[LAD] Replaygain for video?

[Philipp Überbacher]

Quoting Robin Gareus (2011-12-11 14:27:35)
>On 12/11/2011 01:19 PM, Fons Adriaensen wrote:
>> On Sun, Dec 11, 2011 at 12:49:10PM +0100, Robin Gareus wrote:
>>  
>>> For comparison, ebur128 reported:
>>>   Loundness-range 19.1 LU; Peak 6.7 LU for the Chaplin movie.
>>> and
>>>   Loundness-range 11.3 LU; Peak 15.3 LU for the youtube video,
>> 
>> ?? ebur128 does not report anything called 'Peak' in LU.
>
>No it does not. "Momentary max" did not fit in the line w/o line break
>in my mailer :)
>
>> The relevant values are the first two: 'Integrated loudness'
>> and 'Loudness range'. The first should determine any gain
>> correction, the second can be used to decide if some com-
>> pression would help. 
>> 
>> The last two, 'Momentary max' and 'Short term max' (I guess
>> one of these is what you call 'Peak') are for information
>> only and should not be used for the purpose discussed in
>> this thread.
>
>Thanks for the clarification. So let me correct that:
>
>The Great dictator DVD has an
> Integrated Loudness of 4.1 LU, Loudness Range 19.1 LU.
>
>and 'Music for one appart. and 6 drummers' from you-tube:
> Integrated Loudness:  12.9 LU, Loudness Range 11.3 LU
>
>Both are already normalized to 0 dbFS.
>
>
>Checking some more, revealed that you-tube does not actually normalize
>audio volume automatically: e.g.
>http://www.youtube.com/watch?v=hJMEvDu0K2E peaks at -16.5 dbFS
> Integrated Loudness: -1.7 LU, Loudness Range 9.9 LU
>
>> Updates of ebur128 will show only the first two, unless
>> you explicitly ask for the others as well.
>> 
>> Ciao,
>> 
>
>Cheers!
>robin

Thanks everyone,
sorry for the late answer, I had a combination of email client trouble
with Christmas stress among other things.

It would be very nice if at some point youtube would use such a system.
It's rather common today that people use youtube playlists instead of
local music. This could at least solve the problem of different volume.
Anyway, I won't be implementing replaygain at this time, but I still
think it's worth doing. Maybe I'll pick up the idea some other time or
someone else does.

For the project I decided to go with the ecasound GUI. The plan is to
write the GUI using JUCE. The minimal set of goals is, well, minimal,
but I have a few ideas, I'll see where to got from there. No idea how
usable it will become. Ecasound sure could use a GUI other than the Tk
thing nama provides. Imho ecasound has also become more interesting
with the recent addition of LV2 support.

Thanks everyone for sharing your thoughts,
I wish you happy holidays.

Regards,
Philipp