Importing MOV with multichannel audio

HI all, I need to do an audio edit with a picture reference. The MOV file has 18 audio tracks. Importing into Reaper, the first audio track appears, and the video plays fine, but I can't work out where the other 17 audio tracks are. Help! Many thanks.....

Is it a single file with 18 channels or should it be 18 separate tracks? Did you try setting the Master I/O settings to have 20 outputs? (just a guess)

I can't believe this question hasn't been for 5 years. I was searching for related threads, but with no succsess. I have mov file recorded with OBS that has multichannel audio and if I import video in premiere I get 4 separate audio tracks. If I import it to REAPER i get standard stereo file. In source properties of the video says there are only two channels, so when I change Channel mode to Stereo 3/4 I get silence. I this a bug or is there really no way to do this inside reaper?

4-Channel MOV in Reaper 6.05 ? Or workaround? 

Currently, Reaper only opens the first mono or stereo audio channel of a multi-audio video file. There are various, free third-party utilities that can de-multiplex those audio streams from the video file and save them into separate files. I'm on Windows. The apps I mostly use for this purpose are FreeAudioVideoPack and AVIDemux. However, they can only extract one audio stream at a time. In contrast, YAMB can extract all video and audio streams at once but only if the source video file is AVI, MPEG2, MOV, 3GPP or MP4 (not MKV; use Video Container Changer or AVIDemux to losslessly transcode MKV to MP4). For mac, you may wanna search the internet for "batch extract multiple audio from video on mac" or similar. .

none of this sounded right to me so i just used ffmpeg to make a test mov file with six channels of audio and dragged it straight to a new reaper track in a new project. reaper set the i/o to six channels automatically and displayed all six channels. then was able to use action 'explode multichannel audio...' (or something like that) and reaper created six child tracks below the original multichannel, each track with a mono item, one for each channel. using v6.04/64 here and running in linux. babag

thanks for the info, babag. I doesn't seem to work at all on Windows, though. I just tested several Reaper versions and the latest dev build. The result is always the same: Only the first audio stream (mono or stereo) is displayed and item properties state 2 channels of audio where there are actually 2 stereo streams. btw, did you test it with different/mixed audio formats like PCM, mp3 or aac? Are specific preferences settings required to make Reaper recognize multiple audio streams in a video file? EDIT: Ah, maybe Reaper can recognize surround sound audio formats (5.1). But it definitely seems to ignore multiple audio streams if their no. doesn't match that of a common surround format. .

Multiple streams and multiple channels are two different things! Reaper suports multichannel audio in video files, but does not support multiple streams - only the first stream is imported (be it mono, stereo or 6 channel,...)