Re: [whatwg] VIDEO and pitchAdjustment

On 11/12/15, Philip Jägenstedt <> wrote:
> On Thu, Nov 12, 2015 at 9:07 AM, Garrett Smith <>
> wrote:
>> On 10/19/15, Philip Jägenstedt <> wrote:
>> > On Tue, Sep 1, 2015 at 11:21 AM, Philip Jägenstedt <>
>> > wrote:
>> >> On Mon, Aug 31, 2015 at 9:48 PM, Domenic Denicola <>
>> >> wrote:
>> >>> From: Eric Carlson []
>> >>>
>> [...]
>> > I've filed a spec issue to make it so:
>> >
>> >
>> > If there's any implementor interest in pitch control that goes beyond
>> > (independently) or that, please file a separate issue.
>> >
>> They won't.
>> You can hold the standard of "they need to come here and post up
>> cogent arguments in favor of feature X", but it ain't gonna happen
>> that way.
>> There just isn't a whole lot of money in music education. How many
>> music education companies are W3C members?
>> Unlike technology companies like Facebook, Google, Nokia, Opera, and
>> other companies the post here, small music education operations like
>> artistworks, jammit, licklibrary, etc are more about their domain —
>> "music" — than they are about technology.
>> Major music education websites are still using Flash; their developers
>> are busy fixing broken links, making the login feature, database, etc
>> work, etc. Flash is not nice but they apparently were not funded or
>> motivated enough by the existing HTML5 HTMLMediaElement to use it
>> instead.
>> Control over playbackRate has a greater value than pitch control. But
>> those sites don't even allow the students to change the playbackRate
>> because they're still using Flash.
>> You won't read posts here about what students have to say about it the
>> value of having HTML5 vs Flash, or independent control over pitch and
>> playbackRate.
> Have you investigated whether you can achieve your use cases using the
> Web Audio API? If it isn't possible, is there a small addition to Web
> Audio that would solve the problem?

> It is unfortunately quite hard to get all browser vendors (or even
> one) interested in implementing support for something that is only
> expected to benefit a niche use case, but we should strive to make
> available the primitives that would it possible to implement yourself.

The situation where you want hear the audio at the desired pitch,
while simultaneously watching the video at the desired speed, to see
it performed, and to play along. It doesn't work well when trying to
play to a video example, such as playing an open G chord, and the
sound from the video does not match the sound from your own guitar.

What I can do now on websites that use VIDEO, such as YouTube, is
limited to using the web inspector (console). I click "inspect
element" to find the VIDEO element, then change its DOM properties for
playbackRate = .95 and mozPreservesPitch = false. That'll get
everything down a half-step (although at 95% speed).

For example, watch Andy James play "Harvester of Sorrow" but hear it
1/2 step down:

1) Right click on the video "Inspect Element"
2) Right click on the VIDEO in the HTML tab. Choose "Show DOM Properties"
3) set playbackRate: 0.95, mozPreservesPitch: 0

Ed Van Halen, Yngwie Malmsteen, Jimi Hendrix, Zakk Wylde, to name a
few tune down 1/2 step. Others, Black Sabbath, Racer X, have tuned
down further.

A=440 (standard tuning) is much more common. When you want to learn
something played tuned down 1/2 step and your guitar is in standard
tuning, it is a problem. Constantly retuning the instrument is not
practical. Especially for guitars with locking nut systems or for
other instruments like piano. I don't know about learning horn parts.
Or you can buy multiple instruments and maintain different tunings for

Fast passages, it's helpful to slow the speed down but keep the pitch
as original and in some cases, you want to slow the speed down and
adjust the pitch separately, so you can do things like learning Yngwie
Malmsteen songs while using a guitar in standard tuning.

I realize there's not much demand for it. But there seems to be
separation of playback pitch with `preservesPitch` and `playbackRate`.
It would be much better with a control to adjustm pitch, if it is not
too much work.

Thank you,

Received on Thursday, 12 November 2015 18:56:16 UTC