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• ffmpeg compilation error in windows 10 x64 for Visual Studio 2015 CE

  12 avril 2016, par Anqush

  So i was trying to use FFmpegInterop for win10 UWP application. And followed the specification given on https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT.

  here is some environment information :

  VS2015 Community Edition with 10.0.10240.0 SDK

  OS : Windows 10 Enterprise x64

  PATH were set to:Program Files (x86)/Microsoft Visual Studio 14.0/VC/BIN/x64_ARM

  So when i did this in msys2_shell.bat

  ../../../configure \
  
  --toolchain=msvc \
  
  --disable-programs \
  
  --disable-d3d11va \
  
  --disable-dxva2 \
  
  --arch=x86_64 \
  
  --enable-shared \
  
  --enable-cross-compile \
  
  --target-os=win32 \
  
  --extra-cflags="-MD -DWINAPI_FAMILY=WINAPI_FAMILY_APP -D_WIN32_WINNT=0x0A00" \
  
  --extra-ldflags="-APPCONTAINER WindowsApp.lib" \
  
  --prefix=../../../Build/Windows10/x64

  I got a warning regarding some pkg file that can’t be found and may cause library detection issues.

  For then i ignored it. After that i entered

  make

  this started a series of processing in which there is a lot of possibly harmful warnings. Like :-

  c:\ffmpeginterop\ffmpeg\libavcodec\get_bits.h(307): warning C4101: 're_cache': unreferenced local variable
  
  CC libavformat/srtdec.o
  
  srtdec.c
  
  c:\ffmpeginterop\ffmpeg\libavutil\libm.h(438): warning C4211: nonstandard extension used: redefined extern to static
  
  c:\ffmpeginterop\ffmpeg\libavformat\subtitles.h(189): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data

  So my question is that. Is this dangerous to proceed with. Can you help me for i should proceed with my project without any worry or not ? And i would be gratefull if anyone can guide me to watc out for specific errors that this could generate.

  I know this is a lot to ask. But i would be gratefull.
  Thanks

  Edit : Now i cant run the samples included in the ffmpeginterop package. The sample project wont debug. saying these are out of date.

• FFMPEG iOS XCode Build

  7 avril 2016, par Alec Gamble

  I’ve been playing around with ffmpeg in the command line recently to perform a few tasks and now I want to make an app which utilises some of it’s features. I’ve been looking at how to include it in my project with varied answers in the replies to other peoples questions.

  ffmpeg -i <filepath to="to" video="video"> -r <rate> <output location="location">/img_%03d.png
  
  </output></rate></filepath>

  to convert my video file to a series of images for image processing.

  My question is :

  How can I include the ffmpeg libraries in my project and then translate my command line function to run from my ObjectiveC++ file ?

  So far I’m struggling to even include it. I’ve tried downloading the normal and ios libraries as per the example in this question :
  How to Build FFMpeg as iOS Framework. But to no avail.

• FFmpeg concat with watermarks and audio "stream specifier in filtergraph description matches no streams."

  28 mars 2016, par btalbot

  I’m trying to concatenate an arbitrary number of videos with a series of watermarks over them :

  ffmpeg -i segment0.mp4 -i segment1.mp4 -i ... segmentn.mp4 -i end.mp4 -i ../../watermark/watermark1280/watermark_%05d.png -filter_complex "[0:v][1:v]...[n:v]concat=n=n:v=1:a=0 [v], [v] overlay [p]" -map "[v]" -an -y output.mp4

  I am getting the following error :

  Stream specifier ':v' in filtergraph description [0:v][1:v]...[n:v]concat=n=n:v=1:a=0 [v], [v] overlay [p] matches no streams.

  Here is the full output of my latest attempt :

  ffmpeg version N-78734-g666e2ed Copyright (c) 2000-2016 the FFmpeg developers
 built with gcc 5.3.0 (GCC)
 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
 libavutil      55. 19.100 / 55. 19.100
 libavcodec     57. 25.101 / 57. 25.101
 libavformat    57. 26.100 / 57. 26.100
 libavdevice    57.  0.101 / 57.  0.101
 libavfilter     6. 36.100 /  6. 36.100
 libswscale      4.  0.100 /  4.  0.100
 libswresample   2.  0.101 /  2.  0.101
 libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'segment0.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:02.01, start: 0.010000, bitrate: 6 kb/s
   Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'segment1.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:01.99, start: 0.066000, bitrate: 5014 kb/s
   Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 1280x720, 5008 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
   Metadata:
     handler_name    : VideoHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'segment2.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:02.01, start: 0.009000, bitrate: 424 kb/s
   Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1111 kb/s, 59 fps, 59 tbr, 15104 tbn, 118 tbc (default)
   Metadata:
     handler_name    : VideoHandler
   Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'segment3.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:01.85, start: 0.205000, bitrate: 5058 kb/s
   Stream #3:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 1280x720, 5050 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
   Metadata:
     handler_name    : VideoHandler
Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'segment4.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:01.77, start: 0.282000, bitrate: 5174 kb/s
   Stream #4:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 1280x720, 5167 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
   Metadata:
     handler_name    : VideoHandler
Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'segment5.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:02.01, start: 0.006000, bitrate: 955 kb/s
   Stream #5:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1448 kb/s, 59 fps, 59 tbr, 15104 tbn, 118 tbc (default)
   Metadata:
     handler_name    : VideoHandler
   Stream #5:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
Input #6, mov,mp4,m4a,3gp,3g2,mj2, from '../../slate/Void_test.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.26.100
 Duration: 00:00:02.97, start: 0.000000, bitrate: 3176 kb/s
   Stream #6:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 3169 kb/s, 59.94 fps, 59.94 tbr, 11988 tbn, 119.88 tbc (default)
   Metadata:
     handler_name    : VideoHandler
Input #7, image2, from '../../watermark/watermark1280/watermark_%05d.png':
 Duration: 00:00:14.40, start: 0.000000, bitrate: N/A
   Stream #7:0: Video: png, ya8(pc), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream specifier ':v' in filtergraph description [0:v][1:v][2:v][3:v][4:v][5:v][6:v]concat=n=7:v=1:a=0 [v], [v] overlay [p] matches no streams.

  Also, if someone can help me do this with a single mp3 audio input over the whole concatenated video, that’d be helpful, too.