dat 文件,视频文件的后缀是什么

dat 文件，视频文件的后缀是什么？

常见的有：AVI、mov、RMVB、RM、FLV、mp4、3GP等。

1、AVI

AVI这个由微软公司发布的视频格式，在视频领域可以说是最悠久的格式之一。AVI格式调用方便、图像质量好，压缩标准可任意选择，是应用最广泛、也是应用时间最长的格式之一。

2、mov

MOV即QuickTime影片格式，它是Apple公司开发的一种音频、视频文件格式，用于存储常用数字媒体类型。用于保存音频和视频信息,甚至WINDOWS7在内的所有主流电脑平台支持。

3、rmVB

RMVB是一种视频文件格式，其中的VB指Variable Bit Rate（可变比特率）。较上一代RM格式画面要清晰很多，原因是降低了静态画面下的比特率。

4、FLV

FLV是Flash VIDEO的简称，FLV流媒体格式是一种新的视频格式。由于它形成的文件极小、加载速度极快，使得网络观看视频文件成为可能，它的出现有效地解决了视频文件导入Flash后，使导出的SWF文件体积庞大，不能在网络上很好的使用等缺点。

5、OGG

Ogg Media是一个完全开放性的多媒体系统计划，OGM（Ogg Media File）是其容器格式。OGM可以支援多视频、音频、字幕（文本字幕）等多种轨道。副档名：ogg

文件的后缀名有那几种类型？

EXE 可执行程序文件 COM 可执行命令文件 BAT 可执行批处理文件 TXT 文本文件 DAT 数据文件 BAK 备份文件

pr支持更改的文件格式？

uzmap是什么文件？

map文件夹用来放 jcs sys dat 的文件！！ T卡中存放一些系统附带文件，以支持部分手机功能和应用。说明如下：DATA (tts) 语音文件Mrp 存放地图 mrapp 展讯芯片的机子存放手机QQ 游戏 mythroad： 存放手机QQ、QQ网游、多媒体电子书、股票机数据文件几其它

dmesg命令详解？

linux dmesg命令参数及用法详解(linux显示开机信息命令)

功能说明：显示开机信息。

语 法：dmesg [-cn][-s <缓冲区大小>]

补充说明：kernel会将开机信息存储在ring buffer中。您若是开机时来不及查看信息，可利用dmesg来查看。开机信息亦保存在/var/log目录中，名称为dmesg的文件里。

参 数：

-c 显示信息后，清除ring buffer中的内容。

-s<缓冲区大小> 预设置为8196，刚好等于ring buffer的大小。

-n 设置记录信息的层级。扩展阅读一:dmesg命令主要用途

主要应用：

dmesg用来显示内核环缓冲区（kernel-ring buffer）内容，内核将各种消息存放在这里。在系统引导时，内核将与硬件和模块初始化相关的信息填到这个缓冲区中。内核环缓冲区中的消息对于诊断系统问题 通常非常有用。在运行dmesg时，它显示大量信息。通常通过less或grep使用管道查看dmesg的输出，这样可以更容易找到待查信息。例如，如果发现硬盘性能低下，可以使用dmesg来检查它们是否运行在DMA模式：

$dmesg | grep DMA

...

ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA

ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA

...上面几行可以说明每个IDE设备正在什么模式下运行。如果以太网连接出现问题，那么可以在dmesg日志中搜索eth：

$dmesg | grep eth

forcedeth.c: Reverse Engineered nForce

ethernet driver. Version 0.49.

eth0: forcedeth.c: subsystem: 0147b:1c00

bound to 0000:00:04.0

eth0: no IPv6 routers present如果一切正常，那么dmesg显示每个网卡的硬件配置信息。如果某项系统服务未能得到正确的配置，dmesg日志很快就填满错误消息，这是诊断故障的良好起点。

还可以用来探测系统内核模块的加载情况，比如要检测ACPI的加载情况，使用dmesg | grep acpi

dmesg |egrep -i ''(apm|acpi)''

Kernel command line: vga=274 quiet console=ttyS3,9600acpi=no-idleoot=/dev/hda3

ACPI: Core Subsystem version [20010208]

ACPI: Subsystem enabled

ACPI: System firmware supports: C2

ACPI: plvl2lat=99 plvl3lat=1001

ACPI: C2 enter=1417 C2 exit=354

ACPI: C3 enter=-1 C3 exit=-1

ACPI: Not using ACPI idle

ACPI: System firmware supports: S0 S1 S4 S5

扩展阅读二：dmesg命令使用示例

使用示例

示例一 将开机信息发邮件

man dmesg 写道

The program helps users to print out their bootup messages. Instead of copying the messages by hand, the user need only:

dmesg > boot.messages

and mail the boot.messages file to whoever can debug their problem.

[root@new55 ~]# dmesg >boot.messages

[root@new55 ~]# ls -l boot.messages

-rw-r--r-- 1 root root 15838 12-09 12 begin_of_the_skype_highlighting

15838 12-09 12 免费 end_of_the_skype_highlighting:55 boot.messages[root@new55 ~]# mail -s "Boot Log of Linux Server" public@web3q.net <boot.messages

[root@new55 ~]#示例二 浏览dmesg输出的信息

[root@new55 ~]# uname -a

Linux new55 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:43 EDT 2010 i686 i686 i386 GNU/Linux[root@new55 ~]# dmesg | less

Linux version 2.6.18-194.el5 (mockbuild@x86-007.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Mar 16 21:52:43 EDT 2010

BIOS-provided physical RAM map:

BIOS-e820: 0000000000010000 - 000000000009fc00 (usable)

BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)

BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)

BIOS-e820: 0000000000100000 - 000000001f7d0000 (usable)

BIOS-e820: 000000001f7d0000 - 000000001f7efc00 (reserved)

BIOS-e820: 000000001f7efc00 - 000000001f7fb000 (ACPI NVS)

BIOS-e820: 000000001f7fb000 - 000000001f800000 (reserved)

BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)

BIOS-e820: 00000000fec00000 - 00000000fec02000 (reserved)

BIOS-e820: 00000000fed20000 - 00000000fed9b000 (reserved)

BIOS-e820: 00000000feda0000 - 00000000fedc0000 (reserved)

BIOS-e820: 00000000ffb00000 - 00000000ffc00000 (reserved)

BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)

0MB HIGHMEM available.

503MB LOWMEM available.

Memory for crash kernel (0x0 to 0x0) notwithin permissible range

disabling kdump

Using x86 segment limits to approximate NX protection

On node 0 totalpages: 128976

DMA zone: 4096 pages, LIFO batch:0

Normal zone: 124880 pages, LIFO batch:31

DMI 2.3 present.

Using APIC driver default

ACPI: RSDP (v000 HP ) @ 0x000fe270

ACPI: RSDT (v001 HP 30C4 0x31100620 HP 0x00000001) @ 0x1f7efc84

ACPI: FADT (v002 HP 30C4 0x00000002 HP 0x00000001) @ 0x1f7efc00

ACPI: MADT (v001 HP 30C4 0x00000001 HP 0x00000001) @ 0x1f7efcb8

ACPI: MCFG (v001 HP 30C4 0x00000001 HP 0x00000001) @ 0x1f7efd14

ACPI: SSDT (v001 HP HPQPpc 0x00001001 MSFT 0x0100000e) @ 0x1f7f6698

ACPI: DSDT (v001 HP DAU00 0x00010000 MSFT 0x0100000e) @ 0x00000000

ACPI: PM-Timer IO Port: 0x1008

ACPI: Local APIC address 0xfec01000

ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)

Processor #0 6:13 APIC version 20

ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])

ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])

IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23

:

示例三 查看dmesg尾部的信息

[root@new55 ~]# dmesg | tail

Bluetooth: L2CAP ver 2.8

Bluetooth: L2CAP socket layer initialized

Bluetooth: RFCOMM socket layer initialized

Bluetooth: RFCOMM TTY layer initialized

Bluetooth: RFCOMM ver 1.8

Bluetooth: HIDP (Human Interface Emulation) ver 1.1

eth0: no IPv6 routers present

Installing knfsd (copyright (C) 1996 okir@monad.swb.de).

NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory

NFSD: starting 90-second grace period

[root@new55 ~]#

示例四 安装SS7卡驱动时的内核日志

[root@localhost ss7dpklnx]# cd SS7HD_DRIVER/

[root@localhost SS7HD_DRIVER]# ls

bbdddlnx_iss.h bbd_hbi.h bbd_ioc.c bbd_isr.c bbd_pci.c BSD_license.txt GPL_V2-only_license.txt install_ss7hd.sh makefile26

bbd_def.h bbd_hs.c bbd_ioc.h bbd_lnx.c bbd_pro.h build_ss7hd.sh i21555.h Makefile24

[root@localhost SS7HD_DRIVER]# ./build_ss7hd.sh

make: Entering directory `/usr/src/kernels/2.6.9-22.EL-i686'

CC [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/bbd_hs.o

CC [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/bbd_ioc.o

CC [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/bbd_isr.o

CC [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/bbd_pci.o

CC [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/bbd_lnx.o

LD [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/ss7hddvr26.o

Building modules, stage 2.

MODPOST

CC /root/setup/ss7dpklnx/SS7HD_DRIVER/ss7hddvr26.mod.o

LD [M] /root/setup/ss7dpklnx/SS7HD_DRIVER/ss7hddvr26.ko

make: Leaving directory `/usr/src/kernels/2.6.9-22.EL-i686'http://www.linuxso.com/command/dmesg.html[root@localhost SS7HD_DRIVER]# ./install_ss7hd.sh

[root@localhost SS7HD_DRIVER]# lsmod | grep ss7

ss7hddvr26 25808 0

[root@localhost SS7HD_DRIVER]# dmesg | tail

ACPI: PCI interrupt 0000:02:0d.0[?] -> GSI 9 (level, low) -> IRQ 9

BBD[0] 64bit

SS7HD[0] - suspend

Dialogic SS7HD Device Driver V100.00 (Source V1.21)

Copyright (C) Dialogic Corporation 2003-2010. All Rights Reserved

Using major device number 251.

ACPI: PCI interrupt 0000:02:0d.0[?] -> GSI 9 (level, low) -> IRQ 9

BBD[0] 64bit

[root@localhost SS7HD_DRIVER]# ./install_ss7hd.sh remove

[root@localhost SS7HD_DRIVER]# lsmod | grep ss7

[root@localhost SS7HD_DRIVER]# dmesg | tail

BBD[0] 64bit

SS7HD[0] - suspend

Dialogic SS7HD Device Driver V100.00 (Source V1.21)

Copyright (C) Dialogic Corporation 2003-2010. All Rights Reserved

Using major device number 251.

ACPI: PCI interrupt 0000:02:0d.0[?] -> GSI 9 (level, low) -> IRQ 9

BBD[0] 64bit

SS7HD[0] - suspend

[root@localhost SS7HD_DRIVER]#

示例五 打印并清除内核环形缓冲区

[root@new55 ~]# dmesg -c

Linux version 2.6.18-194.el5 (mockbuild@x86-007.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Mar 16 21:52:43 EDT 2010

BIOS-provided physical RAM map:

BIOS-e820: 0000000000010000 - 000000000009fc00 (usable)

BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)

BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)

BIOS-e820: 0000000000100000 - 000000001f7d0000 (usable)

BIOS-e820: 000000001f7d0000 - 000000001f7efc00 (reserved)

BIOS-e820: 000000001f7efc00 - 000000001f7fb000 (ACPI NVS)

BIOS-e820: 000000001f7fb000 - 000000001f800000 (reserved)

BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)

BIOS-e820: 00000000fec00000 - 00000000fec02000 (reserved)

BIOS-e820: 00000000fed20000 - 00000000fed9b000 (reserved)

BIOS-e820: 00000000feda0000 - 00000000fedc0000 (reserved)

BIOS-e820: 00000000ffb00000 - 00000000ffc00000 (reserved)

BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)

0MB HIGHMEM available.

503MB LOWMEM available.

Memory for crash kernel (0x0 to 0x0) notwithin permissible range

disabling kdump

Using x86 segment limits to approximate NX protection

On node 0 totalpages: 128976

DMA zone: 4096 pages, LIFO batch:0

Normal zone: 124880 pages, LIFO batch:31

DMI 2.3 present.省略输出

Bluetooth: HIDP (Human Interface Emulation) ver 1.1

eth0: no IPv6 routers present

Installing knfsd (copyright (C) 1996 okir@monad.swb.de).

NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory

NFSD: starting 90-second grace period

[root@new55 ~]# dmesg[root@new55 ~]# less /var/log/dmesg

Linux version 2.6.18-194.el5 (mockbuild@x86-007.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Mar 16 21:52:43 EDT 2010

BIOS-provided physical RAM map:

BIOS-e820: 0000000000010000 - 000000000009fc00 (usable)

BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)

BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)

BIOS-e820: 0000000000100000 - 000000001f7d0000 (usable)

BIOS-e820: 000000001f7d0000 - 000000001f7efc00 (reserved)

BIOS-e820: 000000001f7efc00 - 000000001f7fb000 (ACPI NVS)

BIOS-e820: 000000001f7fb000 - 000000001f800000 (reserved)

BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)

BIOS-e820: 00000000fec00000 - 00000000fec02000 (reserved)

BIOS-e820: 00000000fed20000 - 00000000fed9b000 (reserved)

BIOS-e820: 00000000feda0000 - 00000000fedc0000 (reserved)

BIOS-e820: 00000000ffb00000 - 00000000ffc00000 (reserved)

BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)

0MB HIGHMEM available.

503MB LOWMEM available.

Memory for crash kernel (0x0 to 0x0) notwithin permissible range

disabling kdump

Using x86 segment limits to approximate NX protection

On node 0 totalpages: 128976

DMA zone: 4096 pages, LIFO batch:0

Normal zone: 124880 pages, LIFO batch:31

DMI 2.3 present.

Using APIC driver default

ACPI: RSDP (v000 HP ) @ 0x000fe270

ACPI: RSDT (v001 HP 30C4 0x31100620 HP 0x00000001) @ 0x1f7efc84

ACPI: FADT (v002 HP 30C4 0x00000002 HP 0x00000001) @ 0x1f7efc00

ACPI: MADT (v001 HP 30C4 0x00000001 HP 0x00000001) @ 0x1f7efcb8

ACPI: MCFG (v001 HP 30C4 0x00000001 HP 0x00000001) @ 0x1f7efd14

ACPI: SSDT (v001 HP HPQPpc 0x00001001 MSFT 0x0100000e) @ 0x1f7f6698

ACPI: DSDT (v001 HP DAU00 0x00010000 MSFT 0x0100000e) @ 0x00000000

ACPI: PM-Timer IO Port: 0x1008

ACPI: Local APIC address 0xfec01000

ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)

Processor #0 6:13 APIC version 20

ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])

ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])

IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23

[root@new55 ~]#