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15th August 2006, 17:42 | #381 | Link |
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for encoding ac3 to aac via megui, where ac3 is 192 kbps ac3 (cantonese original mono), should i go for keep original channels or convert to mono? i use force decoding via dshow, and in ac3filter, "AS Is" decoding...
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17th August 2006, 12:12 | #384 | Link |
clueless n00b
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@dimzon: looking at people reporting low audio in megui I decided to have a look at the avisynthaudioencoder and compare it with what the trusty old besweet does.
I found the following differences: besweet performs DRC. We now have DRC in nicaudio as well so I think it makes sense to use it. besweet uses gain (be it hybrid or postgain, depending on the audio format), whereas the increase volume option in megui is a 100% normalization. I suspect we'd get better results by analyzing the samples read during the first pass, and compute a DB gain, then write a new script with the amplifydb command in it. Do you think that's doable?
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17th August 2006, 12:20 | #385 | Link | |
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Quote:
Actually I think we need to write Yet another Avisynth filter to perform non-linear DRC (like besweet's DSPguru/Ligh/Tera) add: this is sample http://www.ligh.de/software/booster.zip
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BeHappy - AviSynth-based audio transcoding tool Audio encoding via AviSynth On2 VP7 is great in quality but it is unusable for long-term video backup puposes! Sincerely Yours, MCPD/MCTS Last edited by dimzon; 17th August 2006 at 12:31. |
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17th August 2006, 12:39 | #387 | Link | |
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Quote:
AFAIK Normalize perform scan and compute Max peak value at first pass. Than it compute amplification factor as (factor * AbsoluteMax/FoundMax) and perform amplification on second pass...
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17th August 2006, 12:45 | #388 | Link | |
BluRay Maniac
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17th August 2006, 13:11 | #389 | Link |
clueless n00b
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Actually, Hybridgain does the following: apply a 10dB gain at the input, encode while finding the maximum possible gain, then apply that gain as postgain after encoding.
If normalize was the same as finding and applying the maximum gain , why are the results so different in between using besweet vs behappy?
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17th August 2006, 13:32 | #390 | Link | |||
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Quote:
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Boost (non-linear DRC) can be a option, but I never recommend use boost transcoding ac3 -> aac. Quote:
@shon3i ReplayGain don't work properly with ac3 5.1 like I say in this post I make many test with AviSynth Normalize and never the aac output volume is less than ac3 input volume. |
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17th August 2006, 13:42 | #391 | Link | |
BluRay Maniac
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Quote:
in this case RG works very good. |
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17th August 2006, 16:01 | #392 | Link | |
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Quote:
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17th August 2006, 16:47 | #393 | Link | ||
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Then HybridGain is a PreGain limited (< 100%), and after a PostGain to reach the 100% (or less) in formats than accept this. PreGain 100% is equal to HybridGain +- 2 dB, then HybridGain is more accurate than PreGain/Normalize but don't justify any volume difference. And any difference can't be previewed before the encode phase (with RG over the ac3 input) |
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17th August 2006, 16:52 | #394 | Link | |
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Quote:
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BeHappy - AviSynth-based audio transcoding tool Audio encoding via AviSynth On2 VP7 is great in quality but it is unusable for long-term video backup puposes! Sincerely Yours, MCPD/MCTS |
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17th August 2006, 16:56 | #395 | Link | |
BluRay Maniac
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@all can somebody check aacgain/avsamp (AviSynth ampifler) metod because works same as RG from foobar. Last edited by shon3i; 17th August 2006 at 17:01. |
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17th August 2006, 17:07 | #396 | Link | |
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Don't worry (be happy) with this problem. Is not a encoder problem, forget boost, non-linear DRC, ... We need an aac 5.1 decoder, a new Bepipe (without header errors like first BeHappy) before than boost. |
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17th August 2006, 17:18 | #397 | Link | |
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Why not just use DShow to decode 5.1 AAC? Actually I never transcode FROM AAC IRL... Why do You need bePipe? Do you want to write batches?
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17th August 2006, 17:37 | #398 | Link | ||
BluRay Maniac
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17th August 2006, 18:08 | #399 | Link | ||
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You don't have problems with MEGUI DShow input? Quote:
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