Audio

Allows altering the audio settings from that of the Standard preset if necessary.


In Version 22.3 or later.



Base Audio Settings

- Stream Format
Specifies the audio stream compression format.
Available formats are different depending on the selected "Stream Format" in the "Multiplexer" tab.
MPEG-1/2
Audio Layer II/III		 Encodes in the MP2 format, used as the standard MPEG-1/2 audio format.
The MPEG-2 Audio format provides more efficient compression, almost halving the output file size. The maximum bitrate is different between Layer 2 and 3.
Dolby Digital A high-quality audio format used in DVD-Video or Blu-ray and developed by Dolby Laboratories. This options allows up to a 5.1 channel mode.
Linear PCM An uncompressed audio format. This format is mostly used for keeping the original quality of DVD-Video or Blu-ray, etc. It provides audio quality higher than an Audio CD but generates huge files compared to other formats.
MPEG-2/4 AAC An audio compression format generally used in smartphones, audio players, video sharing sites, etc.
In general, when storing in an MP4 type stream, MPEG-4 AAC is used, and when storing in an MPEG-2 type stream, MPEG-2 AAC is used. The difference between Main Profile and Low Complexity is the later provides a lower compression rate but is faster to encode and decode. Many cellular phones use Low Complexity (LC). If you want to keep the bitrate as low as possible while maintaining high audio quality (although limited to stereo), you can set the audio format to HE-AAC. HE-AAC v2 is capable of setting the sound quality at an even lower bitrate. Since some players may not be able to playback the HE-AAC audio while keeping the quality, please select the appropriate format that can be played on such devices.
FLAC A lossless compression format, which is able to reduce the bitrate while mostly keeping the quality. It can be set as high quality audio data such as 24bit 192kHz, etc... The bitrate is not constant because it depends on the source bitrate. Some players may not be able to playback this audio format; please check the player's specification before using this format.
* This format is available only when selecting "MKV" as the "Stream Format" in the "Multiplexer" tab.


- Sampling Rate
Specifies the number of audio samples evaluated per second, which allows values between [8KHz] and [192KHz]. Regarding the bandwidth range of the each format, please refer to the table of the Channel Mode settings.
* Usable values are different depending on each stream format.
* Usable values for playback depend on the player device.


- Channel Mode
Specifies the number of channels for the compressed audio. The "Joint stereo" mode extracts the difference between the left and right channels and discards the identical pattern, keeping only the necessary information, and allowing better compression efficiency.
*Usable values are different depending on each stream format and sampling rate.
*Output audio will be down-mixed when the selected number of channels is less than that of the source. When a number of channels set in the sequence of Adobe Premiere Pro is greater than the output setting, the excessive channels will be discarded.
Sampling Rate Channel Mode
MPEG-1 Audio
Layer II/III		 32000, 44100, 48000Hz Monaural, Stereo, Joint stereo, Dual Monaural
MPEG-2 Audio
Layer II/III		 16000, 22050, 24000Hz Monaural, Stereo, Joint stereo, Dual Monaural
Dolby Digital 32000, 44100, 48000Hz Monaural, Stereo, Dual Monaural
5ch Surround, 5.1ch Surround
Linear PCM 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000, 128000, 176400, 192000Hz Monaural, Stereo, 1.1ch Monaural, 2.1ch Stereo, 3ch Surround (3/0), 3ch Surround (2/1), 3.1ch Surround (3/0), 3.1ch Surround (2/1), 4ch Surround (2/2), 4ch Surround (3/1), 5ch Surround, 5.1ch Surround, 7ch Surround (3/2/2), 7ch Surround (5/2), 7.1ch Surround (3/2/2), 7.1ch Surround (5/2)
AAC 8000, 11025, 12000,
16000, 22050, 24000,
32000, 44100, 48000,
64000, 88200, 96000Hz		 Monaural, Stereo, Dual Monaural, 3ch Surround (3/0), 3ch Surround (2/1), 4ch Surround (3/1), 4ch Surround (2/2), 5ch Surround, 5.1ch Surround
FLAC 8000, 16000, 22050,
24000, 32000, 44100,
48000, 88200, 96000,
176400, 192000Hz		 Monaural, Stereo, 3ch Surround (3/0), 4ch Surround (2/2), 5ch Surround, 5.1ch Surround, 6.1ch Surround (3/2/1), 7.1ch Surround (3/2/2)


- Quantization
Specifies the number of bits used to encode the audio range. The higher the value, the better the audio rendering. In the Linear PCM and FLAC stream format, you can choose between 16, 20, or 24 bits. Also, the higher the bit count, the higher the bitrate.
* This option is available only for Linear PCM and FLAC.
* When the [System Format:] is set to [MP4] or [None (Elementary)], Linear PCM supports 8 to 64 bit(float).
* Usable values for playback depend on the player device.


- Bitrate
Specifies the quantity of audio data per second. The outputted file size increases with the bitrate. The available bitrates depend on the selected Stream format.
* The maximum value depends on the Stream Format, the Sampling Rate, the Channel mode, and the Quantization.
* Linear PCM or FLAC cannot be set manually. The value is not set because it depends on the source file when the "FLAC" is set.
* Usable values for playback depend on the player device.


- Error Protection (CRC)
Sets a flag in the audio data indicating CRC error correction data is also present.


- Set "Original" flag
This option marks the data as being original audio. There is no effect on the function or audio quality.


- Set "Copyright" flag
This option marks the data as being copyrighted audio. There is no effect on the function or audio quality.


- Set "Private" flag
This option marks the data as being private audio. There is no effect on the function or audio quality.

* The above flags are used only by the supported players, usable values for playback depend on the player device.