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AC3 audio bitrate - VideoHelp Forum
https://forum.videohelp.com/threads/214053-AC3-audio-bitrate#:~:text=The%20bitrate%20for%20AC3%20varies%20depending%20on%20who,you%20would%20be%20hard-pressed%20to%20tell%20the%20difference.
Maximum Bitrate for AC3 Audio? - VideoHelp Forum
https://forum.videohelp.com/threads/216167-Maximum-Bitrate-for-AC3-Audio
You can compress lossless audio losslessly using a format such as flac, but it doesn't compress down anywhere near as much as a lossy format such as AC3. I'm not 100% sure what the AC3 limit is for stereo audio (to be compliant with the DVD spec) but I think it's 384kbps. It might be 448kbps, but even at 384kbps the quality should be pretty high.
Minimum suitable bitrate for 5.1 AC3 audio? - Doom9's …
https://forum.doom9.org/showthread.php?t=176573
It's "good enough" but it's not fully transparent. 384 Kbps will still lowpass filter a lot of stuff out. If you're using AC3, I say spend the full 640 Kbps. If you must save some space, 448 is a good compromise, and was often used on DVD. 384 is the minimum to get decent quality.
AC3 or AAC, which is better?
https://www.leawo.org/entips/ac3-vs-aac-1398.html
AC3 can carry 6 separate channels while Dolby Pro Logic provides the mix surround channel. AC3 is widely used in the laser disc and DVD limited between 384 kbps and 448 kbps. Besides, it is used for films at 640 kbps. AAC, also called as Advanced Audio Coding, is a lossy audio format defined by the MPEG-4 standard.
AC3 5.1 to AAC 5.1 Suitable Mode/Profile/Bitrate?
https://hydrogenaud.io/index.php?topic=95630.0
The AC3 to AC3 re-encoding question came as a benchmark comparative mean for me to choose my AAC encoding bitrate, since i now trust that AAC vbr quality preset 3 for 5.1 audio is pretty much equivalent to AC3 @ 384 kbps. However, your additional explanation of the lossy to lossy encoding flaws convinced me of taking the safe route (for me that is) and re …
Proposal to change default surround audio format and …
https://github.com/donmelton/video_transcoding/issues/270
--ac3-encoder ac3|eac3 set AC-3 audio encoder (default: eac3) --ac3-bitrate 384|448|640|768|1536 set AC-3 surround audio bitrate (default for ac3: 640; default for eac3: 384) So, to get the current behavior, only --ac3-encoder ac3 would be required on the command line.
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