How to use FFMPEG on LInux (Converting Audio/Video)

This articles in divided in various sections

• Parameter Used
• Command Line Syntax
• Conversion Examples

Parameter Used:
Common Parameters

-i ‘filename’	Filename will be the Path of Source Filename
-y	Overwrite the existing output file without prompting
-an	disable audio

Video Related Parameters

-aspect ‘aspect ratio’	Set Aspect Ratio for the video (4:3, 16:9 or 1.3333, 1.7777)
-r ‘rate’	set frame rate in Hz for the video
-s ’size’	set video resolution size (Width x Height)
-sameq	use same video quality as source

Audio Related Parameters

-ar ‘rate’	set audio sampling rate (in Hz)
-acodec ‘codec’	force audio codec E.g. mp3
-vol ‘volume’	change audio volume (256=normal)
-ab ‘rate’	set audio bit rate (in bits/s)

Advanced Parameters

-map_meta_data output file:input file

Copy the Metadata from Input File to Converted output file

Command Line Syntax
ffmpeg –i ‘input filename’ ‘output filename’

• Syntax Example:
  [root@linux /]# ffmpeg -i demo.mpg demo.flv
  Here FFMPEG will convert demo.mpg file to demo.flv

Conversion Examples:

Video Examples:

• Converting MOV to FLV using FFMPEG
  ffmpeg -i movie1.mov movie1.flv
  This will convert movie1.mov file to movie1.flv

• Converting Mpeg to FLV using FFMPEG
  ffmpeg -i movie1.mpeg movie1.flv
  This will convert movie1.mpeg file to movie1.flv

• Converting AVI to FLV using FFMPEG
  ffmpeg -i movie1.avi -s 500×500 movie1.flv
  This will convert movie1.avi file to movie1.flv and will resize the video resolution to 500×500

• Converting 3GP to FLV using FFMPEG
  ffmpeg -i movie1.3gp -sameq -an movie1.flv
  This will convert movie1.3gp file to movie1.flv and will keep the original file settings and will disable the audio content
• Converting MPEG to 3GP using FFMPEG
  ffmpeg -i movie1.mpeg -ab 8.85k -acodec libamr_wb -ac 1 -ar 16000 -vcodec h263 -s qcif movie2.3gp

Audio Examples:

• Converting aac to mp3 using FFMPEG with MetaData
  ffmpeg -i audio1.aac -ar 22050 -ab 32 -map_meta_data audio1.mp3:audio1.aac audio1.mp3
  This will convert audio1.aac to audio1.mp3 having audio rate 22.05 Khz and Audio BitRate 32Khz and will copy the meta data from .aac file to .mp3 file

• Converting WMV to MP3 using FFMPEG
  ffmpeg -i audio1.wmv audio1.mp3
  This will convert audio1.wmv file to audio1.mp3

• Converting WMV to FLV using FFMPEG
  ffmpeg -i audio1.wmv audio1.flv
  This will convert audio1.wmv file to audio1.flv, this will generate only audio content

• Converting AMR to MP3 using FFMPEG
  ffmpeg -i audio1.amr -ar 22050 audio1.mp3
  This will convert audio1.amr file to audio1.mp3 having audio rate 22.05 Khz

• Converting aac to mp3 using FFMPEG
  ffmpeg -i audio1.aac -ar 22050 -ab 32 audio1.mp3
  This will convert audio1.aac to audio1.mp3 having audio rate 22.05 Khz and Audio BitRate 32Khz

source http://www.hiteshagrawal.com/ffmpeg/converting-audiovideos-using-ffmpeg