Hi, it's amazing for emscripten build c/c++ program to wasm, and run at a
website !
Recently, I try to emcc build ffprobe.bc to ffprobe.wasm, there output two
file : ffprobe.js and ffprobe.wasm
the ffprobe.js is a bridge to fetch and compile ffprobe.wasm, and run it by
WebAssembly Api at browsers Web Worker
I use emcc --pre-js --post-js to set my custom change in ffprobe.js
emcc \
-s EXIT_RUNTIME=0 \
-s ENVIRONMENT=worker \
-s WASM=1 \
--pre-js pre.js \
--post-js post.js \
-o ffprobe.js \
ffprobe.bc && \
My Question Below:
If I wrapped the compiled code by a function, and work it on Web Worker, it
works good.
But when run the function multiple, fetch and init ffprobe.wasm will call
multiple. (its slow...)
I try to find a way to just re run the compiled binary.
So I change the code，to re run() multiple，below is what I do at my Web
Worker onmessage function :
self.onmessage = function (e) {
- set noIntialRun: true
- set Module['calledRun'] = false
- set shouldRunNow = true
- call Module['run'](e.data.arguments)
}
> -------------------------------------------------------------- <
The result is
- if i just call arguments = ["-version"], it works well at any times I
call the function
- if i do the FS usage，like arguments = ["-v", "error",
"-select_streams", "v:0", "-show_entries", "stream=width,height", "-of",
"csv=s=x:p=0", "/my_data/test_1.flv"]，this output the video metainfo width
and height. it works well at first call, and the second time , stderr: Argument
'/my_data/test2.flv' provided as input filename, but '/my_data/test1.flv'
was already specified.
The error reason is:
when call run(arguments) at the second time, the arguments have
double length (the old args concat the new args), just like "ffprobe
-version -version" ("-version -version" command can work well. but the FS
usage double length will throw the error -- same behavior at terminal when
ffprobe double -i file)
is there a way to "RESET arguments" ?
can someone help me ... thx all !
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