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• 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 ?

• AAC encoder : don’t apply MS on special bands

  8 janvier 2016, par Claudio Freire

  AAC encoder : don’t apply MS on special bands
  Change the condition for application of the M/S transform to match
  
  that of the decoder. Namely, that no special coding books must be
  
  in use in either channel. While the condition ought to be
  
  equivalent to the current one when the invariant of is_mask is
  
  kept, matching the decoder’s condition is safer and easier to
  
  maintain.
  

  • [DH] libavcodec/aacenc.c

• ffmpeg add two subtitle files to the same mp4

  1er février 2016, par Jay Len

  I have two subtitle tracks files : spanish.ass and english.ass. I want to insert them into an mp4. I can do one or the other but not both.

  I am using :

  ffmpeg -i Clean.mp4 -i spanish.ass -c:s mov_text -c:v copy -c:a copy -metadata:s:s:0 language=spa With1CC.mp4

  and then

  ffmpeg -i With1CC.mp4 -i english.ass -c:s mov_text -c:v copy -c:a copy -metadata:s:s:0 language=eng With2CC.mp4

  ...but while the first statement successfully inserts the Spanish subtitles, the second just changes the visual name of the track to read English. The actual English track is not actually inserted as a second track