36 lines
931 B
Markdown
36 lines
931 B
Markdown
---
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title: Ffmpeg
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layout: default
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---
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### Common switches
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-codecs # list codecs
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-c:v # video codec (-vcodec) - 'copy' to copy stream
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-c:a # audio codec (-acodec)
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-fs SIZE # limit file size (bytes)
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-b:v 1M # video bitrate (1M = 1Mbit/s)
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-b:a 1M # audio bitrate
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-aspect RATIO # aspect ratio (4:3, 16:9, or 1.25)
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-r RATE # frame rate per sec
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-s WIDTHxHEIGHT # frame size
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-vn # no video
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-aq QUALITY # audio quality (codec-specific)
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-ar 44100 # audio sample rate (hz)
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-ac 1 # audio channels (1=mono, 2=stereo)
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-an # no audio
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-vol N # volume (256=normal)
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### Ringtone conversion using ffmpeg
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ffmpeg -i foo.mp3 -ac 1 -ab 128000 -f mp4 -acodec libfaac -y target.m4r
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### To webm
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ffmpeg -i input.mp4 -vcodec libvpx -acoder libvorbis output.webm
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