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

Anil Jangam anil_jangam at persistent.co.in
Fri May 13 16:35:41 CEST 2011


We have observed a scenario in which the size of the output transcoded file (~500kb) is greater than the size of the original video file (~140kb). Upon checking with media info tool (and with ffmpeg), we found that the video codec is h263 and audio codec used is amr (see below).

Duration: 00:00:13.20, start: 0.000000, bitrate: 86 kb/s
Stream #0.0(und): Video: h263, yuv420p, 176x144 [PAR 12:11 DAR 4:3], 29.97 tbr, 30k tbn, 29.97 tbc
Stream #0.1(und): Audio: libopencore_amrnb, 8000 Hz, mono, s16

Upon checking the properties of the output file, it shows that video codec is 'mpeg4_sp' and audio codec is 'aac_lc'.

I am not sure if 'mpeg4_sp' is a low compression ratio codec as compare to the 'h263'. In that case, conversion of 'h263' coded video into 'mpeg4_sp' codec video will obviously result in the higher size of the transcoded output.

Can you please confirm this?


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