Recherche avancée

Sur d’autres sites (2893)

• /usr/include/time.h:243:29 : error : expected identifier or ‘(’ before ‘__const’ [duplicate]

  27 novembre 2019, par user12408787

  This question already has an answer here :

  • FFmpeg : building example C codes
    
    1 answer
    

  When I used gcc to compile program，I meet this error messages，and i have searched answers online，but can not find any results，so I want to ask how to fix this？

• Shotdetect : compiling error ("undefined reference")

  8 juillet 2015, par Voprosnik

  I am using Cygwin and I trying to install the program Shotdetect. I downloaded the source with git and also downloaded, compiled and installed ffmpeg through git.

  Installation of shotdetect doesn’t follow the ./configure && make && make install routine, but a cmake system of which I have no experience. Nonetheless there is a script that automates compiling and installation.

  Near the final stages of the compiling, I get a long series of errors concerning some ffmpeg modules :

  Linking CXX executable shotdetect-cmd.exe
  
  /usr/local/lib/libavformat.a(matroskadec.o): In function `matroska_decode_buffer':
  
  /git/ffmpeg/libavformat/matroskadec.c:1321: undefined reference to `BZ2_bzDecompressInit'
  
  /git/ffmpeg/libavformat/matroskadec.c:1336: undefined reference to `BZ2_bzDecompress'
  
  /git/ffmpeg/libavformat/matroskadec.c:1329: undefined reference to `BZ2_bzDecompressEnd'
  
  /git/ffmpeg/libavformat/matroskadec.c:1339: undefined reference to `BZ2_bzDecompressEnd'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
  
  /git/ffmpeg/libavcodec/opusdec.c:374: undefined reference to `swr_is_initialized'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
  
  /git/ffmpeg/libavcodec/opusdec.c:220: undefined reference to `swr_is_initialized'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_init_resample':
  
  /git/ffmpeg/libavcodec/opusdec.c:161: undefined reference to `swr_init'
  
  /git/ffmpeg/libavcodec/opusdec.c:167: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
  
  /git/ffmpeg/libavcodec/opusdec.c:234: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_flush_resample':
  
  /git/ffmpeg/libavcodec/opusdec.c:115: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
  
  /git/ffmpeg/libavcodec/opusdec.c:406: undefined reference to `swr_close'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_flush':
  
  /git/ffmpeg/libavcodec/opusdec.c:567: undefined reference to `swr_close'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_close':
  
  /git/ffmpeg/libavcodec/opusdec.c:589: undefined reference to `swr_free'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_init':
  
  /git/ffmpeg/libavcodec/opusdec.c:642: undefined reference to `swr_alloc'
  
  /usr/local/lib/libavcodec.a(tiff.o): In function `tiff_uncompress_lzma':
  
  /git/ffmpeg/libavcodec/tiff.c:396: undefined reference to `lzma_stream_decoder'
  
  /git/ffmpeg/libavcodec/tiff.c:401: undefined reference to `lzma_code'
  
  /git/ffmpeg/libavcodec/tiff.c:402: undefined reference to `lzma_end'
  
  /usr/local/lib/libavcodec.a(utils.o): In function `recode_subtitle':
  
  /git/ffmpeg/libavcodec/utils.c:2672: undefined reference to `libiconv_open'
  
  /git/ffmpeg/libavcodec/utils.c:2707: undefined reference to `libiconv_close'
  
  /git/ffmpeg/libavcodec/utils.c:2693: undefined reference to `libiconv'
  
  /git/ffmpeg/libavcodec/utils.c:2694: undefined reference to `libiconv'
  
  /git/ffmpeg/libavcodec/utils.c:2707: undefined reference to `libiconv_close'
  
  /git/ffmpeg/libavcodec/utils.c:2707: undefined reference to `libiconv_close'
  
  /git/ffmpeg/libavcodec/utils.c:2707: undefined reference to `libiconv_close'
  
  /usr/local/lib/libavcodec.a(utils.o): In function `avcodec_open2':
  
  /git/ffmpeg/libavcodec/utils.c:1698: undefined reference to `libiconv_open'
  
  /git/ffmpeg/libavcodec/utils.c:1705: undefined reference to `libiconv_close'
  
  collect2: error: ld returned 1 exit status
  
  clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
  
  CMakeFiles/shotdetect-cmd.dir/build.make:122: recipe for target 'shotdetect-cmd.exe' failed
  
  make[2]: *** [shotdetect-cmd.exe] Error 1
  
  CMakeFiles/Makefile2:95: recipe for target 'CMakeFiles/shotdetect-cmd.dir/all' failed
  
  make[1]: *** [CMakeFiles/shotdetect-cmd.dir/all] Error 2
  
  Makefile:117: recipe for target 'all' failed
  
  make: *** [all] Error 2

  Searching online for similar errors, I found the following proposed solutions

  1) fix pkg-config setup so configure will find out all dependencies ;

  2) build ffmpeg (libavcodec) without external dependencies ;

  3) add external dependencies manually with configure —extra-ldflags

  I guess the problem lies on how i compiled ffmpeg (just configure with no options) but other than that have no idea what to do with either of the above suggestions. Should I recompile ffmpeg with different options ?

• Removing / Overlaying logo on mp4 video format with ffmpeg on linux

  13 juillet 2016, par SilverShadow

  I’m trying to remove logo from an .mp4 video format with ffmpeg on linux machine without re-encoding (for preserving the same quality) with the following command :

  ffmpeg -i input.mp4 -vf delogo=x=270:y=190:w=40:h=40 -c:a copy output.mp4

  and it give me the following errors :

  Unrecognized option 'vf'

  then a new error came up :

  Unable to find a suitable output format for 'delogo=x=270:y=190:w=40:h=40'

  ffmpeg always updating and it seems that they change command line arguments alot so any material or tutorial i find online seems to get out-dated quickly

  I review their website documentation but can’t get it to work, I think i’m missing something...?

  so what is the correct command line in linux shell also, how to view or find out exactly the area coordinates to be removed before actually removing logo/overlaying it and keep testing every while

  and how to overlay a solid color in certain area instead of removing logo transparently as well ?