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I'm curious as to the best audio codecs to use for my video files to have Emby direct play them on my Roku Ultra. At the present time, my Roku is connected to my TV via HDMI. I hope to add a home theater setup later that will be able to handle surround sound. For now, my videos are h264 or HEVC and mostly in mkv containers. Many have AC-3 5.1 though a growing number have AAC 5.1 for audio. I've noticed on my Emby dashboard that when I'm playing these files, the files that have AAC 5.1 show "Direct Playing" on Emby while the ones with AC-3 5.1 always show transcoding. I've tried converting just the audio from 1 format to the other leaving the video the same and Emby will direct play the AAC files while transcoding the AC3 files. I was just curious as to why that would happen and if there is something in my Roku and/or Emby settings that I need to review and possibly change. If I was never going to add a home theater system down the road, I would just roll on using AAC surround for all files. However, no A/V receivers are able to decode AAC surround. Some have the ability to change these to LCPM 5.1 which would be okay, but it looks like Dolby Digital would be the preferred audio format with the future home theater setup in mind, but everything seems to run more smoothly on a consistent basis if I can direct play my video files and at present, that seems to only work with AAC files. I believe Roku downmixes all AAC surround audio tracks to 2.0 anyway so maybe that has something to do with Emby direct playing AAC 5.1 while transcoding AC3 5.1. I can't post logs or anything at the moment since I'm at the office and not at home. I'm hoping there is a fairly simple answer to this, but I have no idea if that will be the case! Thanks.