From 18a80c10f15d1f8ef995697d261e73f9bf0e6085 Mon Sep 17 00:00:00 2001 From: Andrew Weaver Date: Mon, 7 Aug 2017 11:23:41 -0700 Subject: [PATCH] add sample rate flag --- index.html | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/index.html b/index.html index 0a002fa..aaac1d0 100644 --- a/index.html +++ b/index.html @@ -1166,7 +1166,7 @@

One Pass Loudness Normalization

-

ffmpeg -i input_file -af loudnorm=dual_mono=true output_file

+

ffmpeg -i input_file -af loudnorm=dual_mono=true -ar 48k output_file

This will normalize the loudness of an input using one pass, which is quicker but less accurate than using two passes. This command uses the loudnorm filter defaults for target loudness. These defaults align well with PBS recommendations, but loudnorm does allow targeting of specific loudness levels. More information can be found at the loudnorm documentation.

Information about PBS loudness standards can be found in the PBS Technical Operating Specifications document. Information about EBU loudness standards can be found in the EBU R 128 recommendation document.

@@ -1174,6 +1174,7 @@
input_file
path, name and extension of the input file
-af loudnorm
activates the loudnorm filter with default settings
dual_mono=true
(optional) Use this for mono files meant to be played back on stereo systems for correct loudness. Not necessary for multi-track inputs.
+
-ar 48k
Sets the output sample rate to 48 kHz. (The loudnorm filter upsamples to 192 kHz so it is best to manually set a desired output sample rate).
output_file
path, name and extension for output file

@@ -1190,7 +1191,7 @@

Two Pass Loudness Normalization

-

ffmpeg -i input_file -af loudnorm=dual_mono=true:measured_I=input_i:measured_TP=input_tp:measured_LRA=input_lra:measured_thresh=input_thresh:offset=target_offset:linear=true output_file

+

ffmpeg -i input_file -af loudnorm=dual_mono=true:measured_I=input_i:measured_TP=input_tp:measured_LRA=input_lra:measured_thresh=input_thresh:offset=target_offset:linear=true -ar 48k output_file

This command allows using the levels calculated using a first pass of the loudnorm filter to more accurately normalize loudness. This command uses the loudnorm filter defaults for target loudness. These defaults align well with PBS recommendations, but loudnorm does allow targeting of specific loudness levels. More information can be found at the loudnorm documentation.

Information about PBS loudness standards can be found in the PBS Technical Operating Specifications document. Information about EBU loudness standards can be found in the EBU R 128 recommendation document.

@@ -1204,6 +1205,7 @@
measured_LRA=input_thresh
use the 'input_thresh' value (threshold) from the first pass in place of input_thresh
offset=target_offset
use the 'target_offset' value (offset) from the first pass in place of target_offset
linear=true
tells loudnorm to use linear normalization
+
-ar 48k
Sets the output sample rate to 48 kHz. (The loudnorm filter upsamples to 192 kHz so it is best to manually set a desired output sample rate).
output_file
path, name and extension for output file