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• aacenc_tns : implement temporal noise shaping

  21 août 2015, par Rostislav Pehlivanov

  aacenc_tns : implement temporal noise shaping
  This commit implements temporal noise shaping support in the
  
  encoder, along with an -aac_tns option to toggle it on or off
  
  (off by default for now). TNS will increase audio quality
  
  and reduce quantization noise by applying a multitap FIR filter
  
  across allowed coefficients and transmit side information to the
  
  decoder so it could create an inverse filter.
  Users are encouraged to test the new functionality by enabling
  
   aac_tns 1 during encoding.
  No major bugs are observable at this time so after a while if no
  
  new problems appear and if the current implementation is deemed
  
  of high enough quality and stability it will be enabled by default,
  
  possibly at the same time the encoder has its experimental flag
  
  removed and becomes the standard aac encoder in ffmpeg.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/aac.h
  • [DH] libavcodec/aaccoder.c
  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc.h
  • [DH] libavcodec/aacenc_tns.c
  • [DH] libavcodec/aacenc_tns.h

• Merge commit ’ebfe622bb1ca57cecb932e42926745cba7161913’

  9 janvier 2014, par Michael Niedermayer

  Merge commit ’ebfe622bb1ca57cecb932e42926745cba7161913’
  * commit ’ebfe622bb1ca57cecb932e42926745cba7161913’ :
  
    mpegvideo : drop support for real (non-emulated) edges
  Conflicts :
  
  	libavcodec/mpegvideo.c
  
  	libavcodec/mpegvideo_motion.c
  
  	libavcodec/wmv2.c
  If this is slower on a major platform then it should be investigated
  
  and potentially reverted.
  See : 8fc52a5ef94712d900fc8fe7503cf9c9ba635143
  
  See : 3969b4b861ce8152e3195e8f8c3437abd273b90a
  
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/mpegvideo.c
  • [DH] libavcodec/mpegvideo.h
  • [DH] libavcodec/mpegvideo_enc.c
  • [DH] libavcodec/mpegvideo_motion.c
  • [DH] libavcodec/mss2.c
  • [DH] libavcodec/rv34.c
  • [DH] libavcodec/svq3.c
  • [DH] libavcodec/vc1dec.c
  • [DH] libavcodec/wmv2.c

• Building FFMPEG library for iOS5.1 ARMv7

  25 octobre 2012, par Jimmy

  I'm trying to use the FFMPEG library in an XCode 4.5.1 project. And I'm trying to build it for ARMv7

  But I'm running into some major issues, I'm hoping that someone can walk me through how to do it ? I feel a little sketched out reading material thats a couple months old. I'm not aware of the changes.

  New Update (after a lot of time)

  I want to help everyone out that is having this problem because its so frustrating. heres how you do it. I've pasted the configuration stage. This is my ./configure

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-cross-compile --arch=arm --target-os=darwin
  
     --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  
     --as='gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2'
  
     --sysroot=/applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  
     --cpu=cortex-a8
  
     --extra-ldflags='-isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk'
  
     --enable-pic
  
     --disable-bzlib --disable-gpl --disable-shared --enable-static --disable-mmx --disable-debug --disable-neon
  
     --extra-cflags='-pipe -Os -gdwarf-2 -isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} -mthumb-interwork'

  This ended up working for me. I had the following problems.

  • I had to download ( https://github.com/yuvi/gas-preprocessor ) copy the file gas-preprocessor.pl at /usr/local/bin. Set permissions to read write (777)
  • Make sure I'm using the right GCC compiler : /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  • Make sure I'm using the right SDK : /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  • —extra-cflags="-arch armv7" causes bugs in the configure. take it out. This was causing my gcc compile errors. (specifically this one : error : unrecognized command line option “-arch”.)

  I'll let you guys know how much further I get.