With Windows 10 I have never been able to achieve bitstreaming using LAV filters. All audio formats specified for bitstreaming in LAV Audio passed through in the correct format to my AV Receiver. It worked well and was (at the time) about the only way to reliably process multi-channel AAC. It's been a while since I used Windows 7, and things may have changed with more recent versions of LAV filters, but in Windows 7 with MPC-HC and PotPlayer I have in the past used either ffdshow audio processor or AC3Filter to post-process PCM audio (from decoded AAC) to AC3 on the fly. Bitstreaming doesn't work if you use ffdshow audio processor or AC3Filter. It should in theory be possible for LAV to extract the core AC3 to bitstream it over SPDIF (but that would mean an additional step where LAV would have to analyse the E-AC3 stream to determine if it's a broadcast-style pure E-AC3 that needs to be 'repackaged' or a Blu-ray style AC3+E-AC3.Ĭheck which filters are used by MPC-HC. (Edit: the paper specifically mentions broadcast in this scenario, so I'm wondering if maybe this would only be possible for E-AC3 streams lower than 640 Kbps, like found on TV or streaming platforms)Įdit 2: my bad, I haven't fully understood read the paper I linked to: apparently on Blu-rays, E-AC3 *is* made up of a core AC3 stream + an E-AC3 extension. I have no idea how that is done nor how that can be high quality as claimed by Dolby, but it's still processing so the decoder has to do some work, you can't simply use the core track directly like with DTS or the companion track like with TrueHD. Introduction of compounding coding artifacts Not decode the signal to PCM and reencode it, therefore avoiding the Standard Dolby Digital format at 640 kbps. The 640 kbps bit rate, which is higher than the standard 448 kbps used on DVDs, is fully compatible with all existing Dolby Digital decoding products such as A/V receivers, and can provide higher-than-DVD quality from Dolby Digital Plus soundtracks when played back through existing systems."īy means of an elegant conversion process, Dolby Digital Plusīitstreams, regardless of their source bit rate, are repackaged into a Dolby Digital Plus soundtracks are easily converted to a 640 kbps Dolby Digital signal without decoding and reencoding, for output via S/PDIF. "Is Dolby Digital Plus content backward-compatible?īecause Dolby Digital Plus is built on core Dolby Digital technologies, content that is encoded with Dolby Digital Plus is fully compatible with the millions of existing home theaters and playback systems worldwide equipped for Dolby Digital playback. It seems the MS DVD decoder is simply passing the AC3 core via SPDIF as per the DD spec below. LAV sends the core DTS/DD streams from DD-HD and DTS-HD via SPDIF, should it not send the core stream in an EAC3 via SPDIF? EAC3 is becoming very popular and some of us have yet to swap to HDMI equipment just yet. AC3 and DTS are bitstreaming fine and I can bitstream HD content as it sends the core component over SPDIF as expected. I am using SPDIF however the core stream should work fine over SPDIF, i.e send the core AC3 component as per the DD spec. If even plain AC3 and DTS are not working then you need to select correct audio device in output settings of MPC-HC. If you are using S/PDIF then you should only enable AC3 and DTS. Older version fall back to using MS decoder it means bitstreaming failed then as well.
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