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9th October 2017, 13:28 | #22221 | Link |
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No. DirectShow filters are registered in the system and as such only one can be installed/registered.
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LAV Filters - open source ffmpeg based media splitter and decoders |
9th October 2017, 13:55 | #22222 | Link | |
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So I guess you need to compile your own version with a changed identifier/name from the 0.65 source. |
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9th October 2017, 15:08 | #22224 | Link | |
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Is D3D11VA somehow not as well suited as DXVA2 for copyback? |
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10th October 2017, 18:57 | #22225 | Link |
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Guys can I get a recommendation as to the best way to downmix content to 2.0 output. My cheap 5.1 system gave out on me so I have gotten a set of LS50 Wireless and plan to attach a sub to its sub output, as I normally don't really make a lot of use of the surround information anyways.
I'm wondering whats the consensus on the best way to downmix the likes of 5.1 to 2.0 without losing any of the LFE information. I want to send the full range of output to the speakers and decide from there how best to transfer the lower frequency content. I have windows speaker configuration set to 2.0 and set that I have full range speakers (not that I think it even has any impact). I'm not sure which is best, to let windows mix whatever I throw at it, ie 5.1, down to 2.0, or use lav audios mixing to convert the 5.1 to 2.0. I know a lot of people use wasapi to try to avoid the windows mixer as its so bad. Is this still the case nowadays in Windows 10 and is using lav audio mixing + wasapi out from mpc still the best way to go? Note: Whats throwing me off about bypassing lav audio decoder and just using mpc audio renderer, set to exclusive wasapi, is that the lfe channel in any surround sound test clips I have tried from say Dolby, still seems to be getting mixed into the 2.0. Last edited by mark0077; 10th October 2017 at 19:08. |
10th October 2017, 19:43 | #22226 | Link | ||||
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L = (L + -3dB*C + -10dB*LFE + -1dB*SL + -8dB*SR) * -10dB These are weird coefficients that don't match the ITU BS.775 recommendation. I don't know why Microsoft decided to use these coefficients; maybe they're following different advice. As far as I know BS.775 is the standard to follow, which makes these coefficients wrong. This is the main reason why I use the LAV Audio mixer to downmix, not the Windows mixer. Quote:
(The only case I know of where the Windows audio pipeline would degrade quality in perceivable ways is back in the days of Windows XP, where IIRC people had legitimate complains about the resampler not being good enough. The pipeline was completely revamped in Vista.) I'm not sure what the problem is. If your sub is capable of handling it, then LFE should be included in the 2.0 downmix. |
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10th October 2017, 19:56 | #22227 | Link |
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Wow thanks for the replies e-t172, very informative. My only worry about LFE being detectable when using mpc audio renderer set to exclusive wasapi (lav mixer disabled), was that I thought in that case there was no mixer whatsoever involved, so I'm just confused as to whats mixing the LFE into the 2 channels in that particular case. Maybe its mpc renderer itself in this case (although i don't have it set to mix channels at all). I just want to know what pieces of software are involved in the various combinations. I'll use your approach of using lav audio to downmix and I'll use 0.71, 0.71 and 1.58 as recommended.
My main reason for trying to use wasapi in various cases (winamp / mpc) is so that I can play a mix of say 44.1khz and 48khz content, and my understanding is with wasapi there should be no conversion, where as without it, the mixer is converting to whatever I have set in windows sound settings. Thanks again. Last edited by mark0077; 10th October 2017 at 19:58. |
10th October 2017, 20:32 | #22228 | Link |
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It's used by the "Bass Management" feature available in the Enhancements tab in Windows' sound control panel.
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10th October 2017, 20:32 | #22229 | Link | ||
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Ah, that makes sense. I never used Windows Bass Management settings, so that explains why I couldn't tell what this option was for. Last edited by e-t172; 10th October 2017 at 20:34. |
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11th October 2017, 07:31 | #22230 | Link | |
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Alot of people and companies suggested different mixing coefficients. Some switch phase for the surround channels or even apply adaptive loudness correction to some or all channels, e.g. have the surround channels louder in general but attenuate them when the front channels get loud. So for now there's no reason to believe MS is doing anything wrong (here), they just use another method than the simplest one proposed by ITU. Regarding WASAPI vs DirectSound the former is definitely much harsher here and the latter softer. Not saying this has anything to do with quality. Actually DS sounds more pleasing to my ear. I guess MS is doing some polishing of the sound with DS (not that I'm aware of having any effects activated) but not with WASAPI. |
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11th October 2017, 09:58 | #22231 | Link | |||
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11th October 2017, 20:40 | #22233 | Link |
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DirectX 12 doesn't add anything useful for video.
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LAV Filters - open source ffmpeg based media splitter and decoders |
18th October 2017, 15:13 | #22234 | Link | |
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So one can see what MS tries to accomplish:
Last edited by mogli; 19th October 2017 at 07:16. Reason: addendum |
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19th October 2017, 14:35 | #22235 | Link |
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black screen (loss of HDMI handshake) on 3D movie stop.
Hi, started getting an odd problem recently, it either LAV or MADVR causing it but I cant decouple these to diagnose further. There seems to be a problem where changing back and forth from 1080p to 2160p and 3D I get a loss of handshake and I have to use DEVCON reset to get it back.
This is what happens (both KODI and MPC) I play a 3D movie, after a few seconds on a blank screen my TV switches 3D mode and plays the movies no problems. If I stop the movie the TV comes out of 3D mode and then I get black screen. If I put my HTPC into 1080p resolution this doesnt work so its something to do with how MADVR and LAV filters are dealing with refresh rate and resolution switching. Any ideas anyone? |
19th October 2017, 17:23 | #22236 | Link |
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That is not an area LAV interacts with. Actual output is not touched in any way, only decoded frames are being send onwards.
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LAV Filters - open source ffmpeg based media splitter and decoders |
19th October 2017, 21:19 | #22237 | Link | |
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When your screen is black and you go to 1080p, does it matter if your 1080p mode has a different FPS ? like 3D 2160p 23p -> stop -> 1080p24 or 1080p50 (does this work ?) From my experience, Madvr does handle changes in FPS very well, but if only other things change, like (2160p -> 1080p) or (3D -> not 3D) changes, it doesn't switch. What actually means no FPS changes -> no switching ! |
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20th October 2017, 10:43 | #22239 | Link |
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If copy back works and native doesn't, madshi will need to to investigate this. He'll likely want a sample.
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LAV Filters - open source ffmpeg based media splitter and decoders |
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decoders, directshow, filters, splitter |
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