User`s guide

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5: Adding and Removing Clips

DIF An industry standard format used to store DVCPRO 25,

DVCPRO 50, DVCAM, and DV (16-bit/48 Khz audio

only) compressed material.

MXF An industry standard format used to store MPEG-2,

DVCPRO 25, and DVCPRO 50.

SMPTE 360M (playout only) An industry-standard exchange format. Playout support

is limited to MPEG-2 I-frame compression.

Adding Clips to the SGI Media Server

The simplest way to move clips from an editing workstation to the SGI Media Server is

with FTP. VST contains a customized version of ftpd tailored for the VST environment

and strictly dependent on a real-time ﬁlesystem. The VST version of the FTP daemon is

the program vtrftpd. The ftp client is unchanged. In VST, the inetd process is

conﬁgured to invoke /usr/vtr/bin/vtrftpd when a connection request from a FTP

client arrives on port 20 to initiate a ﬁle transfer.

The VST FTP daemon vtrftpd has the following features:

• Stores to the real-time subvolume of a ﬁlesystem.

• Has conﬁgurable guaranteed rate I/O (GRIO) for stores or retrievals.

• Automatic disk- and network-I/O sizing.

• Honors in and out points while transferring DIF ﬁles.

• Updates the clip cache so that the clip is available before the end of the transfer.

• Does not quit on the end-of-ﬁle condition for growing clips.

• Can be used to set start, in, and out points of a clip.

See the vtrftpd(1) man page for syntax and usage options. The vst_eoe.sw.ftpd

subsystem contains the vtrftpd daemon and other ﬁle transfer-related components.

Transferring Clips to the SGI Media Server

The SGI Media Server depends on the XFS real-time ﬁlesystem, an optional component

of IRIX. A real-time ﬁlesystem consists of two partitions: a data partition and the