Clarify supported video formats

[Beep6581]

The Meshroom manual is very vague regarding supported video formats: https://meshroom-manual.readthedocs.io/en/latest/feature-documentation/core/supported-formats.html?highlight=video

Video File formats .avi’, ‘.mov’, ‘.qt’, ‘.mkv’, ‘.webm’, ‘.mp4’, ‘.mpg’, ‘.mpeg’, ‘.m2v’, ‘.m4v’, ‘.wmv’, ‘.ogv’, ‘.ogg’, ‘.mxf’

Strictly speaking, those are container formats, not video formats. "mp4" could contain a wide variety of formats.

An exhaustive list of supported video formats would be unnecessary and unrealistic, but just a mention of the most common ones would help, e.g.: H.264, H.264, VP9.

Alternatively, a way to get Meshroom to list supported video formats in the current build.

[natowi]

Yes, "Supported video file extensions" might be a more precise title.

I took a quick look at the AliceVision code. It looks like ffmpeg is used through opencv to read video files.

[Beep6581]

ffmpeg allows one to list the codecs and formats supported in a build using ffmpeg -codecs and ffmpeg -formats. If it's possible to query a meshroom exe or appimage for that info, that would be great, and should be documented.

The reason I asked for this is that while troubleshooting the other issues I opened regarding video import, it would have been great to know that I'm at least using a video file in a supported format.

[fabiencastan]

To do that, we need to find a way to do it from the opencv/ffmpeg api.

[stale[bot]]

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