FFMPEG AAC Native VBR Quality questions 2016-05-28 05:21:46 Hello. I'm new at this forum but I need some help from you experts.For some reasons I can't detail quickly, I have to use ffmpeg as my encoder/decoder.As amazing Opus is not yet compatible for lots of hardwares, I'll have to stick with AAC-LC to encode my family videos and keep them with quality.What happen is: I have to batch-transform all my videos that come from the camera because it's audio bitrate is not configurable. It comes with DCA (DTS Audio) and something as ~384KbpsAs I want to save space and keep the best quality possible without noticing audio artifacts, I decided to use 192kbps as my ~max Kbps.THE PROBLEM: Using CBR is easy in ffmpeg. -b:a 192k and it`s done. But that wastes space, so I wanted to use VBR that would max around 192-224Kbps. For the life of me I can't understand still this day how the -q:a ranges work.In some sites it says 0.1-2 , others 0.1-10, others 0-100 ... I don't know what to believe, and testing the parameters with the video brings unpredictable results. In some cases -q:a 0.3 brings it perfectly to around 192Kbps, in others drops to 64Kbps...- Can anyone explain me exactly what those numbers mean?- If I use -q:a 0 (zero), what that does?- If I just wanted to switch to DCA to AAC-LC without losing quality/bitrate, is there a VBR command in ffmpeg to do this?THANKS A LOT!