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• How to build FFmpeg with Apple Symbols

  18 septembre 2021, par Meh.

  MOVED FROM : https://superuser.com/questions/1676856/how-to-build-ffmpeg-with-apple-symbols?noredirect=1#comment2572799_1676856

  


  I'm trying to build FFmpeg 3.2.4 with OpenSSL >= 2.0.7 (3.0.0) from source so I can use it's binaries to build Dolphin-Emu.

  


  I just do this : ./configure --enable-gnutls and when I build with make -j5 (-j5 speeds up the process) then make install. When I use it in compiling Dolphin , I get an error somewhat like this :

  


  Undefined symbols for architecture x86_64:
  "_kCVImageBufferColorPrimaries_ITU_R_709_2", referenced from:
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
  "_kVDADecoderConfiguration_SourceFormat", referenced from:
  "_kCVImageBufferTransferFunction_ITU_R_2020", referenced from:
      _ff_vda_create_decoder in libavcodec.a(vda_h264.o)
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
  "_kVDADecoderConfiguration_avcCData", referenced from:
  "_CMBlockBufferCopyDataBytes", referenced from:
      _ff_vda_create_decoder in libavcodec.a(vda_h264.o)
      _vtenc_frame in libavcodec.a(videotoolboxenc.o)
  "_kCVImageBufferYCbCrMatrixKey", referenced from:
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
      _vtenc_send_frame in libavcodec.a(videotoolboxenc.o)
  "_SSLSetCertificate", referenced from:
      _tls_open in libavformat.a(tls_securetransport.o)
  "_CMTimeMake", referenced from:
      _vtenc_send_frame in libavcodec.a(videotoolboxenc.o)
  "_kCVPixelBufferWidthKey", referenced from:
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
  "_VDADecoderCreate", referenced from:
      _ff_vda_create_decoder in libavcodec.a(vda_h264.o)
  "_kVTProfileLevel_H264_High_4_2", referenced from:
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
  "_kCVPixelBufferIOSurfacePropertiesKey", referenced from:
      _ff_vda_create_decoder in libavcodec.a(vda_h264.o)
  "_kVTProfileLevel_H264_Baseline_1_3", referenced from:
      _vtenc_init in libavcodec.a(videotoolboxenc.o)
(example)


  


  These _kV(blahblahblah) symbols are provided by Apple... under <coremedia></coremedia>CoreMedia.h> so my mac should DEFINITELY have this. OpenSSL version is 3.0.0 as there's an error about _SSLSetCertificate not existing.

  


  Does anyone have any ideas why this is throwing undefined symbols for existing symbols ? (My FFmpeg is compiled by clang whenever I use make, and I use gnutls(installed by brew) which should rely on openssl3.0)

  


  Xcode version : 11.3.1 (Only has macos 10.15 SDK)

  


• python3.6 ffmpeg call MacOSX (closed)

  30 mai 2020, par Awazleon

  I'm using Python 3.6 on MacOSX. I would like to use FFmpeg as Python sub-process. Everything works fine when using the OSX embedded Python 2.7 but using 3.6, this doesn't work.

  



  I get an error message because it doesn't find FFmepg :

  



  raise FFExecutableNotFoundError("Executable '{0}' not found".format(self.executable))
ffmpy.FFExecutableNotFoundError: Executable 'ffmpeg' not found


  



  I tried with ffmpy but I also got the same result by invoking FFmpeg directly :

  



  >>> from subprocess import call&#xA;>>> call(["ffmpeg"])&#xA;Traceback (most recent call last):&#xA;  File "", line 1, in <module>&#xA;    call(["ffmpeg"])&#xA;  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 267, in call&#xA;    with Popen(*popenargs, **kwargs) as p:&#xA;  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 707, in __init__&#xA;    restore_signals, start_new_session)&#xA;  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1326, in _execute_child&#xA;    raise child_exception_type(errno_num, err_msg)&#xA;FileNotFoundError: [Errno 2] No such file or directory: &#x27;ffmpeg&#x27;&#xA;</module>

  



  I installed the FFmpeg lib. by using Brew through Terminal. It was well installed but only visible by Python 2.7, not 3.6.

  



  Calling it from terminal is working :

  



  $ ffmpeg

ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda


  



  I'm not (yet) a Linux specialist but I think that a path is missing for 3.6 to find FFmpeg.

  



  Any clue to solve this annoying issue ?

  


• ffmpeg pipe image sequence error

  31 octobre 2017, par zylum

  With ffmpeg 3.4, you can now render svg image sequences. With the following it works :

  ffmpeg -i images/image-%02d.svg video.mp4

  However, piping via

  cat images/*.svg | ffmpeg -f image2pipe -c:v svg -i - video.mp4

  results in the following error

  ffmpeg version N-88409-ga8305b0ea3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.37)
  
    configuration: --prefix=./bin --enable-gpl --enable-nonfree --enable-librsvg --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libopus --enable-libxvid
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  1.100 / 58.  1.100
  
    libavformat    58.  0.102 / 58.  0.102
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  0.101 /  7.  0.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.100 /  3.  0.100
  
    libpostproc    55.  0.100 / 55.  0.100
  
  [image2pipe @ 0x7fe0d1800000] Could not find codec parameters for stream 0 (Video: svg (librsvg), none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, image2pipe, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: svg, none, 25 tbr, 25 tbn, 25 tbc
  
  Output #0, mp4, to 'video.mp4':
  
  Output file #0 does not contain any stream

  Digging into img2dec.c I can see it’s probing for <?xml on the first line and code> on the following line:

  static int svg_probe(AVProbeData *p)
  
  {
  
      const uint8_t *b = p->buf;
  
      const uint8_t *end = p->buf + p->buf_size;
  
      if (memcmp(p->buf, "<?xml", 5))
  
          return 0;
  
      while (b < end) {
  
          b += ff_subtitles_next_line(b);
  
          if (b >= end - 4)
  
              return 0;
  
          if (!memcmp(b, "code>

  All of the svg files in the folder have the appropriate headers

  <?xml version="1.0" encoding="utf-8"?>
  
  <svg xmlns="http://www.w3.org/2000/svg" width="640" height="640">
  
  </svg>

  What am I missing ?

  Lastly, I’m using a compiled version of ffmpeg since installing via brew install ffmpeg --with-librsvg didn’t seem to work. It installed fine, however it would give the following error

  Decoder (codec svg) not found for input stream #0:0