Audiophiles Unite HandBrake ACC vs ACC Passthru, Revealed

The default codec for audio is AAC avcodec, but under Track Selection you can select other codecs for audio passthru, such as MP3, AC-3, EAC-3, ... I can't get right the audio passthrough setting for handbrake. Basically I want the audio to be untouched. These are TV recordings so it's ac3. AAC is the default or standard audio format for iPhone, iPod, iPad, Nintendo DSi, Nintendo 3DS, Apple Music, iTunes, DivX Plus Web Player, PlayStation 4 and ... For audio, "Auto Passthru" doesn't get selected anymore when set in behavioural rules. It'll pick the actual track it's going to choose on the ... In which sense? The Passthru or the choosing in iTunes? Let's go back to basis then, explain your process and where you don't get Dolby Digital ... In Handbrake, when I transcode mp4 to mkv, the output file is missing audio if I set the audio codec to AAC (FDK) or to AC3. When encoding source file to h.264 constant quality 32, AAC audio (avcodec), the audio has noticeable muffling every half a second or so. It's ... Set the audio to passthru. No sense trashing it just to save a few MBs. AC-3 is a lossy codec and by changing it to AAC or something else you ... Mit der Option "passthrough" werden Audio- bzw. Videospuren unverändert in die Zieldatei kopiert. Die 5.1 AC3- oder AAC-Audiospur ist relativ ... SOURCE - English (AC3) (5.1 CH) AUDIO CODEC - AAC (FAAC) or (AC3 Passthru) MIXDOWN - As discussed in first post. SAMPLERATE - Set at Auto