More work

packages/prores-decoder/README.md

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+```bash
+emmake make distclean
+
+emconfigure ./configure \
+    --target-os=none \
+    --arch=x86_32 \
+    --enable-cross-compile \
+    --disable-asm \
+    --disable-x86asm \
+    --disable-inline-asm \
+    --disable-stripping \
+    --disable-programs \
+    --disable-doc \
+    --disable-debug \
+    --disable-all \
+    --disable-everything \
+    --disable-pthreads \
+    --enable-avcodec \
+    --enable-decoder=prores \
+    --cc="emcc" \
+    --cxx=em++ \
+    --ar=emar \
+    --ranlib=emranlib \
+    --extra-cflags="-DNDEBUG -O3 -msimd128"
+
+emmake make
+```
+
+```bash
+export FFMPEG_PATH=/path/to/ffmpeg
+
+emcc src/bridge.c \
+    $FFMPEG_PATH/libavcodec/libavcodec.a \
+    $FFMPEG_PATH/libavutil/libavutil.a \
+    -I$FFMPEG_PATH \
+    -s MODULARIZE=1 \
+    -s EXPORT_ES6=1 \
+    -s SINGLE_FILE=1 \
+    -s ALLOW_MEMORY_GROWTH=1 \
+    -s ENVIRONMENT=web,worker \
+    -s EXPORTED_RUNTIME_METHODS=cwrap,HEAPU8 \
+    -s EXPORTED_FUNCTIONS=_malloc,_free \
+    -msimd128 \
+    -O3 \
+    -o build/prores.js
+```