When I try : /home/gjy/ndk/android-ndk-r16b-linux-x86_64/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-as -fPIC -c -o /tmp/ffconf.jHtqLsFE/test.o /tmp/ffconf.jHtqLsFE/test.

Download FFmpeg source code, and build it as follows. sudo apt-get install git make nasm pkg-config libx264-dev libxext-dev libxfixes-dev zlib1g-dev. Here is how to compile and install FFmpeg on Ubuntu or Debian. It seems like that the frist char was ignored. If you want to install the original FFmpeg on Ubuntu or Debian, one way is to compile it yourself. When finished, you'll have FFmpeg with support for the following: NVIDIA NVENC (NVIDIA H/W Fixed Function video encoder for h. The tasks must be completed in the order that they appear. GNU assembler not found, install/update gas-preprocessor FFmpeg with Ubuntu Linux (from 14.04 on). home/gjy/ndk/android-ndk-r16b-linux-x86_64/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-as: invalid option - '_' Then I get error form config.log : /home/gjy/ndk/android-ndk-r16b-linux-x86_64/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-as -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -fPIE -fPIC -ffast-math -funroll-loops -mfloat-abi=softfp -mfpu=vfpv3-d16 -mcpu=armeabi -fPIC -c -o /tmp/ffconf.hfTGr6sO/test.o /tmp/ffconf.hfTGr6sO/test.S here is my build script,and it works well.

I want to compile FFmpeg with clang as it's more faster,but I don't know how to do it in ubuntu.

Compile ffmpeg ubuntu