艾欣瞳 人工角膜:求问:hint后的mp4和没hint前mp4文件有什么不同?
来源:百度文库 编辑:九乡新闻网 时间:2024/04/29 23:18:01
hint只是在原有的视音频轨道上增加一些流化信息,因此它和是否能够快进快退没有关系,只和文件能否流化有关系。换句话说,没有hint过的mp4文件也是可以快进快退的。
hint的具体解释可以参考下面这段英文:
Hint tracks are a series of instructions in a mp4 container file that
tell a server how to transmit packets. Hint tracks always refer
to another track, most likely an audio or video media track.
This series of instructions tells the server when to send the packet,
what type of RTP header to add, if there is any extra data in the
packet, and how much data to send in the packet. To save on space,
a hint can contain a pointer to the media track, instead of duplicating
that data.
It will also tell what SDP to add for the track that is referenced.
So, a file that is hinted should have a media track, and an associated
hint track for that media track. There are some mp4 container files
that just have hint tracks - these are called "fat hints " and are
usually not playable locally. These are illegal in ISMA, so we won 't
talk about them.
To create hint tracks for a mp4 file is fairly simple with the mp4creator
program. Just execute the:
mp4creator -hint=
hint的具体解释可以参考下面这段英文:
Hint tracks are a series of instructions in a mp4 container file that
tell a server how to transmit packets. Hint tracks always refer
to another track, most likely an audio or video media track.
This series of instructions tells the server when to send the packet,
what type of RTP header to add, if there is any extra data in the
packet, and how much data to send in the packet. To save on space,
a hint can contain a pointer to the media track, instead of duplicating
that data.
It will also tell what SDP to add for the track that is referenced.
So, a file that is hinted should have a media track, and an associated
hint track for that media track. There are some mp4 container files
that just have hint tracks - these are called "fat hints " and are
usually not playable locally. These are illegal in ISMA, so we won 't
talk about them.
To create hint tracks for a mp4 file is fairly simple with the mp4creator
program. Just execute the:
mp4creator -hint=
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