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4th October 2012, 15:11 | #12261 | Link |
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Just so I got this right:
Clipping protection doesn't do any dynamic compression, it's just a "smart/automatic" static normalizer that updates its normalization factor if/when clipping occurs. (And it never increases volume, it only decreases when necessary (unless you count adding 5 channels without dividing by 5 as increasing the volume).) Would it be possible to remember the normalization factor when seeking, so the volume doesn't suddenly go back to "normal" when you didn't hear a word and rewind by 5 seconds? |
4th October 2012, 15:53 | #12262 | Link | |
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I was meaning to do that, as someone else also suggested it before, it'll be in the next version.
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LAV Filters - open source ffmpeg based media splitter and decoders |
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4th October 2012, 16:03 | #12264 | Link |
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I use "don't mix stereo sources" and "clipping protection" only. All of my TV channels (SD, HD, 2.0, 5.1) are all the same volume (aside from natural minor discrepancies between channels).
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4th October 2012, 16:28 | #12265 | Link | ||
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Matrix Normalization off, with Clipping protection will usually give you a constant volume between different files, and only rarely does it have to lower the volume mid-playback to avoid clipping. When matrix normalization is active, clipping protection does usually not do anything - because the normalization ensures nothing is clipped. The default settings usually are what most people prefer, in this case clipping on, matrixnorm off. Quote:
The only case where this option comes in useful is if you select mixing to 5.1 output (downmix 6.1/7.1), and you play a stereo file. Without the option active, it would output 5.1, with stereo in the front channels, and everything else silent. With the option on, no mixing is performed, and stereo is output as-is (just two channels, no silent channels).
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LAV Filters - open source ffmpeg based media splitter and decoders Last edited by nevcairiel; 4th October 2012 at 22:09. |
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5th October 2012, 08:58 | #12267 | Link |
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Typos happen. :P
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5th October 2012, 18:39 | #12268 | Link |
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May I once again ask them to fix incorrect display of the mixing coefficient LFE channel in the LAV Audio mixer.
Test file wav 5.1: Link When I mix this file in stereo (not LAV), from the matrix: Lt = 100*L + 0.7071*C + 0.7071*LF + 100*SL Rt = 100*R + 0.7071*C + 0.7071*LF + 100*SR The correct result is as: Image If I select to LAV Audio mixer similar parameters: Center Mix Level 0.7071 Surround Mix Level 1.0 LFE Mix Level 0.7071 in registry: MixingCenterLevel 1b9f(7071) MixingSurroundLevel 2710(10000) MixingLFELevel 1b9f(7071) I get the wrong result, level LFE channel too low: Image Correct result (0.7071) is obtained only when I put the level of LFE channel in LAV Audio mixer to 1.0: Center Mix Level 0.7071 Surround Mix Level 1.0 LFE Mix Level 1.0 in registry: MixingCenterLevel 1b9f(7071) MixingSurroundLevel 2710(10000) MixingLFELevel 2710(10000) Image Sorry, if my English is bad. |
5th October 2012, 18:51 | #12269 | Link |
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To make it more user-friendly i should instead change the Center value, so that 1.0 always means "original volume", and the channel duplication factor is calculated in afterwards. How would a normal user know that 0.7071 means "original volume"?
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6th October 2012, 00:45 | #12273 | Link |
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It's also wrong.
I said a while ago there should be a "default" button that'll return things to 0.7071 (or this should happen when changing the speaker output). Another issue with that dialogue box is that unticking "enable mixing" should grey out the other relevant controls but it doesn't right now.
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6th October 2012, 13:53 | #12275 | Link |
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i also want "1" for original volume.
with "original" i mean that the same signal on all channels has the same db and maximum possible peak is 0db. here is my selfmade test ac3 with same volume on all channels (all 5 wavs had same peak db and then encoded with encwavtoac3): http://www15.zippyshare.com/v/54111956/file.html http://ul.to/7pwd3gl4 http://www.share-online.biz/dl/ERF43HBMTP http://www.load.to/l8Povkw3SF/SameVolumeOnAllChannels.ac3 http://netload.in/dateiKMtpOmrwqk/SameVolumeOnAllChannels.ac3.htm Last edited by thomaz909; 6th October 2012 at 14:17. |
6th October 2012, 22:36 | #12276 | Link | |
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7th October 2012, 17:14 | #12277 | Link |
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Decode only the core
First of all, gotta say, I think LAV filters is excellent and has now replaced all my other splitters and decoders on my HTPC, so thank you!
Does anyone know, is there a way to set LAV up to decode only the 'core' when presented with a DTS-MA or True-HD audio track rather than the full HD audio? Basically, by HTPC is underpowered and my main aim is for it to be quiet. When it goes above 30% CPU the fans kick in and it gets a little too noisy. If I watch a 1080p source with AC3 audio then all is well, but when I watch a 1080p source with HD audio then this taxes my PC a little more (40-50% CPU) and the fans kick in. As I only my HTPC connected to my TV I would like to set it up so that when presented with a HD audio stream, instead of downmixing the HD audio to 2 channel, it downmixes the 'core' DTS or 'interleaved' AC3 instead. Anyone know if this is possible with LAV? |
7th October 2012, 18:28 | #12278 | Link | |
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7th October 2012, 19:56 | #12279 | Link |
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Nev, i noticed that enabling YADIF will cause problems with DVD navigation menu :/
Butons fail to highlight. Disabling YADIF fix it.
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7th October 2012, 21:54 | #12280 | Link | |
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x86: http://files.1f0.de/lavf/LAVFilters-...6-g1de6191.zip x64: http://files.1f0.de/lavf/LAVFilters-...de6191-x64.zip It seems to fix the issue for me, hopefully without crashing or causing other issues in the process. As a bonus, during normal playback YADIF should no longer "eat" the last frame, either.
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LAV Filters - open source ffmpeg based media splitter and decoders Last edited by nevcairiel; 7th October 2012 at 21:59. |
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decoders, directshow, filters, splitter |
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