Instructions on building WAMS ffmpeg.

[PaulKinlan]

Super quick question. Do you have instructions on how you built with WASM support?

I love this demo, but I am seeing a huge perf impact on WASM in Chrome vs ASM.js and I'd like to dive into it more.

[jonasof]

The code is on "webassembly" branch on my fork of videoconverter.js - https://github.com/jonasof/videoconverter.js/tree/webassembly

For more information see the original issue on videoconverter.js: bgrins/videoconverter.js#43 and pull request bgrins/videoconverter.js#63.

Basically to build WASM version you need the "income" version of emscripten and change one line of build_lgpl.sh. See the pull request and commit jonasof/videoconverter.js@cd5de5f. Note that my code also uses the pull request bgrins/videoconverter.js#55 which is not merged in current master branch of videoconverter.js.

[picitujeromanov]

it's not possible to compile with all codecs

[Superfantastisch]

@picitujeromanov - Try to update to FFmpeg version 3.3. This solved my problem.

• Unknown encoder 'libx264' #2

[picitujeromanov]

I'm actually crashing on 'endian test failed' by emconfigure ./configure --disable-thread --disable-asm \ --host=i686-pc-linux-gnu \ --disable-cli --enable-static --disable-gpl --prefix=$(pwd)/../dist