I screw around with ffmpeg a lot, here are some recipies which I frequently use.
ffmpeg -i <input>.wav -codec:a libmp3lame -b:a 320k output.mp3
ffmpeg -i <input>.wav -codec:a libmp3lame -q:a 0 output.mp3
| Average kbit/s | Bitrate range kbit/s | ffmpeg option |
|---|---|---|
| 320 | 320 CBR | -b:a 320k |
| 245 | 220-260 | -q:a 0 |
| 225 | 190-250 | -q:a 1 |
| 190 | 170-210 | -q:a 2 |
| 175 | 150-195 | -q:a 3 |
| 165 | 140-185 | -q:a 4 |
| 130 | 120-150 | -q:a 5 |
| 115 | 100-130 | -q:a 6 |
| 100 | 80-120 | -q:a 7 |
| 85 | 70-105 | -q:a 8 |
| 65 | 45-85 | -q:a 9 |
ffmpeg -i <input>.<ext> -c:a flac <output>.flac
ffmpeg -i <input>.<ext> -acodec pcm_s32le output.wav
There are various encoders for the WAV format, you can list them by passing the -formats switch to ffmpeg. More on this below.
ffmpeg -formats | grep PCM
Decress speed by half.
ffmpeg -i input.wav -filter:a "atempo=0.5" -vn output.wav
Increase speed by half.
ffmpeg -i input.wav -filter:a "atempo=1.5" -vn output.wav
Double speed.
ffmpeg -i input.wav -filter:a "atempo=2.0" -vn output.wav
It is a bit easier to do stuff with MKV files using MKVToolNix – Matroska tools for Linux/Unix and Windows, but you can accomplish many things with ffmpeg.
ffmpeg -i <input>.<ext> -c:a flac -c:v ffv1 <output>.mkv
ffmpeg -i <input>.mkv -c copy -an <output>-nosound.mkv
ffmpeg -i <input>.mkv -vf hue=s=0 <output>-grayscale.mkv
Convert an image into a 720p video which is 40m 1.04 seconds.
ffmpeg -loop 1 -i image.png -c:v libx264 -t 00:40:01.04 -pix_fmt yuv420p -vf scale=1280x720 out.mp4
This is good for videos which were shot vertically on a phone 1080w x 1920h.
This is a two-step proces which I use, it could probably be made into one step.
ffmpeg -i vertical.1080x1920.mkv -vf scale=-1:1080 vertical.608x1080.mkv
ffmpeg -i vertical.608x1080.mkv -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" horizontal.1920x1080.mkv
Extract 20 Frames per Second
ffmpeg -i example.mkv -r 20 img.%10d.jpg
Extract 1 Frame per Second
ffmpeg -i example.mkv -r 1 img.%8d.jpg
ffmpeg -framerate 24 -i img%03d.png output.mp4
ffmpeg -i <input>.<ext> -c:v libx264 -preset ultrafast -crf 0 -vf "transpose=1" <output>.mkv
Rotations:
| Num | Rotation |
|---|---|
| 0 | 90 Counter Clockwise and Vertical Flip (default) |
| 1 | 90 Clockwise |
| 2 | 90 Counter Clockwise |
| 3 | 90 Clockwise and Vertical Flip |
ffmpeg -i <input>.mkv -i <subtitle>.srt -map 0 -map 1 -c copy <output>.mkv
Many subtitles for movies may be downloaded from SubScene.
ffprobe gathers information from multimedia streams and prints it in human- and machine-readable fashion.
ffprobe example.mkv
This shows what formats the installed ffmpeg supports for Muxing and Demuxing.
ffmpeg -formats
Output Example (Support, File Extension, File Description)
File formats:
D. = Demuxing supported
.E = Muxing supported
--
D 3dostr 3DO STR
E 3g2 3GP2 (3GPP2 file format)
E 3gp 3GP (3GPP file format)
D 4xm 4X Technologies
E a64 a64 - video for Commodore 64
D aa Audible AA format files
D aac raw ADTS AAC (Advanced Audio Coding)
DE ac3 raw AC-3
D acm Interplay ACM
D act ACT Voice file format
D adf Artworx Data Format
D adp ADP
D ads Sony PS2 ADS
E adts ADTS AAC (Advanced Audio Coding)
DE adx CRI ADX
D aea MD STUDIO audio
...etc...
DE wav WAV / WAVE (Waveform Audio)
D wc3movie Wing Commander III movie
E webm WebM
E webm_chunk WebM Chunk Muxer
DE webm_dash_manifest WebM DASH Manifest
E webp WebP
D webp_pipe piped webp sequence
DE webvtt WebVTT subtitle
D wsaud Westwood Studios audio
D wsd Wideband Single-bit Data (WSD)
D wsvqa Westwood Studios VQA
DE wtv Windows Television (WTV)
DE wv raw WavPack
D wve Psion 3 audio
D xa Maxis XA
D xbin eXtended BINary text (XBIN)
D xmv Microsoft XMV
D xvag Sony PS3 XVAG
D xwma Microsoft xWMA
D yop Psygnosis YOP
DE yuv4mpegpipe YUV4MPEG pipe
DE adx CRI ADX
D aea MD STUDIO audio
This shows the available devices the installed ffmpeg supports for Muxing and Demuxing.
ffmpeg -devices
Output example for OS X MacBrew installation.
Devices:
D. = Demuxing supported
.E = Muxing supported
--
D avfoundation AVFoundation input device
E caca caca (color ASCII art) output device
D lavfi Libavfilter virtual input device
D qtkit QTKit input device
E sdl SDL output device
Output example for Linux Mint installation.
Devices:
D. = Demuxing supported
.E = Muxing supported
--
DE alsa ALSA audio output
D dv1394 DV1394 A/V grab
DE fbdev Linux framebuffer
D lavfi Libavfilter virtual input device
DE oss OSS (Open Sound System) playback
E v4l2 Video4Linux2 output device
D video4linux2,v4l2 Video4Linux2 device grab
D x11grab X11 screen capture, using XCB