Unlock Seamless Audio Handbrake's ACC AVCodec vs. Passthru for Optimal Sound

SOURCE - English (AC3) (5.1 CH) AUDIO CODEC - AAC (FAAC) or (AC3 Passthru) MIXDOWN - As discussed in first post. SAMPLERATE - Set at Auto 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. HandBrake can pass thru several different audio formats. There are separate options the audio encoder dropdown for these. When you select “Auto Passthru”, it ... and even more when video is concerned. There's AAC, MP3, AC3, DTS, FLAC, WAV, TrueHD, Opus, and Vorbis OGG, just to name a few. We will ... In addition, HandBrake can passthru the following source audio track formats: AC3 and E-AC3; DTS, DTS-HD; TrueHD; AAC; MP3; Opus; Vorbis; TrueHD; FLAC; ALAC. 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 ... I stubbornly want to passthrough audio tracks when encoding,. I do NOT want to trash fine multichannel by downmixing to AAC or MP3 stereo. Please explain what it does to the audio to the video you encode and what the difference between the two is. 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. The test results indicate that this AAC encoder is transparent at 128 kbps and delivers equal or greater quality than most of other encoders. In ...