Hello,
I am trying to build ffmpeg using the build setup
https://github.com/Kagami/ffmpeg.js which uses Emscripten. It is supposed
to target JavaScript, not Web Assembly, and uses -s WASM=0 to make that
switch. However, eventually the make script encounters this error:
$ make ffmpeg-webm.js
emcc build/ffmpeg-webm/ffmpeg.bc build/opus/dist/lib/libopus.so
build/libvpx/dist/lib/libvpx.so \
--post-js build/post-sync.js \
-O3 --closure 1 --memory-init-file 0 -s WASM=0 -s
WASM_ASYNC_COMPILATION=0 -s ASSERTIONS=0 -s EXIT_RUNTIME=1 -s
NODEJS_CATCH_EXIT=0 -s NODEJS_CATCH_REJECTION=0 -s TOTAL_MEMORY=67108864
-lnodefs.js -lworkerfs.js --pre-js build/pre.js -o ffmpeg-webm.js
wasm-ld: error: unknown file type: build/ffmpeg-webm/ffmpeg.bc
emcc: error: '/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/bin/wasm-ld
-o ffmpeg-webm.wasm build/ffmpeg-webm/ffmpeg.bc
build/opus/dist/lib/libopus.so build/libvpx/dist/lib/libvpx.so
-L/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libc.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libcompiler_rt.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libc++-noexcept.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libc++abi-noexcept.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libdlmalloc.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libpthread_stub.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libc_rt_wasm.a
/mnt/c/Users/erisco/Documents/cpp/emsdk/upstream/emscripten/cache/wasm/libsockets.a
-mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj
-mllvm -disable-lsr --allow-undefined --import-memory --strip-debug
--export-table --export main --export stackSave --export stackRestore
--export stackAlloc --export __wasm_call_ctors --export fflush --export
__errno_location --export malloc --export free --export setThrew --export
realloc --export testSetjmp --export saveSetjmp -z stack-size=5242880
--initial-memory=67108864 --no-entry --max-memory=67108864
--global-base=1024' failed (1)
Makefile:233: recipe for target 'ffmpeg-webm.js' failed
make: *** [ffmpeg-webm.js] Error 1
It seems as though -s WASM=0 is having no effect because I would not expect
wasm-ld to be called at all, and definitely not on ffmpeg.bc (which is a
JavaScript file).
Anyone have some advice for this?
Thanks,
Eric
P.S. I also have this issue open on the ffmpeg.js tracker, as perhaps it is
a problem with the build script:
https://github.com/Kagami/ffmpeg.js/issues/148
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