Commit 29f28d6 changed c2c video `compatQmsgSceneType` from 2 to 1
as a "symmetric asymmetry" cleanup, matching the image/ptt convention
where the field tracks the upload's sceneType (c2c=1, group=2). For
video this is wrong.
Image and ptt have *different* legacy compat elements per scene
(notOnlineImage vs customFace; ptt c2c vs group), so the server needs
to know which scene shape to emit. The legacy `videoFile` element
(packet element type 19) has no scene split — fromChatType /
toChatType live inside the element itself — so the QQ NT server
emits a single group-shaped compat payload regardless. NapCat
hardcodes `compatQMsgSceneType: 2` for *both* UploadGroupVideo and
UploadPrivateVideo for exactly this reason.
Setting it to 1 on c2c made the server emit a c2c-scene shaped
compat blob that older QQ clients failed to resolve, showing the
message as "视频已过期" on those receivers. Newer clients only read
the commonElem(48, 11) and displayed fine — which is why only "some
devices" saw the breakage.
Keep `commonElem.businessType = isGroup ? 21 : 11` untouched — that
piece of 29f28d6 is still correct and is what fixed PbSendMsg
result=79.
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