[FFmpeg-user] Converted file size is bigger than source

Vishal Nikam vishaln at alohatechnology.com
Fri May 27 13:35:37 CEST 2011

Hello ffmpeg team,

I am transcoding one .wmv file to .mp4 file, it gets successfully transcode into h264/aac encoder.
But, my problem is that Converted file size is twice than Source file size.

Here is my command.

ffmpeg -i CCC2009Sampler.wmv -acodec aac -vcodec libx264 -fpre "libx264-lossless_ultrafast.ffpreset" -crf 18 -strict experimental -y CCC2009Sampler.mp4

Details of source file:

FileFormat :: asf
AvgBitRate :: 2289 kb/s
Duration :: 3020(Sec)
AudioCodec :: wmav2
AudioBitRate:: 128 kb/s
Channel :: Stereo
SamplingRate :: 44100(Hz)
VideoCodec :: wmv3 (Main)
VideoBitRate :: 2200 kb/s
FrameRate :: -1.0(fps)
VideoSize :: 640*480
FileSize :: 864231560(bytes)

Details of target file :: 

FileFormat :: mov
AvgBitRate :: 3420 kb/s
Duration :: 3020
AudioDetails :: aac
VideoCodec :: h264
VideoBitRate :: 3368 kb/s
FrameRate :: 29.97(fps)
VideoSize ::640*480
FileSize :: 1291278946(bytes)

Please consider my issue.
I am waiting for your reply.

Vishal T. Nikam

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