How was avc.wasm file generated with emscripten 1.35.12?

[blazvizjak]

My endgame is increasing TOTAL_MEMORY in make.py, but I've hit several obstacles.

In README.md it states "The current version of Broadway was built with emscripten 1.35.12" is this correct?

I've installed emsdk and installed emscripten-tag-1.35.12-64bit and fastcomp-clang-tag-e1.35.12-64bit but there is no binaryen prior to 1.36.12 so I'm wandering if there is something missing in your commit when you've added webassembly support.

Any kind of insight on how to install correct version of emscripten for "python make.py" to work and also generate avc.wasm file would be appreciated.

[soliton4]

sorry the readme is likely outdated.
my goal is always to use the latest version of emscripten. so try that. if you run into trouble i may be able to help

[SoylentGraham]

Do we know what version of emscripten IS good?
I've just installed via official guide (on mac) 2.0.14 and it seems like the new version doesn't make a ~/.emscripten file, I think?

Possibly my setup is wrong, but I just can't get emscripten to generate this file, but I don't know if this is just out of date (given the major version change)

Traceback (most recent call last):
  File "./make.py", line 6, in <module>
    exec(open(os.path.expanduser('~/.emscripten'), 'r').read())
IOError: [Errno 2] No such file or directory: '/Users/graham/.emscripten'

I'm also trying to setup an action with the same setup
https://github.com/SoylentGraham/Broadway/runs/1973463000?check_suite_focus=true

But, I don't know if I'm working with the wrong version etc

[SoylentGraham]

https://emscripten.org/docs/introducing_emscripten/release_notes.html
Your comment is 13th may, so that should be 1.39.15: 05/06/2020

[SoylentGraham]

I think I'm not setting up emscripten correctly in some way (emcc works though), switched to 1.39.15 and have the same problem. Same error via github action.

[SoylentGraham]

Compiling directly with emscipten/emcc is okay, my setup just doesn't seem happy with the python script;
https://github.com/NewChromantics/PopH264/blob/master/PopH264.Emscripten/Build.sh#L117

[SoylentGraham]

@myjimmy the build script is in the post above your one.
That has all the instructions on how I build broadway to wasm in my project.

[soliton4]

@SoylentGraham why not make a pr?
im not very happy with the state of the build scripts, but i also dont have the time and motivation to make them all pretty.
but if you do pls contribute

[SoylentGraham]

Being a basic bash script is a wild diversion from your python script, with no features, not very crossplatform... and I couldn't really see why the python one wouldn't work (outside of normal python2/3 dependency mess), so wasn't sure if it was just my setup, rather than a fault with your scripts. (still not sure :)

Mine's not even a build script, (it's just a one-liner really) but integrates with my systems better

[SoylentGraham]

I'm afraid I have no idea what's causing that error; (and don't really have the time to debug it)
Googling the error gives a lot of results of other people having the same problem

Note; 00 61 73 6d is \0asm and the expected hex 77 61 73 6d is wasm

Open your .wasm output file in a hex editor and see if that's correct, to make sure it's not your webserver zero'ing the first byte

Your script has a load of options I don't have, all I can suggest is cutting it way back and remove as many options until it works. That's kinda what I did.

If you're just trying to decode h264 on web though, (and not supporting every browser under the sun) you may want to look into webcodecs. It's hardware accellerated, it's an ultra basic API, and will be enabled in the next chrome release by default