From 01a7404ece7ea1c46c847586f8b29a003a9d79b8 Mon Sep 17 00:00:00 2001 From: Joanna White <37188631+b00giehead@users.noreply.github.com> Date: Wed, 16 Jan 2019 13:04:02 +0000 Subject: [PATCH] Update index.html --- index.html | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/index.html b/index.html index abb02e5..bc285ef 100644 --- a/index.html +++ b/index.html @@ -713,6 +713,26 @@

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Synchronize video and audio streams

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ffmpeg -i input_file -itsoffset 0.125 -i input_file -map 1:v -map 0:a -c copy output_file

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A command to slip the video channel approximate 2 frames (0.125 for a 25fps timeline) to align video and audio drift, if generated during video tape capture for example.

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ffmpeg
starts the command
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-i input_file
path, name and extension of the input file
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-itsoffset 0.125
uses itsoffset command to set offset to 0.125 of a second. The offset time must be a time duration specification, see FFMPEG Utils Time Duration Syntax.
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-i input_file
repeat path, name and extension of the input file
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-map 1:v -map 0:a
selects the video channel for itsoffset command. To slip the audio channel reverse the selection to -map 0:v -map 1:a.
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-c copy
copies the encode settings of the input_file to the output_file
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output_file_resync
path, name and extension of the output_file
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