From 558811456642498bcc89443228d6d7a723117c05 Mon Sep 17 00:00:00 2001 From: Andrew Weaver Date: Mon, 31 Oct 2016 15:33:13 -0400 Subject: [PATCH] formatting with underscores --- index.html | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/index.html b/index.html index 9a52ec7..64f6560 100644 --- a/index.html +++ b/index.html @@ -668,22 +668,22 @@

Generate two access MP3s from input. One with appended audio (such as copyright notice) and one unmodified.

-

ffmpeg -i input_file.wav -i input_file_to_append -filter_complex "[0:a:0]asplit=2[a][b];[b]afifo[bb];[1:a:0][bb]concat=n=2:v=0:a=1[concatout]" -map "[a]" -codec:a libmp3lame -dither_method modified_e_weighted -qscale:a 2 output_file.mp3 -map "[concatout]" -codec:a libmp3lame -dither_method modified_e_weighted -qscale:a 2 output_file_appended.mp3

+

ffmpeg -i input_file -i input_file_to_append -filter_complex "[0:a:0]asplit=2[a][b];[b]afifo[bb];[1:a:0][bb]concat=n=2:v=0:a=1[concatout]" -map "[a]" -codec:a libmp3lame -dither_method modified_e_weighted -qscale:a 2 output_file.mp3 -map "[concatout]" -codec:a libmp3lame -dither_method modified_e_weighted -qscale:a 2 output_file_appended.mp3

This script allows you to generate two derivative audio files from a master while appending audio from a seperate file (for example a copyright or institutional notice) to one of them.

ffmpeg
starts the command
-
-i input file
path, name and extension of the input file (The master file)
-
-i input file to append
path, name and extension of the input file (The file to be appended to access file)
+
-i input_file
path, name and extension of the input file (The master file)
+
-i input_file_to_append
path, name and extension of the input file (The file to be appended to access file)
-filter_complex
enables the complex filtering to manage splitting the input to two audio streams
[0:a:0]asplit=2[a][b];
asplit allows audio streams to be split up for seperate manipulation. This command splits the audio from the first input (the master file) into two streams "a" and "b"
[b]afifo[bb];
this buffers the stream "b" to help prevent dropped samples and renames stream to "bb"
[1:a:0][bb]concat=n=2:v=0:a=1[concatout]
concat is used to join files. n=2 tells the filter there are two inputs. v=0:a=1 Tells the filter there are 0 video inputs and 2 audio inputs. This command appends the audio from the second input to the beginning of stream "bb" and names the output "concatout"
-map "[a]"
this maps the unmodified audio stream to the first output
-codec:a libmp3lame -dither_method modified_e_weighted -qscale:a 2
sets up mp3 options (using constant quality)
-
output file
path, name and extension of the output file (unmodified)
+
output_file
path, name and extension of the output file (unmodified)
-map "[concatout]"
this maps the modified stream to the second output
-codec:a libmp3lame -dither_method modified_e_weighted -qscale:a 2
sets up mp3 options (using constant quality)
-
output file appended
path, name and extension of the output file (with appended notice)
+
output_file_appended
path, name and extension of the output file (with appended notice)