[HELP] how to encode variable bitrate AAC audio?

[HELP] how to encode variable bitrate AAC audio? - Printable Version

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how to encode variable bitrate AAC audio? - ssdde - 06.06.2021

a MP4's audio is E-AC3, when enable cut suppoort, then encode, Hybrid displayed error, so i have to encode with AAC, but audio settigns only have bitrate and Quality factor two options.

can i encode with variable bitrate AAC?

RE: how to encode variable bitrate AAC audio? - Selur - 06.06.2021

Quote:a MP4's audio is E-AC3, when enable cut support, then encode, Hybrid displayed error

Not sharing the error message -> nothing I can say about it. Mp4 itself nowadays does support e-ac3 muxing, but there might be a but with the detection on passthrough,...

Quote:can i encode with variable bitrate AAC?

Sure,... you just have to either use an encoder which allows to encode to vbr with a given bit rate or which allows to encode using a quality factor.
All the aac encoders (qaac, fhg, faac, NeroAac, fdk, ffmpeg) support one of these options.

Cu Selur

RE: how to encode variable bitrate AAC audio? - ssdde - 06.06.2021

yes, i set audio passthrough, but hybrid hints error, can't support EAC3 in cut.

audio that only can be set one of bitrate or QF, and there are no variable bitrate options, in bitrate, only can be set a number, no variable bitrate.

[Image: XRS8QGjYxWhCDZM.jpg]

RE: how to encode variable bitrate AAC audio? - Selur - 06.06.2021

Quote:yes, i set audio passthrough, but hybrid hints error, can't support EAC3 in cut.

Okay, I give up on that since you really don't want help other wise you at least would have shared the error message.

Quote:audio that only can be set one of bitrate or QF, and there are no variable bitrate options, in bitrate, only can be set a number, no variable bitrate.

Atm. you are using ffmpeg aac encoder which only offers vbr through setting a target quality factor.
Qaac would allow to encode to vbr using cvbr (=constained variable bitrate) with a bit rate or by setting a target quality factor.
FHG (which you don't have) and FDK would allow to encode to vbr (mode) by setting a target bitrate.
FAAC and Nero AAC like ffmpeg offer vbr through setting a target quality factor.

Cu Selur

RE: how to encode variable bitrate AAC audio? - ssdde - 07.06.2021

OK, thank you