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

[Anil Jangam]

Team,

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?

/anil.



DISCLAIMER
==========
This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.