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

Reindl Harald h.reindl at thelounge.net
Fri May 13 23:37:38 CEST 2011

Am 13.05.2011 22:11, schrieb Anil Jangam:

>> What about define a -vb?
> [[Anil Jangam]] You mean video bit rate right? The option is -b actually. Option -vb does not exist.
> I will try this and test. Thanks.

consider a newer ffmpeg-version

-vb exists since a very long time

Video options:
-b bitrate          set bitrate (in bits/s)
-vb bitrate         set bitrate (in bits/s)
-vframes number     set the number of video frames to record
-r rate             set frame rate (Hz value, fraction or abbreviation)
-s size             set frame size (WxH or abbreviation)
-aspect aspect      set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
-vn                 disable video
-vcodec codec       force video codec ('copy' to copy stream)
-sameq              use same video quality as source (implies VBR)
-pass n             select the pass number (1 or 2)
-passlogfile prefix  select two pass log file name prefix
-newvideo           add a new video stream to the current output stream
-vlang code         set the ISO 639 language code (3 letters) of the current video stream

>> you input file has 86 kb/s
> [[Anil Jangam]] Is this 86kb/s bit rate shown by ffmpeg is video bit rate or audio bit rate? Sorry if it too obvious question. 

Not 100% sure about the output but since it is the first line with duration i guess both combined
But anyways, even if it is vbr only your audio-bitrate is higher alone
Newer versions have better output

  Duration: 01:58:39.04, start: 0.000000, bitrate: 1937 kb/s
    Stream #0.0: Video: msmpeg4, yuv420p, 720x576, 25 tbr, 25 tbn, 25 tbc
    Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s

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