The compression config computed a target bitrate purely from the output
resolution and frame rate, ignoring the bitrate already extracted from the
source. A clip that is small because it was efficiently encoded, rather
than because it is short, was therefore re-encoded upwards: the upload got
slower and the resulting file was larger than the original.
The target is now clamped to the source bitrate when that is known.
METADATA_KEY_BITRATE is the container total, video plus audio, so it is a
safe upper bound for the video track alone. An unknown or zero bitrate
still falls back to the calculated value.
Relates to https://github.com/element-hq/element-x-android/issues/4191
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