 |
Convert DVR to AMR
|
Total Audio MP3 Converter converts DVR files to AMR format.
The software is an all in one audio converter that supports more than 90 audio
and video files as input, and converts to popular formats such as MP3, WAV, AAC,
M4A, OGG, WMA, and AMR.
Total Audio MP3 Converter also supports batch conversion, and is full compatible
with Vista and Windows
7.
- Free Download
Total Audio MP3 Converter here and then install the software
by instructions
- Launch Total Audio MP3 Converter
- Choose DVR Files
Click "Add Files" to choose DVR files and then add them to conversion
list.
Choose one or more DVR files you want to convert and then click Open.
- Choose "to AMR"
- Convert DVR to AMR
Click button "Convert" to convert all DVR files to AMR format.
The software is converting DVR files to AMR format.
- Play & Browse
When conversion completes, you could right-click converted item and choose "Play
Destination" to play the destination file; or choose "Browse Destination
Folder" to open Windows Explorer to browse the destination file.
Top
What is DVR-MS?
DVR-MS (Microsoft Digital Video Recording) is a proprietary video and audio file
container format, developed by Microsoft. Audio and video are wrapped in an ASF
container with the extension DVR-MS. Video is encoded using the MPEG-2 standard
and audio using MPEG-1 Layer II or Dolby Digital AC-3 (ATSC A/52). The format
extends these standards by including metadata about the content and digital rights
management. The extension was originally used by Zach Johnson who at the time
was a developer for the television recording engine for Microsoft Windows XP Media
Center Edition.
What is AMR?
Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech
coding. AMR was adopted as the standard speech codec by 3GPP in October 1998 and
is now widely used in GSM and UMTS. It uses link adaptation to select from one
of eight different bit rates based on link conditions. AMR is also a file format
for storing spoken audio using the AMR codec. Many modern mobile telephone handsets
will allow you to store short recordings in the AMR format. There also exists
another storage format for AMR that is suitable for applications with more advanced
demands on the storage format, like random access or synchronization with video.
This format is the 3GPP-specified 3GP container format based on ISO base media
file format.
Key Features:
- Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to
200-3400 Hz.
- The AMR codec uses eight source codecs with bit-rates of 12.2, 10.2, 7.95,
7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.
- Generates frame length of 95, 103, 118, 134, 148, 159, 204, or 244 bits for
bit rates 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, or 12.2 kbit/s, respectively
- AMR utilizes Discontinuous Transmission (DTX), with Voice Activity Detection
(VAD) and Comfort Noise Generation (CNG) to reduce bandwidth usage during silence
periods
- Algorithmic delay is 20 ms per frame. For bit-rates of 12.2, there is no 'algorithm'
look-ahead delay. For other rates, look-ahead delay is 5 ms. Note that there is
5 ms 'dummy' look-ahead delay, to allow seamless frame-wise mode switching with
the rest of rates.
- AMR is a hybrid speech coder which uses Algebraic Code Excited Linear Prediction
(ACELP)
- The complexity of the algorithm is rated at 5, using a relative scale where
G.711 is 1 and G.729a is 15.
- PSQM testing under ideal conditions yields Mean Opinion Scores of 4.14 for
AMR (12.2 kbit/s), compared to 4.45 for G.711 (u-law)
- PSQM testing under network stress yields Mean Opinion Scores of 3.79 for AMR
(12.2 kbit/s), compared to 4.13 for G.711 (u-law)
Convert DVR to AMR Related Topics:
SOL to AMR,
M4V to AMR,
MVI to AMR,
HDTV to AMR,
DTS to AMR,
RPL to AMR,
MLP to AMR,
MP4 to AMR,
WAV to AMR,
M2V to AMR,
AMR to AAC,
SMK to AMR,
DV to AMR,
APE to AMR,
AU to AMR,
3G2 to AMR,
GXF to AMR,
F4B to AMR,
VOB to AMR,
MPGA to AMR,
M4B to AMR,
WV to AMR,
MPE to AMR,
MOD to AMR,
ALAW to AMR,
MPEG to AMR,
QCP to AMR,
NSA to AMR,
DVR-MS to AMR,
EVOB to AMR,
MTM to AMR,
F4A to AMR,
OGV to AMR,
DXA to AMR,
M2A to AMR,
NUV to AMR,
AMR to M4A,
MJ2 to AMR,
STR to AMR,
VMD to AMR
|
