avformat/file: add fd protocol
Unlike the pipe protocol, fd protocol has seek support if it
corresponding to a regular file.
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
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Unlike the pipe protocol, fd protocol has seek support if it
corresponding to a regular file.
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>