Passing jpg filenames to ffmpeg is actually quite bad. This causes all
jpg images (at least in my testing) to be probed as image2 which is
blacklisted in demux_lavf since it's completely broken (see commit
74e62ed2d1 for some details). What happens
in practice is that the lavf demxuer fails and the it opens in the mf
demuxer instead. This is OK for simple viewing, but because that demuxer
is limited, many specific file properities and other things are
completely unavailable which breaks any script that may depend on them
(e.g. width, height, etc.) For the small subset of files that this
commit appeared to "fix" (in reality, it just fell back to the mf
demuxer) is not worth breaking property usage in the vast majority of
normal proper files. Ideally ffmpeg should fix this but some other
workaround on our end can be used instead.
This reverts commit d0aeca5918.
a900d41b1e