FFmpeg - Revision history

E.vandenberge: /* Trimming video */

2026-04-21T09:59:25Z

Trimming video

2026-04-21T09:55:30Z

2026-04-21T09:55:09Z

Installation

2026-04-21T09:43:01Z

2026-03-17T13:16:09Z

2026-03-17T13:05:16Z

Usage

2025-12-09T09:51:03Z

2025-04-29T11:26:19Z

Usage

2025-03-12T13:17:52Z

2025-01-20T12:34:58Z

Add audio to video

@@ Line 94: / Line 94: @@
 <code>-b:v 8M</code> specifies video bit rate, in this case 8Mbit/s, which determines video quality.
-Note: you can use <code>-c copy</code> to trim without re-encoding, but in this case FFmpeg can only cut to the nearest keyframe, so the output may not be exactly the same length as specified.
+⚠️If you use <code>-vcodec copy</code> to trim without re-encoding, FFmpeg can only cut to the nearest keyframe, so the output may not be exactly the same length as specified.
 ===Batching===

@@ Line 22: / Line 22: @@
 ==Installation==
 ===Windows 10/11===
-#Download the latest ffmpeg-release-full build on https://ffmpeg.org/download.html
+#Go to https://ffmpeg.org/download.html
-#Unpack the 7z/zip file anywhere you like
+#Under "Get packages & executable files", select the Windows logo and follow one of the links below (''gyan.dev'' is most common)
 #Add ffmpeg to Windows' Environment Variables:
 ## Open the start menu and start typing "Environment Variables"

@@ Line 16: / Line 16: @@
 FFmpeg is an open-source command-line tool to convert audio and video files. <br/>
-We know command-line tools can seem scary! But conversion software GUIs are often a more limiting, or will obfuscate what gets done to your video or audio file. For the highest level of control and transparency, we therefore highly recommend using FFmpeg for all your AV conversion needs.
+We know command-line tools can seem scary! But conversion software GUIs (graphical user interfaces) are often a more limiting, or will obfuscate what gets done to your video or audio file. For the highest level of control and transparency, we therefore highly recommend using FFmpeg for all your AV conversion needs.
 <!-- Table of Contents will be generated here -->

@@ Line 15: / Line 15: @@
 }}
-FFmpeg is an open-source command-line tool to convert audio and video files. We know command-line tools can seem scary! But there really is no better solution for processing videos for the highly specific needs of research.
+FFmpeg is an open-source command-line tool to convert audio and video files. <br/>
 <!-- Table of Contents will be generated here -->

@@ Line 35: / Line 35: @@
 FFmpeg needs to be run from the command line, but you can create batch scripts to automate the process for multiple files. There is also a plugin for Python (https://pypi.org/project/ffmpeg-python/), but it is fairly limited so we recommend using subprocess instead (see example below).
-The following are examples of conversions that we commonly use. For [[Psychopy]] applications, please follow the more strict instructions under [[Video Playback#FFmpeg]]
+The following are examples of conversions that we commonly use. For [[Psychopy]] applications, please follow the more strict instructions under [[Video Playback#FFmpeg]].
 ===Basic Format Conversion===
@@ Line 121: / Line 121: @@
 </syntaxhighlight >
 The command within <code>subprocess.run()</code> is the same as you would type into the command line. You can use Python's [https://docs.python.org/3/tutorial/inputoutput.html#tut-f-strings string formatting] to insert variables.
 ==See Also==
 * [[Video Codecs]]

@@ Line 72: / Line 72: @@
 {{cmdline|ffmpeg -i inputvideo.mp4 -i inputaudio.wav -vcodec copy -map 0:v -map 1:a output.mp4}}
-<code>-i</code> is used twice here to add a seceond input file.
+<code>-i</code> is used twice here to add a second input file.
 <code>-map 0:v</code> tells FFmpeg to take video from the first input (count starts at 0)