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I noticed that when sharing videos to a group iMessage the video quality was significantly downgraded, while sharing the same video directly to an individual recipient didn't cause a quality downgrade.
As a specific example a 30.2Mb HEVC video got reduced to a 24.3Mb H.264 video and the converted video quality was awful. Wanted to see if there is a setting to turn off auto downgrade of videos when sharing.
The degradation is due to the message services super compressing the video, so it's a manageable size. Text services do not deal with really large files well.
The shorter the video, the smaller the original file size, the more quality you'll retain, universally speaking.
Going from native clients (iPhones using Apple's Messages platform) will have the least amount of degradation.
Going from one platform (say Android) to another (say Messages), they're speaking two different languages. Apple currently uses a more proprietary format, not as sophisticated as what other smart phone platforms use, and this will be the absolute worse degradation you'll see.
The server does that to maximize delivery speed. Nothing you can do other than use a different service.
Under what downgrade does the video share quality?
under the what knowledge does sharing the videos to a group iMessage downgrade the quality ?
Do not understand the question. Text messaging downgrades photos and videos on all platforms to start with.
Under what conditions does iMessage downgrade shared video quality?
