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• avfilter/fifo : use the name 's' for the pointer to the private context

  28 septembre 2019, par Paul B Mahol

  avfilter/fifo : use the name 's' for the pointer to the private context
  This is shorter and consistent across filters.
  

  • [DH] libavfilter/fifo.c

• ffmpeg configure always returns "not found" when using sysroot and cross-prefix options - how to use them correctly ?

  5 août 2014, par user2212461

  I try to build ffmpeg with a cross-compiler. When setting the configure flags I am getting the following errors :

  WARNING: Compiler does not indicate floating-point ABI, guessing soft.
  
  build_it.sh: 29: build_it.sh: --sysroot=/home/android/android-ndk-r9/platforms/
  
      android-9/arch-arm/: not found
  
  build_it.sh: 32: build_it.sh.sh: --cross-prefix=/home/android/android-ndk-r9/
  
      toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-and
  
      roideabi-: not found

  The error message "not found" sounds like the paths dont exist but they are all correct and existing. How can I resolve this error ?

  build_it.sh :

  NDK=/home/android/android-ndk-r9
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86
  
  CPU=arm
  
  PREFIX=test
  
  ADDI_CFLAGS="-marm"
  
  platform="android-9"
  
  
  
  ./configure \
  
      --disable-asm \
  
      --enable-shared \
  
      --target-os=linux \
  
      --arch=arm \
  
      --enable-cross-compile \
  
      --disable-static \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
      --extra-ldflags="$ADDI_LDFLAGS"
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
      --prefix=$PREFIX \
  
  
  
  ##configure fails here
  
  ...

• Export .osp OpenShot project to ffmpeg script as workaround to video export freeze or crash by swap hell

  30 août 2018, par 1000i100

  I have a big video rush 35".

  With OpenShot i’ve cut more than 30 small sequences and concatenate them into one 25" sequence.

  Now i try to export the result as video file but OneShot randomly crash or freeze during the export/encoding between 40% and 80% so after more than an hour of encoding. It look to be a memory leek and a swap saturation with memory allocation deny because no space left.

  I’ve tried with x264(mp4) and vp8(webm) encoding, but nothing worked.

  I’ve opened the .osp file, it’s a big json file with all the clips referred like this :

  {
  
    clips:[
  
      {
  
        title: "",
  
        start:<seconds>.<decimals>,
  
        end:<seconds>.<decimals>,
  
        position:<seconds>.<decimals>
  
      }
  
    ]
  
  }
  
  </decimals></seconds></decimals></seconds></decimals></seconds>

  • title if not renamed is the inputFileName.
  • start clip start time from the input file beginning
  • end clip end time from the input file beginning
  • position clip start position in the output file timeline

  I’ve read ffmpeg can extract video parts / subclip / sequences with cut function :

  ffmpeg -ss 00:00:09.000 -i input.mp4 -to 00:00:20 output.mp4

  Time can be hh:mm:ss.xxx or hh:mm:ss or any amount of seconds, allowing decimals.

  I’ve also read ffmpeg can concat sequences :

  ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" output.ts

  So, how to encode my video with these project data ?