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Autres articles (79)

  • MediaSPIP Core : La Configuration

    9 novembre 2010, par

    MediaSPIP Core fournit par défaut trois pages différentes de configuration (ces pages utilisent le plugin de configuration CFG pour fonctionner) : une page spécifique à la configuration générale du squelettes ; une page spécifique à la configuration de la page d’accueil du site ; une page spécifique à la configuration des secteurs ;
    Il fournit également une page supplémentaire qui n’apparait que lorsque certains plugins sont activés permettant de contrôler l’affichage et les fonctionnalités spécifiques (...)

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

Sur d’autres sites (5536)

  • How to convert mkv to mp4 in ffmpeg losslessly

    16 novembre 2022, par crsswrdz

    I'm trying to losslessly convert an .mkv to .mp4.
(For use in Premiere Pro for film analysis and teaching).

    


    When I do so, I get a noticeable drop in file size (11gb to 2gb) and image quality.
The 5.1 streams are maintained but lose their mapping (everything seems displaced i.e. center channel now in the right channel) and the subtitles are lost.

    


    Is it possible to losslessly remux this .mkv to .mp4 ?
I don't want to re-encode it.

    


    E:\>ffmpeg -i Dune.mkv Dune.mp4
ffmpeg version 2022-11-03-git-5ccd4d3060-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57. 40.100 / 57. 40.100
  libavcodec     59. 51.101 / 59. 51.101
  libavformat    59. 34.101 / 59. 34.101
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 49.101 /  8. 49.101
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Input #0, matroska,webm, from 'Dune.mkv':
  Metadata:
    title           : Dune
    encoder         : libebml v1.4.2 + libmatroska v1.6.4
    creation_time   : 2021-10-17T11:10:41.000000Z
  Duration: 02:28:56.16, start: 0.000000, bitrate: 10192 kb/s
  Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x776, SAR 1:1 DAR 240:97, 25 fps, 25 tbr, 1k tbn (default)
    Metadata:
      BPS             : 9806853
      DURATION        : 02:28:56.160000000
      NUMBER_OF_FRAMES: 223404
      NUMBER_OF_BYTES : 10954451639
      _STATISTICS_WRITING_APP: mkvmerge v62.0.0.1 ('Apollo') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2021-10-17 11:10:41
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    Metadata:
      BPS             : 384000
      DURATION        : 02:28:56.128000000
      NUMBER_OF_FRAMES: 279254
      NUMBER_OF_BYTES : 428934144
      _STATISTICS_WRITING_APP: mkvmerge v62.0.0.1 ('Apollo') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2021-10-17 11:10:41
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:2(eng): Subtitle: subrip (forced)
    Metadata:
      title           : FORCED
      BPS             : 1
      DURATION        : 01:49:04.860000000
      NUMBER_OF_FRAMES: 43
      NUMBER_OF_BYTES : 1104
      _STATISTICS_WRITING_APP: mkvmerge v62.0.0.1 ('Apollo') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2021-10-17 11:10:41
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:3(eng): Subtitle: subrip (default)
    Metadata:
      BPS             : 34
      DURATION        : 02:20:49.064000000
      NUMBER_OF_FRAMES: 998
      NUMBER_OF_BYTES : 36676
      _STATISTICS_WRITING_APP: mkvmerge v62.0.0.1 ('Apollo') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2021-10-17 11:10:41
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (ac3 (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0000016e39c4a7c0] Using a PCE to encode channel layout "5.1(side)"
[libx264 @ 0000016e396ded40] using SAR=1/1
[libx264 @ 0000016e396ded40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000016e396ded40] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0000016e396ded40] 264 - core 164 r3101 b093bbe - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=4 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'Dune.mp4':
  Metadata:
    title           : Dune
    encoder         : Lavf59.34.101
  Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x776 [SAR 1:1 DAR 240:97], q=2-31, 25 fps, 12800 tbn (default)
    Metadata:
      BPS             : 9806853
      DURATION        : 02:28:56.160000000
      NUMBER_OF_FRAMES: 223404
      NUMBER_OF_BYTES : 10954451639
      _STATISTICS_WRITING_APP: mkvmerge v62.0.0.1 ('Apollo') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2021-10-17 11:10:41
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      encoder         : Lavc59.51.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1(side), fltp, 394 kb/s (default)
    Metadata:
      BPS             : 384000
      DURATION        : 02:28:56.128000000
      NUMBER_OF_FRAMES: 279254
      NUMBER_OF_BYTES : 428934144
      _STATISTICS_WRITING_APP: mkvmerge v62.0.0.1 ('Apollo') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2021-10-17 11:10:41
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      encoder         : Lavc59.51.101 aac
frame=115222 fps=216 q=28.0 00000000000000000000000004009000size= 1180416kB time=01:16:52.41 bitrate=2096.5kbits/s speed=8.65x



    


  • Compile Shotdetect on CentOS 7

    14 septembre 2015, par BitLegacy01

    I’m migrating a service from a Debian server to a CentOS 7 one.

    The service needs the Shotdetect command (github , official site).

    I could not make it work on CentOS though I followed all steps :

    1. Compile ffmpeg compilation guide

      # ffmpeg
      
ffmpeg version git-2015-08-21-7a806c6 Copyright (c) 2000-2015 the FFmpeg developers
      
  built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-9)
      
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --disable-libmp3lame --disable-libopus --disable-libvorbis --disable-libvpx --enable-libx264 --disable-libx265 --disable-lzma
      
  libavutil      54. 31.100 / 54. 31.100
      
  libavcodec     56. 58.100 / 56. 58.100
      
  libavformat    56. 40.101 / 56. 40.101
      
  libavdevice    56.  4.100 / 56.  4.100
      
  libavfilter     5. 36.100 /  5. 36.100
      
  libswscale      3.  1.101 /  3.  1.101
      
  libswresample   1.  2.101 /  1.  2.101
      
  libpostproc    53.  3.100 / 53.  3.100
      
Hyper fast Audio and Video encoder
      
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

      1. Install needed packages

        # yum install gd-devel libxml2-devel libxslt-devel clang libvpx libvorbis

      2. Add pthread in the CMakeList file, in TARGET_LINK_LIBRARIES, because it throws an lpthread missing in linker error

      3. Compile Shotdetect

        # FFMPEG_DIR="/root/ffmpeg_build"  ./compile.sh cmd

    5.Lost in contemplation

    -- avformat library found: /root/ffmpeg_build/lib/libavformat.a
    
-- avcodec library found: /root/ffmpeg_build/lib/libavcodec.a
    
-- avutil library found: /root/ffmpeg_build/lib/libavutil.a
    
-- swscale library found: /root/ffmpeg_build/lib/libswscale.a
    
Found all FFmpeg libraries in /root/ffmpeg_build/lib/libavformat.a;/root/ffmpeg_build/lib/libavdevice.a;/root/ffmpeg_build/lib/libavcodec.a;/root/ffmpeg_build/lib/libavutil.a;/root/ffmpeg_build/lib/libswscale.a.
    
-- Found GD: /usr/lib64/libgd.so
    
Found libgd: /usr/lib64/libgd.so;/usr/lib64/libpng.so;/usr/lib64/libz.so;/usr/lib64/libjpeg.so in /usr/include
    
Found libxml2: /usr/lib64/libxml2.so in /usr/include/libxml2
    
Found libxslt: /usr/lib64/libxslt.so in /usr/include
    
-- Configuring done
    
-- Generating done
    
-- Build files have been written to: /root/Shotdetect-master/build
    
[ 71%] Built target shotdetect
    
Linking CXX executable shotdetect-cmd
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_frame »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:323: undefined reference to « aacDecoder_Fill »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:329: undefined reference to « aacDecoder_DecodeFrame »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « get_stream_info »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:88: undefined reference to « aacDecoder_GetStreamInfo »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_close »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:201: undefined reference to « aacDecoder_Close »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_init »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:214: undefined reference to « aacDecoder_Open »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:221: undefined reference to « aacDecoder_ConfigRaw »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:228: undefined reference to « aacDecoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:252: undefined reference to « aacDecoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:270: undefined reference to « aacDecoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:277: undefined reference to « aacDecoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:284: undefined reference to « aacDecoder_SetParam »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o):/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:291: encore plus de références indéfinies suivent vers « aacDecoder_SetParam »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_init »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:261: undefined reference to « aacDecoder_AncDataInit »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacdec.o): in the function « fdk_aac_decode_flush »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacdec.c:367: undefined reference to « aacDecoder_SetParam »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_close »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:97: undefined reference to « aacEncClose »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_frame »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:357: undefined reference to « aacEncEncode »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_init »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:114: undefined reference to « aacEncOpen »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:123: undefined reference to « aacEncoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:130: undefined reference to « aacEncoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:138: undefined reference to « aacEncoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:172: undefined reference to « aacEncoder_SetParam »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:179: undefined reference to « aacEncoder_SetParam »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o):/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:197: encore plus de références indéfinies suivent vers « aacEncoder_SetParam »
    
/root/ffmpeg_build/lib/libavcodec.a(libfdk-aacenc.o): in the function « aac_encode_init »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:276: undefined reference to « aacEncEncode »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libfdk-aacenc.c:282: undefined reference to « aacEncInfo »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_frame »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:260: undefined reference to « x264_picture_init »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:262: undefined reference to « x264_bit_depth »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « reconfig_encoder »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:246: undefined reference to « x264_encoder_reconfig »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_frame »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:283: undefined reference to « x264_encoder_encode »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:289: undefined reference to « x264_encoder_delayed_frames »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:283: undefined reference to « x264_encoder_encode »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « reconfig_encoder »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:173: undefined reference to « x264_encoder_reconfig »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:178: undefined reference to « x264_encoder_reconfig »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:185: undefined reference to « x264_encoder_reconfig »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:205: undefined reference to « x264_encoder_reconfig »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:211: undefined reference to « x264_encoder_reconfig »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o):/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:191: encore plus de références indéfinies suivent vers « x264_encoder_reconfig »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_init_static »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:806: undefined reference to « x264_bit_depth »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_close »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:339: undefined reference to « x264_encoder_close »
    
/root/ffmpeg_build/lib/libavcodec.a(libx264.o): in the function « X264_init »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:413: undefined reference to « x264_param_default »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:418: undefined reference to « x264_param_default_preset »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:440: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:470: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:514: undefined reference to « x264_levels »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:516: undefined reference to « x264_levels »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:540: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:541: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:542: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:543: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:601: undefined reference to « x264_param_apply_fastfirstpass »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:651: undefined reference to « x264_param_apply_profile »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:703: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:705: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:717: undefined reference to « x264_param_parse »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:735: undefined reference to « x264_encoder_open_148 »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/libx264.c:744: undefined reference to « x264_encoder_headers »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_subpacket »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:379: undefined reference to « swr_is_initialized »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_frame »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:220: undefined reference to « swr_is_initialized »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_init_resample »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:161: undefined reference to « swr_init »
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:167: undefined reference to « swr_convert »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_frame »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:234: undefined reference to « swr_convert »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_flush_resample »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:115: undefined reference to « swr_convert »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_subpacket »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:411: undefined reference to « swr_close »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_flush »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:614: undefined reference to « swr_close »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_close »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:638: undefined reference to « swr_free »
    
/root/ffmpeg_build/lib/libavcodec.a(opusdec.o): in the function « opus_decode_init »:
    
/root/ffmpeg_sources/ffmpeg/libavcodec/opusdec.c:705: undefined reference to « swr_alloc »
    
clang: error: linker command failed with exit code 1 (use -v to see invocation)
    
make[2]: *** [shotdetect-cmd] Error 1
    
make[1]: *** [CMakeFiles/shotdetect-cmd.dir/all] Error 2
    
make: *** [all] Error 2

    I’ve done a lot of research about the above errors but I didn’t find any clue.

    How to compile successfully Shotdetect on CentOS7 ?

    Thanks to tryp here is a working CMakelist file :

    # CMake integration by Christian Frisson
    
cmake_minimum_required(VERSION 2.8)
    
PROJECT(shotdetect)
    

    
SET(CMAKE_C_COMPILER "/usr/bin/clang")
    
SET(CMAKE_CXX_COMPILER "/usr/bin/clang++")
    
SET(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
    

    

    
# Get git version information for automatic embedding in version string:
    

    
include(GetGitRevisionDescription)
    
get_git_head_revision(GIT_REFSPEC GIT_SHA1)
    
# Take the first 12 characters of the SHA1 as short identifier:
    
STRING(SUBSTRING ${GIT_SHA1} 0 11 GIT_SHA1_SHORT)
    
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/version.cc.in" "${CMAKE_CURRENT_BINARY_DIR}/version.cc" @ONLY)
    
list(APPEND SOURCES "${CMAKE_CURRENT_BINARY_DIR}/version.cc" src/version.h)
    

    
# Miscellaneous compilation options:
    

    
OPTION(USE_WXWIDGETS "Compile GUI app with wxWidgets, otherwise commandline app" ON)
    
OPTION(USE_POSTGRESQL "Compile with PostgreSQL support" OFF)
    

    
# Dependency: pkg-config (required if cross-compiling with MXE)
    

    
IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
    
    FIND_PACKAGE (PkgConfig)
    
    IF(NOT PKG_CONFIG_FOUND)
    
        MESSAGE(FATAL_ERROR "pkgconfig required for cross-compiling with MXE for windows")
    
    ENDIF()
    
    SET(PKG_CONFIG_EXECUTABLE ${PKG_CONFIG_EXECUTABLE} CACHE STRING "pkg-config")
    
ENDIF()
    

    
# Dependency: FFmpeg (required)
    

    
FIND_PACKAGE( FFmpeg )
    
IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
    
    PKG_CHECK_MODULES (FFMPEG_PKG REQUIRED libavcodec libavfilter libavutil libavdevice libavformat libavformat libswscale)
    
    IF (FFMPEG_PKG_FOUND)
    
        MESSAGE( "FFmpeg cflags found through pkg-config: ${FFMPEG_PKG_CFLAGS}" )
    
        MESSAGE( "FFmpeg ldflags found through pkg-config: ${FFMPEG_PKG_LDFLAGS}" )
    
        STRING(REGEX REPLACE ";" " " FFMPEG_PKG_CFLAGS "${FFMPEG_PKG_CFLAGS}")
    
        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${FFMPEG_PKG_CFLAGS}")
    
        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FFMPEG_PKG_CFLAGS}")
    
        SET(FFMPEG_LIBRARIES ${FFMPEG_LIBRARY} ${FFMPEG_PKG_LDFLAGS})
    
        MESSAGE("FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES}")
    
    ELSE (FFMPEG_PKG_FOUND)
    
        MESSAGE( FATAL_ERROR "FFmpeg cflags/ldflags not found through pkg-config." )
    
    ENDIF (FFMPEG_PKG_FOUND)
    
ENDIF()
    
IF(FFMPEG_LIBAVFORMAT_FOUND)
    
    MESSAGE(STATUS "avformat library found: ${FFMPEG_LIBAVFORMAT_LIBRARIES}")
    
ELSE()
    
    MESSAGE(STATUS "avformat library not found.")
    
ENDIF()
    
IF(FFMPEG_LIBAVCODEC_FOUND)
    
    MESSAGE(STATUS "avcodec library found: ${FFMPEG_LIBAVCODEC_LIBRARIES}")
    
ELSE()
    
    MESSAGE(STATUS "avcodec library not found.")
    
ENDIF()
    
IF(FFMPEG_LIBAVUTIL_FOUND)
    
    MESSAGE(STATUS "avutil library found: ${FFMPEG_LIBAVUTIL_LIBRARIES}")
    
ELSE()
    
    MESSAGE(STATUS "avutil library not found.")
    
ENDIF()
    
IF(FFMPEG_LIBSWSCALE_FOUND)
    
    MESSAGE(STATUS "swscale library found: ${FFMPEG_LIBSWSCALE_LIBRARIES}")
    
ELSE()
    
    MESSAGE(STATUS "swscale library not found.")
    
ENDIF()
    
IF(FFMPEG_FOUND)
    
    INCLUDE_DIRECTORIES(${FFMPEG_INCLUDE_DIR} ${FFMPEG_INCLUDE_DIRS})
    
    SET(FFMPEG_LIBRARIES "${FFMPEG_LIBRARIES};/root/ffmpeg_build/lib/libswresample.a;/root/ffmpeg_build/lib/libx264.a;/lib64/libdl.so.2;/root/ffmpeg_build/lib/libfdk-aac.a;/root/ffmpeg_build/lib/libswresample.a")
    
    MESSAGE("Found all FFmpeg libraries in ${FFMPEG_LIBRARIES}.")
    
ELSE()
    
    MESSAGE(FATAL_ERROR "Some FFmpeg libraries are missing.")
    
ENDIF()
    

    
# Dependency: GD (required)
    

    
FIND_PACKAGE(GD REQUIRED)
    
IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
    
    EXEC_PROGRAM(${CMAKE_FIND_ROOT_PATH}/bin/gdlib-config ARGS "--cflags" OUTPUT_VARIABLE GD_PKG_CFLAGS) 
    
    EXEC_PROGRAM(${CMAKE_FIND_ROOT_PATH}/bin/gdlib-config ARGS "--libs" OUTPUT_VARIABLE GD_PKG_LDFLAGS)
    
    MESSAGE( "gd cflags found through gdlib-config: ${GD_PKG_CFLAGS}" )
    
    MESSAGE( "gd ldflags found through gdlib-config: ${GD_PKG_LDFLAGS}" )
    
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GD_PKG_CFLAGS}")
    
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GD_PKG_CFLAGS}")
    
    SET(GD_LIBRARIES ${GD_LIBRARY} ${GD_PKG_LDFLAGS})
    
    MESSAGE("GD_LIBRARIES ${GD_LIBRARIES}")
    
ENDIF()
    
IF(GD_FOUND)
    
    INCLUDE_DIRECTORIES(${GD_INCLUDE_DIR})
    
    MESSAGE("Found libgd: ${GD_LIBRARIES} in ${GD_INCLUDE_DIR}")
    
ELSE()
    
    MESSAGE(FATAL_ERROR "Couldn't find libgd")
    
ENDIF()
    

    
# Dependency: libxml2 (required)
    

    
FIND_PACKAGE(LibXml2 2.7 REQUIRED)
    
IF ( MINGW AND CMAKE_TOOLCHAIN_FILE)
    
    PKG_CHECK_MODULES (LIBXML2_PKG REQUIRED libxml-2.0)
    
    IF (LIBXML2_PKG_FOUND)
    
        MESSAGE( "LibXml2 cflags found through pkg-config: ${LIBXML2_PKG_CFLAGS}" )
    
        MESSAGE( "LibXml2 ldflags found through pkg-config: ${LIBXML2_PKG_LDFLAGS}" )
    
        STRING(REGEX REPLACE ";" " " LIBXML2_PKG_CFLAGS "${LIBXML2_PKG_CFLAGS}")
    
        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBXML2_PKG_CFLAGS}")
    
        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBXML2_PKG_CFLAGS}")
    
        SET(LIBXML2_LIBRARIES ${LIBXML2_LIBRARY} ${LIBXML2_PKG_LDFLAGS})
    
        MESSAGE("LIBXML2_LIBRARIES ${LIBXML2_LIBRARIES}")
    
    ELSE (LIBXML2_PKG_FOUND)
    
        MESSAGE( FATAL_ERROR "LibXml2 cflags/ldflags not found through pkg-config." )
    
    ENDIF (LIBXML2_PKG_FOUND)
    
ENDIF()
    
IF(LIBXML2_FOUND)
    
    MESSAGE("Found libxml2: ${LIBXML2_LIBRARIES} in ${LIBXML2_INCLUDE_DIR}")
    
    INCLUDE_DIRECTORIES(${LIBXML2_INCLUDE_DIR})
    
ELSE()
    
    MESSAGE(FATAL_ERROR "Couldn't find libxml2")
    
ENDIF()
    

    
# Dependency: libxslt (required)
    

    
FIND_PACKAGE(LibXslt REQUIRED)
    
IF(LIBXSLT_FOUND)
    
    MESSAGE("Found libxslt: ${LIBXSLT_LIBRARIES} in ${LIBXSLT_INCLUDE_DIR}")
    
    INCLUDE_DIRECTORIES(${LIBXSLT_INCLUDE_DIR})
    
ELSE()
    
    MESSAGE(FATAL_ERROR "Couldn't find libxslt")
    
ENDIF()
    

    
# Dependency: wxWidgets (optional)
    
IF(USE_WXWIDGETS)
    
    FIND_PACKAGE(wxWidgets)# COMPONENTS core base)
    
    IF(wxWidgets_FOUND)
    
        MESSAGE("Found wxWidgets: ${wxWidgets_LIBRARIES} in ${wxWidgets_INCLUDE_DIRS}")
    
        INCLUDE_DIRECTORIES(${wxWidgets_INCLUDE_DIRS})
    
        ADD_DEFINITIONS(-DWXWIDGETS)
    
        INCLUDE("${wxWidgets_USE_FILE}")
    
    ELSE()
    
        MESSAGE(FATAL_ERROR "Couldn't find wxWidgets. Set USE_WXWIDGETS to OFF or install wxWidgets.")
    
    ENDIF()
    
ENDIF()
    

    
# Dependency: PostgreSQL (optional)
    
IF(USE_POSTGRESQL)
    
    FIND_PACKAGE(PostgreSQL)
    
    IF(PostgreSQL_FOUND)
    
        MESSAGE("Found PostgreSQL: ${PostgreSQL_LIBRARIES} in ${PostgreSQL_INCLUDE_DIR}")
    
        INCLUDE_DIRECTORIES(${PostgreSQL_INCLUDE_DIR})
    
    ELSE()
    
        MESSAGE(FATAL_ERROR "Couldn't find PostgreSQL. Set USE_POSTGRESQL to OFF or install PostgreSQL.")
    
    ENDIF()
    
ENDIF()
    

    
# shotdetect
    

    
SET(TARGET_NAME "shotdetect")
    
INCLUDE_DIRECTORIES(.)
    

    
# shotdetect library
    

    
SET(${TARGET_NAME}_LIBRARY_SRCS src/film.cc src/graph.cc src/image.cc src/shot.cc src/xml.cc)
    
SET(${TARGET_NAME}_LIBRARY_HDRS  src/film.h src/graph.h src/image.h src/shot.h src/xml.h)
    
IF(USE_POSTGRESQL)
    
    SET(${TARGET_NAME}_LIBRARY_SRCS ${${TARGET_NAME}_LIBRARY_SRCS} src/bdd.cc)
    
    SET(${TARGET_NAME}_LIBRARY_HDRS ${${TARGET_NAME}_LIBRARY_HDRS} src/bdd.h)
    
ENDIF()
    
ADD_LIBRARY(${TARGET_NAME} ${${TARGET_NAME}_LIBRARY_SRCS} ${${TARGET_NAME}_LIBRARY_HDRS})
    
TARGET_LINK_LIBRARIES(${TARGET_NAME} ${FFMPEG_LIBRARIES} ${LIBXML2_LIBRARIES} ${LIBXSLT_LIBRARIES} ${GD_LIBRARIES} "pthread" "m" "z")
    
IF(USE_WXWIDGETS AND wxWidgets_FOUND)
    
    TARGET_LINK_LIBRARIES(${TARGET_NAME} ${wxWidgets_LIBRARIES})
    
ENDIF()
    
IF(USE_POSTGRESQL AND PostgreSQL_FOUND)
    
    TARGET_LINK_LIBRARIES(${TARGET_NAME} ${PostgreSQL_LIBRARY})
    
ENDIF()
    

    
# shotdetect application: gui or commandline
    

    
IF(APPLE)
    
    SET(APP_TYPE "MACOSX_BUNDLE")
    
ELSEIF(WIN32)
    
    SET(APP_TYPE "WIN32")
    
ENDIF()
    

    
IF(USE_WXWIDGETS AND wxWidgets_FOUND)
    
    LIST(APPEND ${TARGET_NAME}_GUI_SRCS src/main.cc src/ui/dialog_help.cc src/ui/dialog_shotdetect.cc src/ui/process_video_thread.cc)
    
    LIST(APPEND ${TARGET_NAME}_GUI_HDRS src/ui/dialog_help.h src/ui/dialog_shotdetect.h src/ui/process_video_thread.h)
    
    ADD_EXECUTABLE(${TARGET_NAME}-gui ${APP_TYPE} ${SOURCES} ${${TARGET_NAME}_GUI_SRCS} ${${TARGET_NAME}_GUI_HDRS})
    
    TARGET_LINK_LIBRARIES(${TARGET_NAME}-gui ${TARGET_NAME})
    
    # Make this target optional to install:
    
    SET(TARGETS_TO_INSTALL ${TARGET_NAME}-gui)
    
ELSE()
    
    LIST(APPEND ${TARGET_NAME}_COMMANDLINE_SRCS src/commandline.cc)
    
    ADD_EXECUTABLE(${TARGET_NAME}-cmd ${SOURCES} ${${TARGET_NAME}_COMMANDLINE_SRCS})
    
    TARGET_LINK_LIBRARIES(${TARGET_NAME}-cmd ${TARGET_NAME})
    
    # Make this target optional to install:
    
    SET(TARGETS_TO_INSTALL ${TARGET_NAME}-cmd)
    
ENDIF()
    

    

    
# Routines for installing shotdetect.
    
# Taken from official documentation (http://www.cmake.org/cmake/help/cmake2.6docs.html#command:install)
    
install( 
    
    TARGETS ${TARGETS_TO_INSTALL}
    
    RUNTIME DESTINATION bin
    
    LIBRARY DESTINATION lib
    
    ARCHIVE DESTINATION lib/static
    
)

    the built binary will be in the built directory, you can move there and execute

    make install

    to make the binary system wide.

  • Brute Force Dimensional Analysis

    15 juillet 2010, par Multimedia Mike — Game Hacking, Python

    I was poking at the data files of a really bad (is there any other kind ?) interactive movie video game known simply by one letter : D. The Sega Saturn version of the game is comprised primarily of Sega FILM/CPK files, about which I wrote the book. The second most prolific file type bears the extension ’.dg2’. Cursory examination of sample files revealed an apparently headerless format. Many of the video files are 288x144 in resolution. Multiplying that width by that height and then doubling it (as in, 2 bytes/pixel) yields 82944, which happens to be the size of a number of these DG2 files. Now, if only I had a tool that could take a suspected raw RGB file and convert it to a more standard image format.

    Here’s the FFmpeg conversion recipe I used :

     ffmpeg -f rawvideo -pix_fmt rgb555 -s 288x144 -i raw_file -y output.png

    So that covers the files that are suspected to be 288x144 in dimension. But what about other file sizes ? My brute force approach was to try all possible dimensions that would yield a particular file size. The Python code for performing this operation is listed at the end of this post.

    It’s interesting to view the progression as the script compresses to different sizes :



    That ’D’ is supposed to be red. So right away, we see that rgb555(le) is not the correct input format. Annoyingly, FFmpeg cannot handle rgb555be as a raw input format. But this little project worked well enough as a proof of concept.

    If you want to toy around with these files (and I know you do), I have uploaded a selection at : http://multimedia.cx/dg2/.

    Here is my quick Python script for converting one of these files to every acceptable resolution.

    work-out-resolution.py :

    PLAIN TEXT
    PYTHON :
    1. # !/usr/bin/python
    2.  
    3. import commands
    4. import math
    5. import os
    6. import sys
    7.  
    8. FFMPEG = "/path/to/ffmpeg"
    9.  
    10. def convert_file(width, height, filename) :
    11.  outfile = "%s-%dx%d.png" % (filename, width, height)
    12.  command = "%s -f rawvideo -pix_fmt rgb555 -s %dx%d -i %s -y %s" % (FFMPEG, width, height, filename, outfile)
    13.  commands.getstatusoutput(command)
    14.  
    15. if len(sys.argv) <2 :
    16.  print "USAGE : work-out-resolution.py <file>"
    17.  sys.exit(1)
    18.  
    19. filename = sys.argv[1]
    20. if not os.path.exists(filename) :
    21.  print filename + " does not exist"
    22.  sys.exit(1)
    23.  
    24. filesize = os.path.getsize(filename) / 2
    25.  
    26. limit = int(math.sqrt(filesize)) + 1
    27. for i in xrange(1, limit) :
    28.  if filesize % i == 0 and filesize & 1 == 0 :
    29.   convert_file(i, filesize / i, filename)
    30.   convert_file(filesize / i, i, filename)

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