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• configure : Move license checks directly after command line parsing

  27 mars 2013, par Diego Biurrun

  configure : Move license checks directly after command line parsing
  This will allow to error out immediately if incompatible options are
  
  passed on the command line instead of running time-consuming tests.
  

  • [DBH] configure

• Android FFmpeg build : cannot find -lavutil

  4 novembre 2016, par Jon G

  I am trying to build FFmpeg for Android JNI using the guide here (forked from appunite’s build). One difference between my build and theirs is that I am trying to use the FFmpeg master branch instead of commit 82db8ee, maybe that is relevant. I am coming across a build issue when I try to build for multiple architectures in a row.

  The code that is running is :

  ${LD} -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib -soname $SONAME -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o $OUT_LIBRARY -lavformat -lavcodec -lx264 -lavfilter -lavutil -lswscale -lswresample -lavresample -lfribidi -lvo-aacenc -lvo-amrwbenc -lpostproc -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker -zmuldefs $PREBUILT/lib/gcc/$EABIARCH/$COMPILATOR_VERSION.x/libgcc.a

  The logs that are outputted in the MIPS case are :

  ...
  
  FINISHED ffmpeg for mips
  
  + build_one
  
  + echo 'Starting build one for mips'
  
  Starting build one for mips
  
  + cd ffmpeg
  
  + /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-ld -rpath-link=/home/jon/Development/android-ndk-r10e/platforms/android-9/arch-mips//usr/lib -L/home/jon/Development/android-ndk-r10e/platforms/android-9/arch-mips//usr/lib -L/home/jon/workspace/kyawkyaw-AndroidFFmpeg/library-jni/jni/ffmpeg-build/mips/lib -soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o /home/jon/workspace/kyawkyaw-AndroidFFmpeg/library-jni/jni/ffmpeg-build/mips/libffmpeg.so -lavcodec -lavformat -lavresample -lavutil -lfdk-aac -lswresample -lx264 -lswscale -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker -zmuldefs /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/mipsel-linux-android/4.9/libgcc.a
  
  /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-ld: skipping incompatible /home/jon/workspace/kyawkyaw-AndroidFFmpeg/library-jni/jni/ffmpeg-build/mips/lib/libavutil.a when searching for -lavutil
  
  /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-ld: cannot find -lavutil

  Everything seems successful until that point. Why would libavutil.a be incompatible ?

  I find that if I revert FFmpeg to commit 82db8ee, build for MIPS (successful), change back to master, then build for MIPS again, it does not raise the error. Perhaps something is not being cleaned up properly ?

• Graph-based video processing for .NET

  23 octobre 2016, par Borv

  Does anyone know a good object-oriented library (preferably high-level, like C# or Java) for working with video and audio streams ?

  I wrote an app which fiddles with video and audio streams, feeds and such. The original task was simple :

  • grab an RTSP feed
  • display original feed(s) on the display
  • convert it to a series of h264 ts files
  • extract audio into separate MP3 files
  • upload videos and audio to the web site (preferably in real time, few minute delay is acceptable)

  As you may have already guessed it is about recording events (e.g. lectures) and publishing them on the web.

  To pull this out I needed some graph-based non-linear editing for media. Two weeks in, I tried ffmpeg, vlc and WMF. The only library I got to work is ffmpeg, and that comes with lots of "however". WMF required a lot of coding (and I abandoned this path), vlc looked great on paper, but I stumbled across some bugs with input splitting I could not get around (e.g. transcode:es combination flat out refused to work).

  So, the question. What are good non-linear editing libraries besides ffmpeg, vlc and wmf/directshow that allow for building video processing graphs with sources, sinks and filters ? Or perhaps good bindings over ffmpeg and vlc allowing to build such graphs ?