stream.ffmpegmux: cache executable lookups #4660
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- Remove redundant commands with `.exe` suffixes. `shutil.which` will pick those up via `PATHEXT` on Windows. - Move executable lookup to `FFMPEGMuxer.resolve_command`, so its inputs and return values can be cached using `functools.lru_cache` without relying on a Streamlink session instance as input - Keep interface of `FFMPEGMuxer.is_usable` and `FFMPEGMuxer.command` - Add proper tests
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I'll submit another PR which will update the other ffmpegmuxer tests once this one got merged, as it's unrelated to the changes here. |
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Any reviews? The changes are fairly simple. |
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Sorry @bastimeyer. I actually looked at this 3 days ago but guess I closed the tab instead of merging. |
Billy2011
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- Remove redundant commands with `.exe` suffixes. `shutil.which` will pick those up via `PATHEXT` on Windows. - Move executable lookup to `FFMPEGMuxer.resolve_command`, so its inputs and return values can be cached using `functools.lru_cache` without relying on a Streamlink session instance as input - Keep interface of `FFMPEGMuxer.is_usable` and `FFMPEGMuxer.command` - Add proper tests
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.exesuffixes.shutil.whichwill pick those up viaPATHEXTon Windows.FFMPEGMuxer.resolve_command, so its inputsand return values can be cached using
functools.lru_cachewithoutrelying on a Streamlink session instance as input
FFMPEGMuxer.is_usableandFFMPEGMuxer.commandFFMPEGMuxer.is_usablecurrently doesn't get cached, which means that when generating a list ofMuxedHLSStreams for example,ffmpegwill get looked up every single time, and additionally when a the stream gets opened.I didn't remove
avconvyet, even if it's totally useless nowadays (the libav fork of ffmpeg was abandoned in 2018). There might still be someone though using an old Debian or CentOS release which defaults to libav.