mp4creator60.exe参数-hint的说明
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本文转自:http://bbs.csdn.net/topics/110145566
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=<track to hint track number> [-p <payload>] <mp4file>
For example:
[wmay@wmaytclinux2 content]$ mp4info xvid.mp4
mp4info version 0.9.5.4
xvid.mp4:
Track Type Info
1 video MPEG-4 Simple @ L3, 3.695 secs, 627 kbps, 608x256 @ 23.00 fps
2 od Object Descriptors
3 scene BIFS
I would execute the:
mp4creator -hint=1 xvid.mp4
and get:
[wmay@wmaytclinux2 content]$ mp4info xvid.mp4
mp4info version 0.9.5.4
xvid.mp4:
Track Type Info
1 video MPEG-4 Simple @ L3, 3.695 secs, 627 kbps, 608x256 @ 23.00 fps
2 od Object Descriptors
3 scene BIFS
4 hint Payload MP4V-ES for track 1
下文转自:http://blog.csdn.net/bluebirdssh/article/details/6152928
正常的MP4文件应该是没有被流化,如果要被darwin stream server支持,必须hint该MP4文件。
关于hint的解释,如下面一段英文:
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= <track to hint track number> <mp4file>
例如:
1)被hint之前mp4文件的信息,用mp4info查看文件信息如下:
mp4info ./1.mp4
mp4info version 1.6
./1.mp4:
Track Type Info
1 audio MPEG-4 AAC LC, 662.165 secs, 121 kbps, 48000 Hz
2 video H264 Main@5.1, 662.562 secs, 1756 kbps, 640x368 @ 29.970025 fps
2)hint 音频
mp4creator -hint=1 ./1.mp4
3)hint视频
mp4creator -hint=2 ./2.mp4
4)查看hint之后的mp4文件信息
mp4info ./1.mp4
mp4info version 1.6
./1.mp4:
Track Type Info
1 audio MPEG-4 AAC LC, 662.165 secs, 121 kbps, 48000 Hz
2 video H264 Main@5.1, 662.562 secs, 1756 kbps, 640x368 @ 29.970025 fps
3 hint Payload mpeg4-generic for track 1
4 hint Payload H264 for track 2
Tool: mp4creator 1.5.0.1
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