tutorial01.c:(.text+0x47d): undefined reference to `avcodec_decode_video2'
  
  tutorial01.c:(.text+0x4de): undefined reference to `sws_scale'
  
  tutorial01.c:(.text+0x527): undefined reference to `av_free_packet'
  
  tutorial01.c:(.text+0x53d): undefined reference to `av_read_frame'
  
  tutorial01.c:(.text+0x551): undefined reference to `av_free'
  
  tutorial01.c:(.text+0x560): undefined reference to `av_frame_free'
  
  tutorial01.c:(.text+0x56f): undefined reference to `av_frame_free'
  
  tutorial01.c:(.text+0x57b): undefined reference to `avcodec_close'
  
  tutorial01.c:(.text+0x58a): undefined reference to `avcodec_close'
  
  tutorial01.c:(.text+0x599): undefined reference to `avformat_close_input'
  
  collect2: error: ld returned 1 exit status

  i used this sudo gcc -I /home/osboxes/ffmpeg_build/include -L /home/osboxes/ffmpeg_build/lib -lavcode -lavformat -lavutil -lswscale -lz -lm tutorial01.c

  my ffmpeg is

   ffmpeg version N-82113-g490c6bd Copyright (c) 2000-2016 the FFmpeg developers
  
     built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.2) 20160609
  
     configuration: --prefix=/home/osboxes/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/osboxes/ffmpeg_build/include --extra-ldflags=- L/home/osboxes/ffmpeg_build/lib --bindir=/home/osboxes/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libopus --enable-libx264 --enable-nonfree
  
    libavutil      55. 33.100 / 55. 33.100
  
    libavcodec     57. 63.103 / 57. 63.103
  
    libavformat    57. 55.100 / 57. 55.100
  
    libavdevice    57.  0.103 / 57.  0.103
  
    libavfilter     6. 64.100 /  6. 64.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  2.100 /  2.  2.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  the tutorial code was update to work on new ffmpeg versions.I’m using VM Ubuntu 16.0.4 64 bit fresh install on windows 10 host.

  so why I’m having all of these errors ?

  Update :
  I moved to Ubuntu 12.04 VM and ffmpeg 0.11, I instilled it with opencv 2.4.2 here is the link . This should work yet i don’t why I’m having hard time compiling such small program.

  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
   built on Oct 25 2016 13:39:37 with gcc 4.6.3
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame    --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-pic
  
   libavutil      51. 54.100 / 51. 54.100
  
   libavcodec     54. 23.100 / 54. 23.100
  
   libavformat    54.  6.100 / 54.  6.100
  
   libavdevice    54.  0.100 / 54.  0.100
  
   libavfilter     2. 77.100 /  2. 77.100
  
   libswscale      2.  1.100 /  2.  1.100
  
   libswresample   0. 15.100 /  0. 15.100
  
   libpostproc    52.  0.100 / 52.  0.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  yet i still have the problem but it is less sever

   gcc -o tutorial01 tutorial01.c -Wl,--start-group -lavcodec -lavformat  -lswscale -lavutil -lz -lm -Wl,--end-group     
  
    /tmp/ccnFfu84.o: In function `main':
  
    tutorial01.c:(.text+0x500): undefined reference to `avcodec_free_frame'
  
    tutorial01.c:(.text+0x511): undefined reference to `avcodec_free_frame'
  
    collect2: ld returned 1 exit status

  i tried this ldconfig -p | grep av

    libxklavier.so.16 (libc6,x86-64) => /usr/lib/libxklavier.so.16
  
    libwavpack.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux gnu/libwavpack.so.1
  
  libjavascriptcoregtk-3.0.so.0 (libc6,x86-64) => /usr/lib/libjavascriptcoregtk-3.0.so.0
  
  libdvdnavmini.so.4 (libc6,x86-64) => /usr/lib/libdvdnavmini.so.4
  
  libdvdnav.so.4 (libc6,x86-64) => /usr/lib/libdvdnav.so.4
  
  libavutil.so.51 (libc6,x86-64) => /usr/local/lib/libavutil.so.51
  
  libavutil.so.51 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavutil.so.51
  
  libavutil.so (libc6,x86-64) => /usr/local/lib/libavutil.so
  
  libavformat.so.54 (libc6,x86-64) => /usr/local/lib/libavformat.so.54
  
  libavformat.so.53 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavformat.so.53
  
  libavformat.so (libc6,x86-64) => /usr/local/lib/libavformat.so
  
  libavfilter.so.2 (libc6,x86-64) => /usr/local/lib/libavfilter.so.2
  
  libavfilter.so (libc6,x86-64) => /usr/local/lib/libavfilter.so
  
  libavdevice.so.54 (libc6,x86-64) => /usr/local/lib/libavdevice.so.54
  
  libavdevice.so (libc6,x86-64) => /usr/local/lib/libavdevice.so
  
  libavc1394.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavc1394.so.0
  
  libavcodec.so.54 (libc6,x86-64) => /usr/local/lib/libavcodec.so.54
  
  libavcodec.so.53 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavcodec.so.53
  
  libavcodec.so (libc6,x86-64) => /usr/local/lib/libavcodec.so
  
  libavahi-ui-gtk3.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-ui-gtk3.so.0
  
  libavahi-gobject.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-gobject.so.0
  
  libavahi-glib.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-glib.so.1
  
  libavahi-core.so.7 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-core.so.7
  
  libavahi-common.so.3 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-common.so.3
  
  libavahi-common.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-common.so
  
  libavahi-client.so.3 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-client.so.3
  
  libavahi-client.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libavahi-client.so

  Update2

  I changged avcodec_free_frame to av_free and the file complied

  Dranger code is old

  Update 3
  i downloaded ffmpeg 1.0.10 which has the same library version that is the tutorial tested on. Everything complied without any problem now.

• Revision 100192 : $val[’htpass’] est défini plus haut, qui plus est là on le rendait vide

  26 octobre 2016, par kent1@… — Log

  $valhtpass ? est défini plus haut, qui plus est là on le rendait vide

• Why low qmax value improve video quality ?

  14 novembre 2013, par theateist

  Maybe my questions doesn't make sense due to not understanding but please explain me what I miss because I did read posts and wiki and still it's not clear to me.

  As I understand setting low value for qmax will improve the quality by increasing the bitrate.
  Maybe I didn't understood something but isn't lowing the Q(quantization) will decrease the quantization levels and thus the bitrate which means degradation in quality ? Or in ffmpeg lowing Q means increasing the quantization levels ? If the last is true so it make sense that lower qmax improves the quality.

  If the above is true, so increasing qmax will decrease the quantization levels which means less bits for coding a quantization level. So, if number of bits for a level is lower, so total bits per frame will be lower, so how the encoder manage to get to the desired bitrate ?