Preface#
Recently discovered and used FFmpeg and found it to be very powerful, capable of various audio and video operations. Some software also references FFmpeg mainly because it is a free and open-source tool that does not require licensing. Here, I will briefly make some notes on several common FFmpeg commands to help novice readers easily convert the encoding of their videos! Most of the content here is referenced from existing online sources with marked citations.
Let's have some fun together ฅ՞•ﻌ•՞ฅ
Installing FFmpeg#
Windows#
Since FFmpeg only provides source code that needs to be compiled, there are experts who have compiled FFmpeg that can be directly used from the repository.
https://github.com/BtbN/FFmpeg-Builds/releases
Ubuntu#
Overview#
Container Formats#
The common video file formats are actually containers that include video tracks, audio tracks, metadata, subtitles, titles, cover art, etc. Common video container formats include:
- MP4 (MPEG 4)
- MKV (Matroska)
- WebM
- AVI (ASF)
- MOV (QuickTime)
TOP: WebM is a recently popular container used for AV1, VP9, and VP8, and requires specific hardware acceleration for encoding and decoding.
For example, AIN's new products in 2022 all support AV1 encoding and decoding hardware acceleration.
Encoding#
Common types of encoding include licensed encoding, royalty-free encoding, and audio encoding formats.
Licensed Encoding
- H.262
- H.264
- H.265
Royalty-Free Encoding
- VP8
- VP9
- AV1
Audio Encoding Formats
- MP3
- AAC
Video Encoders
libx264
: The most popular open-source H.264 encoderNVENC
: H.264 encoder based on NVIDIA GPUlibx265
: Open-source HEVC encoderlibvpx
: Google's VP8 and VP9 encoderslibaom
: AV1 encoder
Audio Encoders
- libfdk-aac
- aac
View the installed encoders in FFmpeg
ffmpeg -encoders
Usage#
[1] Global parameters
[2] Input file parameters
[3] Input file
[4] Output file parameters
[5] Output file
Parameters#
-c
: Specify the encoder-c copy
: Directly copy without re-encoding, faster-c:v
: Specify the video encoder-c:a
: Specify the audio encoder-i
: Specify the input file-an
: Remove the audio stream-vn
: Remove the video stream-preset
: Video encoding qualityultrafast
,superfast
,veryfast
,faster
,fast
,medium
,slow
,slower
,veryslow
-y
: Overwrite files without confirmation
More: https://zh.m.wikipedia.org/zh-hans/FFmpeg
File Information#
Format Conversion#
-i Input file
-c copy Direct copy without transcoding is faster
Transcoding#
-i Input file
-c Convert encoder
Trimming#
-ss Start time
-t End time
-i Input file
Bitrate#
This section is too professional and requires a deeper understanding! Here, only the simplest encoding methods are demonstrated, excluding compression configurations.
ABR (VBR) Two-Pass Encoding#
CBR Constant Bitrate#
-i Input file
-b Video bitrate
-minrate Allowed minimum bitrate
-maxrate Allowed maximum bitrate
-bufsize Bitrate control buffer
Size#
-i Input file
-fs Control file size
Resolution#
-i Input file
[Maintain aspect ratio -1]
FPS#
-i Input file
-r Frame rate value
Extract Audio#
-i Input file
-f Output format
-vn Exclude video
-aq 0 Compression quality
-acodec Set audio codec
Separate Audio and Video#
Separate Video
Separate acc Format
Directly Extract Audio
Merge Audio and Video#
-i Input file
-c Video encoding method
Compress Audio#
-i Input file
-b Bitrate
-ar Sampling rate
Screenshot#
Screenshot at a specified time
Extract frames from the beginning
-i Input file
-r Frames per second
-q Image quality
-f Output format
Cover#
Video Cover
Audio Cover
Citations:
FFmpeg Video Processing Beginner's Tutorial
Using ffmpeg to Separate Video and Audio Streams
Common FFmpeg Parameters Explanation and Examples
Bitrate Control (1): Understanding Bitrate Control Modes (x264,x264,vpx)
This article is synchronized and updated to xLog by Mix Space The original link is https://www.miaoer.net/posts/blog/ffmpeg