This page provides information on video format conversion.
Some mobile phones capture video in the file format .3gp.
The .3gp file format can be converted to .mpg format (or others) via ffmpeg.
The following command is useful.
C:\>ffmpeg -y -i input.3gp -sameq -r 24 -s cif output.mpg
Videos can be rotated by the following command,
C:\ffmpeg -i input
-sameq -r 24 -vf transpose=2 output
C:\>ffmpeg -i output.mpg -sameq -vf "setpts=0.2*PTS" output_fast.mpg
mpg files can be concatenated (joined) in windows via the command line as follows. Note the '/b' indicates that the files are binary files.
C:\>copy file1.mpg /b + file2.mpg /b output.mpg
Note:
-y = Overwrite output files without asking.
-i = input file name
-sameq = same quality
-r = frame rate
-s = Set frame size. The format is ‘w x h’ (default - same as source). The following abbreviations are recognized:
‘sqcif’ 128x96
‘qcif’ 176x144
‘cif’ 352x288
‘4cif’ 704x576
‘16cif’ 1408x1152
‘qqvga’ 160x120
‘qvga’ 320x240
‘vga’ 640x480
‘svga’ 800x600
‘xga’ 1024x768
‘uxga’ 1600x1200
‘qxga’ 2048x1536
‘sxga’ 1280x1024
‘qsxga’ 2560x2048
‘hsxga’ 5120x4096
‘wvga’ 852x480
‘wxga’ 1366x768
‘wsxga’ 1600x1024
‘wuxga’ 1920x1200
‘woxga’ 2560x1600
‘wqsxga’ 3200x2048
‘wquxga’ 3840x2400
‘whsxga’ 6400x4096
‘whuxga’ 7680x4800
‘cga’ 320x200
‘ega’ 640x350
‘hd480’ 852x480
‘hd720’ 1280x720
‘hd1080’ 1920x1080
http://en.wikipedia.org/wiki/3GP_and_3G2
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