Convert DVR-MS to SPX (Speex)

FLV MP3 Converter converts DVR-MS to SPX (Speex) easily and quickly. Speex is an Open Source/Free codec patent-free audio compression format designed for speech. The Speex codec aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs.

FLV MP3 Converter is also a professional audio conversion software. The software supports almost any video and audio formats such as WMA, WAV, MP3, MP2, M4B (MPEG-4 audiobook), AMR, AAC, MKA, FLAC, AAC for iPod/iPhone/iPad/iTunes/DSi, etc. It could convert WMV to AAC, AU to FLAC, MP3 to CAF (Core Audio Format), 3GP to CAF (Core Audio Format), M4V to MPA, MP3 to AU, AU to SPX, WV to ALAC (Apple Lossless), and so on.

FLV MP3 Converter supports batch conversion and, is full compatible with 32-bit and 64-bit editions of Vista and Windows 7.

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 SPX?
Speex is a patent-free audio compression format designed for speech and also a free software speech codec that may be used on VoIP applications and podcasts. It is based on the CELP speech coding algorithm. Speex claims to be free of any patent restrictions and is licensed under the revised (3-clause) BSD license. It may be used with the Ogg container format or directly transmitted over UDP/RTP. The Speex designers see their project as complementary to the Vorbis general-purpose audio compression project. Speex is a lossy format, meaning quality is permanently degraded to reduce file size. Speex is based on CELP and is designed to compress voice at bitrates ranging from 2 to 44 kbps. Some of Speex's features include:

• Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream
• Intensity stereo encoding
• Packet loss concealment
• Variable bitrate operation (VBR)
• Voice Activity Detection (VAD)
• Discontinuous Transmission (DTX)
• Fixed-point port
• Acoustic echo canceller
• Noise suppression

Note that Speex has a number of features that are not present in other codecs, such as intensity stereo encoding, integration of multiple sampling rates in the same bitstream (embedded coding), and a VBR mode.

Step-by-Step Instructions to Convert DVR-MS to SPX (Speex):

1. Click Here to Download FLV MP3 Converter
2. Install the Software by Instructions
3. Launch FLV MP3 Converter by Clicking Start -> All Programs -> FLV MP3 Converter -> FLV MP3 Converter
4. Choose DVR-MS Files


Click "Add Files" to choose DVR-MS files.


Choose one or more DVR-MS files you want to convert and then click Open.

FLV MP3 Converter will open DVR-MS files and get file information of the file such as duration, bit rate, sample rate, and channels, and then show the information of DVR-MS file at conversion list.



5. Choose Output Format


Choose "to SPX (Speex)" at Output Format combo-box.


6. [Optional, for advanced user] Set SPX Encoding Parameters


If you want to change SPX encoding parameters such as bit rate, sample rate, channels, or volume, please click "Options".


And then, switch to tab "Audio" and choose "SPX (Speex) (*.spx)" at "Output Format", and then set encoding parameters.


7. Convert DVR-MS to SPX (Speex)


Click "Convert" to convert DVR-MS files to SPX (Speex).


FLV MP3 Converter is converting DVR-MS files to SPX (Speex).


8. Play and Browse SPX File


When conversion completes, you can right-click converted item and choose "Play Destination" to play the outputted SPX file; or choose "Browse Destination Folder" to open Windows Explorer to browse the outputted SPX file.


9. Done

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DVR-MS to SPX Conversion Software is 100% clean and safe to install. It's certified by major download sites.

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