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The top-level ASF Header Object for a file contains several ASF sub-header objects. The ContentInfo object stores information from all of these Header Objects and exposes certain values to an application through attributes.
File Properties Object
This header object is present in all ASF files. These fields describe the file-level attributes of the entire presentation. The following table lists the fields in the File Properties Object and the corresponding presentation descriptor attributes.
Stream Properties Object
This header object describes the properties of the streams in the ASF file. In Media Foundation, this is managed by the profile object and the stream configuration object. For more information, see Creating and Configuring ASF Streams.
Codec List Object
If this header object is present, the MF_PD_ASF_CODECLIST attribute provides a list of codecs that were used to encode the streams within the ASF file. Each stream should have its codec information in this object.
Script Command Object
If this header object is present, it specifies a list of script commands that are supported in the ASF file. A script command consists of a command type, a command name, and a presentation time. The command type and command name are wide-character strings. These commands can be used to notify the client to perform an action at a certain point in the presentation. For example, an application can use the command type 'FILENAME' to play a continuous sequence of ASF files.
To get the list of script commands, get the MF_PD_ASF_SCRIPT attribute from the presentation descriptor. An application should retrieve all of the script commands before starting playback.
Asf Video File FormatMarker Object
A marker is a bookmark within an ASF file. An application can use markers to seek to various points within the content. Each marker consists of a marker name, the associated presentation time, and the offset from the start of the file. The MF_PD_ASF_MARKER attribute provides a list of markers that are available for the file.
Stream Bitrate Properties Object
This header stores the average bit rate of each stream present in the ASF file. This value is stored on the stream descriptor for the stream in the MF_SD_ASF_STREAMBITRATES_BITRATE attribute.
Content Encryption Object
This header object is present if the content provider has protected the content by using Microsoft Digital Rights Management. The following table lists the fields in the Content Encryption Object and the corresponding presentation descriptor attributes:
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Free Asf File ConverterExtended Content Encryption Object
This header object is present if the content provider has protected the content by using the Windows Media Rights Manager 7 SDK. The MF_PD_ASF_CONTENTENCRYPTION_LICENSE_URL attribute provides a byte array that corresponds to the Data field of the header object. Blackberry bold 9780 desktop software for mac. This field is required to use the content.
Mac Software To Read Asf Files DownloadExtended Stream Properties Object
This header is part of the Header Extension Object. The Extended Stream Properties Object provides properties of the stream that are not defined in the Stream Properties Object. These properties are used mainly to determine the 'leaky bucket' parameters, which are used by the decoder. These properties are also used by the encoder when compressing data. This is managed by the profile object and the stream configuration object. For more information, see Creating and Configuring ASF Streams.
The following table lists the Extended Stream Properties Object fields and the corresponding stream descriptor attributes. Organizing iphone apps on mac 2019 free.
Language List Object
This header object is part of the Header Extension Object. If present, the MF_PD_ASF_LANGLIST attribute provides a list of language identifiers that are supported in the file. The identifiers are compliant with RFC 1766 for specifying languages. Free basic photo editing software for mac.
Mutual Exclusion Object
This header specifies groups of streams and their properties, only one of which will be delivered at a time. For more information, see Using Mutual Exclusion for ASF Streams.
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