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POX264 & ARM encoding on Android
 

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  1. POX264 & ARM encoding on Android
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    <p>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.</p> <p>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:</p> <pre><code>./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 \ </code></pre> <p>I believe the last line should so what I am after ie enable ARM optimisations. Maybe I am missing something.</p> <p>For info I am encoding a 640x480 video on a Nexus 7 tablet. Here are my encoder settings (x264)</p> <pre><code>c-&gt;gop_size = 12; c-&gt;pix_fmt = PIX_FMT_YUV420P; c-&gt;max_b_frames = 0; c-&gt;scenechange_threshold = 0; c-&gt;rc_buffer_size = 0; </code></pre> <p>Thanks</p>
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    1. COThe built in Media Recorder will be using a hardware encoder, optimized and built for the chip on the phone. What resolution video are you encoding? 1 frame/1 sec seems very slow! Also, you have to post more details about the processor capability of the device that you are testing this on.
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    2. COThanks for your reply! Added those details in the original post
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    3. COI am not familiar with development on Android and I am not sure how mush access you have to the internal drivers, If you can find the driver that handles recording from the camera, your best bet would be to feed the video through it. Most Video apps transcode videos on server side.
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