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• Android video conversion [on hold]

  28 octobre 2013, par Jeffrey Grima

  I am a student who is doing his bachelors degree thesis. I need to implement a mobile application to convert video files from one format to another and also using a mobile service to do the same thing and compare how long did it take to perform the same tests but with different approaches.

  After doing some research on how to implement the conversion on the mobile application I have only found FFMpeg. I would like to know if any of you guys have in mind like other video converting API`s for android or something that i should consider before submitting my proposal.

• X264 & ARM encoding on Android

  20 janvier 2013, par Tishu

  I recently built a Video encoding class that runs on Android using ffmpeg and native code. I am surprised by the time it takes to encode a video, about 1 frame / second at best. I have tried with x264 and settings optimised for speed and with mpeg as well - no real difference.

  The x264 library now has support for ARM architecture and is meant to be quite efficient on these boasting over 20fps encoding speed. I am not sure I am using it correctly. Here the script I use for compiling :

  ./configure --prefix=$PREFIX \
  
  --enable-shared \
  
  --enable-static \
  
  --disable-gpac \
  
  --enable-debug \
  
  --extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -msoft-float -mthumb -O3 -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -MMD -MP " \
  
  --extra-ldflags=" -nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/usr/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -lc -lm -ldl -lgcc" \
  
  --cross-prefix=${ARM_PRE}- \
  
  --disable-asm \
  
  --host=arm-linux \

  I believe the last line should so what I am after ie enable ARM optimisations. Maybe I am missing something.

  For info I am encoding a 640x480 video on a Nexus 7 tablet. Here are my encoder settings (x264)

  c->gop_size       = 12;
  
  c->pix_fmt        = PIX_FMT_YUV420P;
  
  c->max_b_frames   = 0;
  
  c->scenechange_threshold = 0;
  
  c->rc_buffer_size = 0;

  Thanks

• X264 & ARM encoding on Android

  20 janvier 2013, par Tishu

  I recently built a Video encoding class that runs on Android using ffmpeg and native code. I am surprised by the time it takes to encode a video, about 1 frame / second at best. I have tried with x264 and settings optimised for speed and with mpeg as well - no real difference.

  The x264 library now has support for ARM architecture and is meant to be quite efficient on these boasting over 20fps encoding speed. I am not sure I am using it correctly. Here the script I use for compiling :

  ./configure --prefix=$PREFIX \
  
  --enable-shared \
  
  --enable-static \
  
  --disable-gpac \
  
  --enable-debug \
  
  --extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -msoft-float -mthumb -O3 -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -MMD -MP " \
  
  --extra-ldflags=" -nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/usr/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -lc -lm -ldl -lgcc" \
  
  --cross-prefix=${ARM_PRE}- \
  
  --disable-asm \
  
  --host=arm-linux \

  I believe the last line should so what I am after ie enable ARM optimisations. Maybe I am missing something.

  For info I am encoding a 640x480 video on a Nexus 7 tablet. Here are my encoder settings (x264)

  c->gop_size       = 12;
  
  c->pix_fmt        = PIX_FMT_YUV420P;
  
  c->max_b_frames   = 0;
  
  c->scenechange_threshold = 0;
  
  c->rc_buffer_size = 0;

  Thanks