Real-time 432hz Audio Auto-Pitching (Page 1 of 2)

The right command to use to alter the pitch without changing the frame rate is
TimeStretch(pitch=100.0 * 0.981818)

I tried ReClock and haven't seen any such option.

Mystery
I made demonstration how you can use ReClock to get 432 Hz audio from 440 Hz in realtime.
https://youtu.be/zD2gwTC__jE

Several rules.
1. You need to add custom resolution to your display. Different for each source framerate. In video shown example with 25 fps source.
2. You need to check if your audio really 440 Hz base frequiency. It is needed to use some frequency analyzer.
3. Slowdown can be applicable mainly for instrumental music but not for voice or sounds of nature. It this case sounds are real when pitch is 1.00x at source speed.

Calculations and explanations.
25 fps soucre. Integer mutipliers 2 and 3 gives numbers 50 and 75.
I take 75 Hz and slow down it with 432/440 ratio. I got 75*432/440 = 73,636 Hz.
I used NVIDIA control panel to add this custom resolution (and frequency) to one of my monitors.
I allow ReClock to use 3% slowdown. So I got new sample rate in ReClock for 44100 Hz audio: 43296 Hz.
Make some test with calculation real ratio: 43296 / 44100 = 0,981769 It is very close to yours 0,981818.

Really?  I was under the impression that there was little difference architecturally between Ivy Bridge and Haswell's iGPU, and I've been running custom resolutions over 60Hz on my Pentium G3258 for a while now..

The resample in ffdshow is different?

mashingan, I tried it. That didn't make any difference for me. Perhaps the audio isn't being processed by ffdshow? Adding "ffdshow Audio Decoder" in MPC-HC's external filters doesn't help.

And if it did, what about 48000hz sources?

Here's the AviSynth code that's working best so far

PluginPath=""
LoadPlugin(PluginPath+"ffms2.dll")
LoadPlugin(PluginPath+"TimeStretch.dll")
SetMTMode(3,4)
FFmpegSource2(source="Input.mp4", atrack=-1, cache=false, threads=1)
SetMTMode(2)
ResampleAudio(48000)
SemiTone = -0.3176665363342977
TimeStretchPlugin(pitch = 100.0 * pow(2.0, SemiTone / 12.0))

Which requires these 2 DLLs
http://avisynth.nl/index.php/FFmpegSource
http://forum.doom9.org/showthread.php?p … ost1722472

mashingan
I checked Resample option in ffdShow Audio. Pitch is not corrected for me. I see only speed changes. Very little when change and back after some seconds after.
So. The pitch not changed form 440 Hz to 432 Hz.

Yeah, I didn't really realized until you mentioned it.

I tried TimeStretch but ffdshow_source() only contains the video not the audio, so TimeStretch complains the clip has no audio.

While what I could think of is to use DirectShowSource to load audio only in complement to ffdshow_source(), I prefer to load it using ffdshow too as Mystery mentioned above.

Maybe in LAVfilters, try to disable all the output formats except YV12?

Somehow I got 58.943 Hz at my monitor and 43312 / 44100 = 0.982131 pitch ratio.
It gives me 440 Hz * 0.982131 = 432,13 Hz

50 fps at the picture it is 2x smoothing after SVP.

I tried that and it didn't work.

Here's one video that fails
https://www.youtube.com/watch?v=Nwh3Kc-Nta0

Here are the streams I have downloaded

Video: MPEG4 Video (H264) 854x480 29.97fps 1082kbps [V: h264 main L3.1, yuv420p, 854x480, 1082 kb/s]
Audio: AAC 44100Hz stereo 253kbps [A: SoundHandler (aac lc, 44100 Hz, stereo, 253 kb/s)]

When playing through the AVS script, here's how MPC-HC sees the streams

Video: I420 854x480 29.97fps [V: rawvideo, yuv420p, 854x480]
Audio: IEEE Float 48000Hz stereo 3072kbps [A: pcm_f32le, 48000 Hz, 2 channels, fp32, 3072 kb/s]

It is already disabled. The problem is that AviSynth returns IEEE Float which must then be converted by the player. Not sure how to get AviSynth to return it as Int audio.

And I doubt this is the problem because this applies to every videos, and 96% of them play just fine.