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Obviously the other reason for DD+'s popularity is Dolby Atmos support, which is unavailable in AC-3.Īnyway, DD+ at 384 Kbps seems to be the sweet spot, the best compromise between size and quality. Here are the (more or less merged) surround bitrate guidelines from Apple and Roku for AC-3 and DD+: Channels Why is DD+ so popular? Because you can get as good or even better quality with DD+ at half the bitrate of AC-3.ĭid you know that all the streaming services use 5.1 DD+ at only 192 Kbps as their default, stepping up to 384 Kbps if you have a better connection and sometimes 640 Kbps if you have bandwith for video at 10 Mbps or more? Which means those media files with surround audio that you "acquired" from your Uncle Torrance (you know who I mean!) are in DD+ format. In fact, Netflix uses DD+ exclusively for surround audio. It's also clear that streaming services prefer DD+ as their surround format. In fact, that transition has already happened.
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:(Īnd it's clear that the PC, mobile device, TV and home theater industries are now supporting DD+ decoding or passthrough pretty much everywhere. But, other than desktop PCs, native 5.1 AAC support is only available on some Android-based devices while 7.1 support is essentially non-existant. I had hoped that we could transition to multichannel AAC audio since HandBrake and FFmpeg can already create 7.1 channels with it. And wouldn't it be nice if we could do that and improve quality at the same time? So, our audio footprint needs to get smaller. While this strategy is "portable," it has never been a good way to achieve my original "smaller" goal for the project.
#Is 448 kbps good for audio 1080p#
And that's a combined bitrate of over 13% of our 1080p target. transcode-video creates two output tracks, one in 5.1 AC-3 track at 640 Kbps and one in stereo AAC track at 160 Kbps. What's even crazier is when you consider that, by default, each surround track is duplicated, i.e. And that bitrate is more that 10% of our target video bitrate for 1080p content. Achieving transparency with it requires using close to its maximum bitrate of 640 Kbps. :)ĪC-3 is an ancient audio compression format, even older than MP3. Not to somehow disallow AC-3 at 640 Kbps. Please remember that I'm only proposing that we change the default. And I want to do that sooner rather than later. It is inevitable that our default surround audio format and bitrate will change.
#Is 448 kbps good for audio plus#
Let me just cut to the chase.:) I propose that the default 5.1 surround audio format and bitrate of transcode-video be changed from Dolby Digital (AC-3) at 640 Kbps to Dolby Digital Plus (DD+ or E-AC-3) at 384 Kbps. Proposal to change default surround audio format and bitrate