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103 lines
2.8 KiB
Markdown
103 lines
2.8 KiB
Markdown
---
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Type: article
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State: [ draft ]
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Title: Audio Codecs
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Project: HandBrake
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Project_URL: https://handbrake.fr/
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Project_Version: Latest
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Language: English
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Language_Code: en
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Authors: [ Scott (s55) ]
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Copyright: 2021 HandBrake Team
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License: Creative Commons Attribution-ShareAlike 4.0 International
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License_Abbr: CC BY-SA 4.0
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License_URL: https://handbrake.fr/docs/license.html
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---
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Audio Codecs
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============
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Encoding vs Passthrough
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-----------------------
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HandBrake supports two modes of operation for handling audio tracks from the
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source.
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It can either:
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- Re-Encode the track into a new format. For example, AC3 or DTS audio from a
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DVD or BluRay into AAC for playback on mobile devices.
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- Passthru copies the audio track from the source to the newly encoded file.
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Audio Encoders
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--------------
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- AAC:
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- Advanced Audio Coding (AAC) is one of the most popular formats available
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in HandBrake and is widly supported by media players and mobile devices.
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- On Linux and Windows, HandBrake uses the FFmpeg AAC encoder.
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- On Mac, HandBrake uses Apple's CoreAudio AAC encoder. It's known to be
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much better quality and is the default option for Mac users.
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- HE-AAC ( Mac Only)
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- High Efficiency AAC encoder. This encoder is optimized for low-bitrate
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applications which may be useful for streaming.
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- Available on Mac only.
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- MP3:
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- HandBrake also offers the MP3 audio codec, for which it uses the very
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well-regarded lame encoder.
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- Vorbis:
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- HandBrake offers Vorbis audio encoding as well, for which it uses the
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aoTuV branch that offers quality tweaks.
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- AC3:
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- HandBrake can encode to AC3 using FFmpeg.
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- This is not the same as Passthru. You can encode any audio track to AC3.
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- Flac 16 and 24bit (FFmpeg)
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- Loss-less audio compression.
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- Available in MKV files.
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- It is not currently possible to passthru the compression level to the
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ffmpeg encoder which is currently defaulted to "5"
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Passthru options.
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-----------------
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HandBrake supports passthru for a limited number of popular source formats.
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These are: AC3, DTS, DTS-HD, TrueHD, MP3 or AAC (Passthru)
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This copies the audio bit-for-bit from the source so offers no loss in audio
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quality. These audio tracks can be quite large so can impact the final size of
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the output file quite substantially.
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Auto Passthru
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-------------
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In the audio encoders list, there is an option called "Auto Passthru". When
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encoding, this will automatically passthru any supported format to the source
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file. If the source format is not supported, or not supported in the output
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container, the fallback encoder will be used. The default is AAC.
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