Importing X and exporting to FBX gives only 2 animation keyframes?

[aoqia194]

I figure I am doing something wrong yet again, but I thought I'd ask the people of assimp since I have never used this before. I simply want to convert a DirectX .X file to a .FBX file. The .X file contains animation data with some bone stuff.

I am pretty sure assimp has no problems whatsoever with importing, it's mainly the exporting part:
Assimp isn't complaining when I check it's log, and everything seems to be exporting fine. But when you try and open the resulting FBX inside of a animation software like Blender, there's only the first and last keyframes shown, and it seems like none of the nodes that assimp correctly imported got exported (that or Blender is just wrong?).

Any advice would be great, I'd even fix this if it were a bug. But I don't know if it's a bug or something I am doing.

My code:

const aiScene *scene = importer.ReadFile(in_file_str, aiProcess_ValidateDataStructure);
if (scene == nullptr || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE) {
    spdlog::critical("Failed to load asset at {}", in_file_str);
    spdlog::critical("{}", importer.GetErrorString());
    return 1;
}

const auto out_file = out_dir / relative(in_file_str, fix_assets ? fixed_assets_dir : asset_dir).
    replace_extension("." EXPORT_EXTENSION);
create_directories(out_file.parent_path());

spdlog::info("Exporting asset scene to {}", out_file.string());
auto res = exporter.Export(scene, EXPORT_EXTENSION, out_file.string(), aiProcess_ValidateDataStructure);
if (res != AI_SUCCESS) {
    spdlog::error("Failed to export scene.");
}

Imported X file: https://www.mediafire.com/file/knfd1cget8y3gty/Bob_DrinkFromBottle.X/file

[aoqia194]

I figured it out after I built a little imgui demo to view what assimp was loading. Turns out the FBX exporter is broken. Will raise an issue soon.