On Sat, Feb 2, 2019 at 9:32 PM Romain Beauxis <romain.beau...@gmail.com> wrote:

> There shouldn't be any chance on that part of the code. I'm happy to 
> investigate anything that looks wrong if you can share some of your script/a 
> way to reproduce.

Certainly. Happy to do so.

The difficulty appears when using crossfades. In Liquidsoap 1.3.6, the
"liq_amplify" annotation works as expected: the track level is
increased by exactly the amount given, whether or not the playlist is
passed through the crossfade function.

But in Liquidsoap 1.4.0-alpha1, the "liq_amplify" annotation, if
present, appears to result in much more gain than what is specified.
If it is absent, or set to 0, there is no change in gain.

Here is my test playlist of three short tracks. Each is recorded
quietly, so each requires an amount of gain. These are three extreme
examples, but all are measured properly.

annotate:liq_cue_in="0.000",liq_start_next="5.560",duration="312.060",liq_amplify="8.000dB":/home/john/src/radio/mez/204-zoot_sims-blue_room.PbTVdK.mka
annotate:liq_cue_in="0.800",liq_start_next="9.140",duration="286.840",liq_amplify="8.200dB":/home/john/src/radio/mez/02
Cha Cha Loco.FKMSrM.mka
annotate:liq_cue_in="0.100",liq_start_next="5.280",duration="162.080",liq_amplify="8.100dB":/home/john/src/radio/mez/12.Song
to Woody.wOgkma.mka

These two lines under the release version produce correct results:

myplaylist = amplify(override="liq_amplify", 1.0,
cue_cut(playlist(length=60.0, mode="normal",
"/home/john/src/radio/cha.m3u8")))
myplaylist = crossfade(fade_out=0.01, fade_in=0.01, conservative=true,
 myplaylist)

But under 1.4.0-alpha1, the addition of the second line produces way
too much gain. Under 1.3.6, it produces the correct amount of gain.
Is, perhaps, liq_amplifiy being applied twice, somewhere, in the
crossfade process in addition to the amplify process?

If you'd like to see full files, etc., please let me know. That will
be no problem.

with best wishes,
JW


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