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• Compile FFmpeg Zeranoe Build with Visual Studio 2013

  29 août 2017, par mFeinstein

  I downloaded the most recent Zeranoe dev build here, included the header files to my code, placed extern "C" around the includes, since this is a C++ project and FFmpeg is a C library, and added the libs to Visual Studio as well, and I get this linker error :

  1>Camera.obj : error LNK2019 : unresolved external symbol _av_free referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_freep referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_frame_alloc referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_frame_free referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_register_all referenced in function __catch$ ??0Camera@MicroDFV_Camera@@QAE@V ?$basic_string@DU ?$char_traits@D@std@@V ?$allocator@D@2@@std@@0PAX@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_alloc_context3 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_open2 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_close referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_init_packet referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_packet_unref referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_find_encoder referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_encode_video2 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_opt_set referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_image_alloc referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>M :\Desktop\OpenCVTest\Debug\OpenCVTest.exe : fatal error LNK1120 : 14 unresolved externals

  Searching here and on Google I found many recommendations, such as to add #pragma comment(lib,...), and that the libs are static, so their order is important, and none of this helps.

  So I scratched my head even more and realized that the Zeranoe build is made with MinGW-w64, so probably it won’t link with Visual Studio. I inspected the lib using dumpbin and the symbols on the libs don’t have the underscore, so I am pretty sure it won’t work.

  The other Zeranoe builds for Windows don’t have libs, they are just plain .exe or exe + .dll.

  Will I have to make my own VS2013 build of FFmpeg to link it, or is there some alternative way ?

• non-monotonous DTS in output stream

  21 septembre 2017, par Vishnu

  I have video1 and video2 , When I try to concat them , I get error - non-monotonous DTS in output stream

  Below is video 1 ffprobe output

  [flv @ 0x830ba0] video stream discovered after head already parsed
  [flv @ 0x830ba0] audio stream discovered after head already parsed
  Input #0, flv, from ’video/1.flv’ : Metadata : encoder : Lavf57.66.101
  Duration : 00:00:05.29, start : 0.083000, bitrate : 379 kb/s Stream #0:0 :
  Video : h264 (High), yuvj420p(pc, progressive), 1280x720 [SAR 1:1 DAR
  16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc Stream #0:1 : Audio : mp3, 22050
  Hz, mono, s16p, 32 kb/s 0

  Below is video 2 ffprobe output

  [flv @ 0xf71ba0] audio stream discovered after head already parsed [flv @ 0xf71ba0] video stream discovered after head already parsed
  Input #0, flv, from ’src/intro.flv’ : Metadata : major_brand : qt
  minor_version : 537199360 compatible_brands : qt encoder :
  Lavf57.76.100 Duration : 00:00:03.99, start : 0.000000, bitrate : 3729
  kb/s Stream #0:0 : Audio : mp3, 44100 Hz, stereo, s16p, 128 kb/s Stream
  0:1 : Video : flv1, yuv420p, 1280x720, 200 kb/s, 24 fps, 24 tbr, 1k tbn 0 Non looped Video

• ffmpeg batch reencode with subfolders

  25 janvier, par Alan

  I am trying to reencode a few hundred videos to X265 but there are many directories that have spaces in the filenames as do some of the files. I have looked at a bunch of scripts and am struggling to find one that works with the spaces and the different directory levels.

  



  This one works, as long as there is no sub directories :

  



  #!/bin/bash
for i in *.avi;
do 
    ffmpeg -i "$i" -c:v libx265 -c:a copy X265_"$i"
done


  



  I have been trying to work with this bash script, but it fails with the whitespaces I am guessing.

  



  #!/bin/bash
inputdir=$PWD
outputdir=$PWD
while IFS= read -r file ; do
  video=`basename "$file"`
  dir=`dirname "$file"`
 ffmpeg -fflags +genpts -i "$file" -c:v libx265 -c:a copy "$dir"/X265_"$video"
done < <(find "$inputdir" -name "*.avi" | head -100)


  



  On this thread it looks like a good solution for windows users, but not linux.
FFMPEG - Batch convert subfolders

  



  FOR /r %%i in (*.mp4) DO ffmpeg32 -i "%%~fi" -map 0:0 -map 0:1 -map 0:1 -c:v copy -c:a:0 aac -b:a 128k -ac 2 -strict -2 -cutoff 15000 -c:a:1 copy "%%~dpni(2)%%~xi"

  



  If you can point me to the right solution that is appropriate for bash, I would appreciate it.