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Support MP4 with the "ftypiso5" file header #4

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MainasuK
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Some GIFV media from Twitter cannot be parsed as MP4 video due to the box container using the "ftypiso5" which the coder does not accept. This patch appends the "ftypiso5" predicate to fix it. Then the Animated Image now playback this GIFV from the URL without issue.

Ref:

https://github.com/FFmpeg/FFmpeg/blob/290de647595051034d8f021f24bb4610b2f39943/libavformat/movenc.c#L4945
The FFmpeg writes this major brand for MP4 with default-base-is-moof feature flag.

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