Gemini silently "failing" if audio can't be extracted from video container

CREMA-D has several videos in an .flv container. Gemini 2.5 Flash Lite supports both x-flv and .mp3 codecs which are inside the container. If I strip out the video and audio data individually, Gemini is able to ingest both files. However, if pass in the .flv file without any modification, it can ingest the video but it says there is no audio.

Maybe it is controversial to say this is a “failure” but if a video has an audio track and Gemini can not read it, should we not get some type of warning or error?