Convert M2T to AMR

Total Audio MP3 Converter converts M2T 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.

1. Free Download Total Audio MP3 Converter here and then install the software by instructions
2. Launch Total Audio MP3 Converter
3. Choose M2T Files


Click "Add Files" to choose M2T files and then add them to conversion list.


Choose one or more M2T files you want to convert and then click Open.


4. Choose "to AMR"




5. Convert M2T to AMR


Click button "Convert" to convert M2T files to AMR format.


The software is converting M2T files to AMR format.


6. Play and Browse AMR File


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

Free Download Total Audio MP3 Converter

What is M2T?
M2T is file extension of HDV. HDV is a format for recording of high-definition video on DV cassette tape. The format was originally developed by JVC and supported by Sony, Canon and Sharp. The four companies formed the HDV consortium in September 2003.

Conceived as an affordable high definition format for digital camcorders, HDV quickly caught on with many amateur and professional videographers due to its low cost, portability and image quality acceptable for many professional productions.

HDV video and audio are encoded in digital form, using lossy compression. Video is encoded with the MPEG-2 codec at a rate of either 19 or 25 Mbit/s (depending on the frame-size), using 8-bit chroma and luma samples with 4:2:0 chroma subsampling. Stereo audio is encoded with the MPEG-1 Layer 2 codec, at 384 kbit/s. The compressed audio and video are multiplexed into a MPEG transport stream, which is typically captured onto magnetic tape, but which can also be stored in a computer file.

Because the primary recording media ¡ª tape ¡ª is transported with constant linear speed, the rate control for both the audio and video compression are locked to a constant bitrate. At the bitrates and frame-sizes (1280x720, 1440x1080) at which HDV operates, the video compression may introduce visible artifacts artifacts, such as blockiness, blurring, ringing. Artifacts are most visible in playback of scenes with lots of fine detail, rapid movement or other complex activity like flashing lights. These scenes would demand the bitrate to exceed the fixed 25Mbit/sec that HDV allocates for the video bitstream, and hence, suffer visible degradation. In contrast to the video, HDV audio bitrate is comparatively generous. At the coded bitrate of 384kbit/s, MPEG-1 Layer 2 audio is regarded as perceptually lossless.

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)

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