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• aac : move the TNS tables from aacdectab to the shared aactab

  29 août 2015, par Rostislav Pehlivanov

  aac : move the TNS tables from aacdectab to the shared aactab
  This commit simply moves the TNS tables to a more appropriate
  
  aactab.h since then they can be accessed by both the decoder
  
  and encoder.
  The encoder _shouldn’t_ normally need the tables since the
  
  specs describe a specific quantization process, but the exact
  
  reason for this can be seen in the TNS commit following.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aacdectab.h
  • [DH] libavcodec/aactab.h

• Fix motion blur in still frames from mpeg2video

  14 mars 2017, par Bird

  I’m extracting still frames from a video using the basic code :

  ffmpeg -i video.MXF -vf fps=1 output_%04d.png  

  In some videos, this yields images that, when the camera was moving, look much blurrier than when watching the video (see example below). The still frames from when the camera was not moving look sharper (closer to how it looks in video playback).

  The video specs are : mpeg2video, yuv422p, 1280x720 (according to FFprobe).

  Is this inherent within the video coding or structure ? The video looks so nice when in motion, but even when I pause in VLC the frame goes from sharp to blurred.

  Are there any additions to my FFmpeg code that could result in sharper images ? I tried adding a yadif filter, but it made no difference (the video isn’t interlaced anyways).

  Unfortunately I can’t post a video sample online, but below is an example of a sharper image and a blurry image ; both look in focus during video playback and are about a second apart in the video (that’s the same orange sea star on the left side).

  
  

• How to solve this situation about ffmpeg with Android NDK

  13 décembre 2013, par Terry-Liu

  I used Android NDK to Compile ffmpeg ，when I run config.sh,so many erros happened,how to solve it.

  Terry-L@Terry-L-HP /cygdrive/e/Android/android-ndk-r8d/samples/FFmpeg/jni/ffmpeg
  
  $ ./config.sh
  
  
  
  Unknown option "".
  
  See ./configure --help for available options.
  
  ./config.sh: line 6: --target-os=linux: command not found
  
  ./config.sh: line 7: --arch=arm: command not found
  
  ./config.sh: line 8: --enable-version3: command not found
  
  ./config.sh: line 9: --enable-gpl: command not found
  
  ./config.sh: line 10: --enable-nonfree: command not found
  
  ./config.sh: line 11: --disable-stripping: command not found
  
  ./config.sh: line 12: --disable-ffmpeg: command not found
  
  ./config.sh: line 13: --disable-ffplay: command not found
  
  ./config.sh: line 14: --disable-ffserver: command not found
  
  ./config.sh: line 15: --disable-ffprobe: command not found
  
  ./config.sh: line 16: --disable-encoders: command not found
  
  ./config.sh: line 17: --disable-muxers: command not found
  
  ./config.sh: line 18: --disable-devices: command not found
  
  ./config.sh: line 19: --disable-protocols: command not found
  
  ./config.sh: line 20: --enable-protocol=file: command not found
  
  ./config.sh: line 21: --enable-avfilter: command not found
  
  ./config.sh: line 22: --disable-network: command not found
  
  ./config.sh: line 23: --disable-mpegaudio-hp: command not found
  
  ./config.sh: line 24: --disable-avdevice: command not found
  
  ./config.sh: line 25: --enable-cross-compile: command not found
  
  ./config.sh: line 26: --cc=/cygdrive/e/Android/android-ndk-r8d/toolchains/arm-li                                                                                                                nux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi-gcc: No such file                                                                                                                 or directory
  
  ./config.sh: line 27: --cross-prefix=/cygdrive/e/Android/android-ndk-r8d/toolcha                                                                                                                ins/arm-linux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi-: No su                                                                                                                ch file or directory
  
  ./config.sh: line 28: --nm=/cygdrive/e/Android/android-ndk-r8d/toolchains/arm-li                                                                                                                nux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi-nm: No such file                                                                                                                 or directory
  
  ./config.sh: line 29: --extra-cflags=-fPIC -DANDROID: command not found
  
  ./config.sh: line 30: --disable-asm: command not found
  
  ./config.sh: line 31: --enable-neon: command not found
  
  ./config.sh: line 32: --enable-armv5te: command not found
  
  ./config.sh: line 33: --extra-ldflags=-Wl,-T,/cygdrive/e/Android/android-ndk-r8d                                                                                                            

  /toolchains/arm-linux-androideabi-4.6/prebuilt/windows/arm-linux-androideabi/lib /ldscripts/armelf_linux_eabi.x -Wl,-rpath-link=/cygdrive/e/Android/android-ndk-r 8d/platforms/android-14/arch-arm/usr/lib -L/cygdrive/e/Android/android-ndk-r8d/p latforms/android-14/arch-arm/usr/lib -nostdlib /cygdrive/e/Android/android-ndk-r 8d/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/lib/gcc/arm-linux-andro ideabi/4.6/crtbegin.o /cygdrive/e/Android/android-ndk-r8d/toolchains/arm-linux-a ndroideabi-4.6/prebuilt/windows/lib/gcc/arm-linux-androideabi/4.6/crtend.o -lc - lm -ldl : No such file or directory