Bus Error

[wesbos]

Hello, thank you for this library.

I'm having an issue with the following code in Node.js v20.1.0, but also appears on LTS v18.17.0

test.js:

import { FFmpeg } from "@ffmpeg.wasm/main";
const ffmpeg = await FFmpeg.create()

running node test.js I get "bus error".

I'm not able to catch any errors, nor see whats causing this. Any idea how to debug?

package.json:

{
  "name": "ffmpeg-delete-me",
  "version": "0.0.1",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "Wes Bos (https://wesbos.com/)",
  "license": "MIT",
  "dependencies": {
    "@ffmpeg.wasm/core-mt": "^0.13.2",
    "@ffmpeg.wasm/main": "^0.13.0"
  },
  "type": "module"
}

[wesbos]

Seems to be happening when requiring the core in importCore function. Both core-mt and core-st create a bus error

[wesbos]

Dug a bit deeper - its this line:

      let core = yield (yield importCore(options.core, logger))({
        arguments: VERSION_ARGS,

VERSION_ARGS is ["ffmpeg", "-version"] and I guess when it runs that, it chokes? Replacing it with ["echo", "hello"] still breaks, so when the command is run its throwing a bus error

[wesbos]

Reverting the core to "@ffmpeg.wasm/core-mt": "0.12.0", seems to not be throwing the error. Still on latest for the main package.

[wesbos]

Sorry for all the comments. They don't seem to work together. this.core._free is not a function

[DreamOfIce]

You can add log: true to the options of FFmpeg.create(), this should log some useful information

[wesbos]

I tried that,this code:

import { FFmpeg } from "@ffmpeg.wasm/main"
const ffmpeg = FFmpeg.create({
  log: true,
  logger: (level, message) => console.log(level, message),
});

Gives me:

node test.js
debug Import '@ffmpeg.wasm/core-mt' with cjs require()
[1]    39199 bus error  node test.js

[DreamOfIce]

Cloud you provide a more detailed system and environment info?
I can't reproduce this problem with nodejs v18.17.0 under Windows10 or Debian12.

[wesbos]

Macbook Pro, 2021 Apple M1 Max.

Node v18.17.0
npm 9.6.7

    "@ffmpeg.wasm/core-mt": "0.13.2",
    "@ffmpeg.wasm/core-st": "0.13.2",
    "@ffmpeg.wasm/main": "0.13.0"

I tried to replicate it here, but it does work. So maybe it's an apple silicon issue? https://codesandbox.io/p/sandbox/jolly-mccarthy-pmw9gd?file=%2Findex.js%3A8%2C1

[wesbos]

I'm collecting data over here: wesbos/ff-me#1

So far it seems to happen only on Mac OS, both intel and silicon chips.

[evayde]

The tests of the project also fail on Mac. Same error message.

[DreamOfIce]

Have you tried core-st? Will there still be the same error?

[DreamOfIce]

You can clone DreamOfIce/ffmpeg.wasm-core and uncomment this line:

https://github.com/DreamOfIce/ffmpeg.wasm-core/blob/6690593aa6b014dad266efa97293e32d27499c0c/wasm/bu ild-scripts/var.sh#L32

Then run ./build.sh to build debug version of the core.

Switch to the local core through pnpm add -D /path/to/ffmpeg.wasm-core /packages/core-mt/.

Then run the test again, and you should be able to see more detailed output.

[DreamOfIce]

It looks like this issue has been fixed in the latest v20.5.0
But not yet fixed in v18.17.0 LTS
wesbos/ff-me#1 (comment)

[evayde]

It looks like this issue has been fixed in the latest v20.5.0 But not yet fixed in v18.17.0 LTS wesbos/ff-me#1 (comment)

Confirmed! This issue doesn't exist in Node 20.5.0 on Mac

[wesbos]

looks like it's working on 20.5.0 - thank you everyone!