[FFmpeg-trac] #2251(undetermined:closed): avconv ignores "-q" argument

[FFmpeg]

#2251: avconv ignores "-q" argument
-------------------------------------+-------------------------------------
             Reporter:  illumilore   |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:  invalid
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
Changes (by llogan):

 * status:  new => closed
 * resolution:   => invalid
 * component:  FFmpeg => undetermined


Old description:

> When converting to webm with a "-q 9" argument, avconv instead uses the
> lowest quality conversion. As it is encoding, it says "q=0.0" and the
> resulting file is small in size and has bad quality.
>
> "avconv -i vid.mkv -q 9 vid.webm"
>
> avconv version 0.8.5-6:0.8.5-0ubuntu0.12.10.1, Copyright (c) 2000-2012
> the Libav developers
>   built on Jan 24 2013 14:49:20 with gcc 4.7.2
> avconv 0.8.5-6:0.8.5-0ubuntu0.12.10.1
> libavutil    51. 22. 1 / 51. 22. 1
> libavcodec   53. 35. 0 / 53. 35. 0
> libavformat  53. 21. 1 / 53. 21. 1
> libavdevice  53.  2. 0 / 53.  2. 0
> libavfilter   2. 15. 0 /  2. 15. 0
> libswscale    2.  1. 0 /  2.  1. 0
> libpostproc  52.  0. 0 / 52.  0. 0
>
> Summary of the bug:
> How to reproduce:
> {{{
> % ffmpeg -i input ... output
> ffmpeg version
> built on ...
> }}}
> Patches should be submitted to the ffmpeg-devel mailing list and not this
> bug tracker.

New description:

 When converting to webm with a "-q 9" argument, avconv instead uses the
 lowest quality conversion. As it is encoding, it says "q=0.0" and the
 resulting file is small in size and has bad quality.


 {{{
 avconv -i vid.mkv -q 9 vid.webm

 avconv version 0.8.5-6:0.8.5-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the
 Libav developers
   built on Jan 24 2013 14:49:20 with gcc 4.7.2
 avconv 0.8.5-6:0.8.5-0ubuntu0.12.10.1
 libavutil    51. 22. 1 / 51. 22. 1
 libavcodec   53. 35. 0 / 53. 35. 0
 libavformat  53. 21. 1 / 53. 21. 1
 libavdevice  53.  2. 0 / 53.  2. 0
 libavfilter   2. 15. 0 /  2. 15. 0
 libswscale    2.  1. 0 /  2.  1. 0
 libpostproc  52.  0. 0 / 52.  0. 0
 }}}

--

Comment:

 You are at the wrong bug tracker. avconv is not from FFmpeg. See
 http://stackoverflow.com/a/9477756/1109017

 If you believe there is a bug in ffmpeg from FFmpeg (using git head) then
 please re-open this bug report.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2251#comment:1>
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