How-to: cross-compile ffmpeg for readynas sparc

Just to say, I also recently cross-compiled ffmpeg for my sparc ReadyNas Duo. If someone is looking for a snapshot version that compiles and runs on 4.1.7, I used version 0.10.2. I ran:

./configure --arch=sparc --enable-cross-compile --cross-prefix=sparc-linux- --cpu=v8 --target-os=linux
make

I also made the CPU edit in the configure script referred to above in order to support the v8 processer, though the line numbers were of course different. In addition, I also added "disable vis" in the same place (this is a v9 instruction set):

case $cpu in
niagara|v8|v7)
cpuflags="-mcpu=$cpu"
disable vis
;;
sparc64)
cpuflags="-mcpu=v9"
;;
esac

There is no need to symlink the cross-compiler tools, the configure script should pick them up automatically with the above arguments. You can check the architecture of the built binary following "make" using "file".

I have now set up a cron job to automatically remux MKVs to MP4s (well, M4V actually) so they can be streamed to my PS3:
ffmpeg -loglevel error -i foo.mkv -vcodec copy -acodec copy foo.m4v
Seems to work! I find MP4 the best format for HD videos without subtitles, as contrary to popular belief they -do- now support AC3 audio tracks, so no re-encoding required.

(To go off on a tangent:, the "niagara"" section was already in the configure script in 0,10.2, though I was surprised to see "disable vis" here since I thought niagara did support v9 instruction sets. Probably something to do with the compiler.)