Bug#587904: error message should say what to try next if codec not found

[Reinhard Tartler]

retitle 587904 Please build against lame to enable mp3 encoding support
block 587904 by 90091
stop

On Fri, Jul 02, 2010 at 09:34:04 (EDT), jidanni at jidanni.org wrote:

> Package: ffmpeg
> Version: 4:0.6-2
> Severity: wishlist
>
> $ ffmpeg -i file.flv o.mp3
> ...
> Input #0, flv, from 'file.flv':...
>   Duration: 00:03:50.22, start: 0.000000, bitrate: 269 kb/s
>     Stream #0.0: Video: flv, yuv420p, 320x240, 261 kb/s, 29.92 tbr, 1k tbn, 1k tbc
>     Stream #0.1: Audio: mp3, 22050 Hz, 2 channels, s16, 8 kb/s
> Output #0, mp3, to 'o.mp3':
>     Stream #0.0: Audio: 0x0000, 22050 Hz, 2 channels, s16, 64 kb/s
> Stream mapping:
>   Stream #0.1 -> #0.0
> Encoder (codec id 86017) not found for output stream #0.0
>
> Well then the package is broken, or some message saying what to try next
> should be given.
>
> The reason may be documented in /usr/share/doc/ffmpeg/README.Debian.gz
> but it is very hard to tell.

the correct fix is to fix the debian packages.

> OK, probably the message should be **codec disabled for legal reasons by Debian.
> Try putting debian-multimedia... on top of your /etc/apt/sources.list... and
> do apt-get update, then reinstall their version of this package**"

I cannot recommend that repository.

btw, we are currently working on getting the lame package in main. once
it is there, I'll enable mp3 support

> P.S., does this really turn 8 kb/s into 64 kb/s? Is that a good thing to do?
>
> Well I tried -ab 8k and found out that the Stream #0.1: Audio: mp3, 22050 Hz, 2 channels, s16, 8 kb/s
> must be wrong. ffprobe gives the same wrong answer.

I don't follow. I'd need example files and full output to comment on
that. BTW, best file the bug upstream: http://ffmpeg.org/bugreports.html

> P.S.S., the man page,
>
>        -ac channels
>            Set the number of audio channels (default = 1).
>
> is wrong. As you see above two channels were the output, even without
> this option.

I think this was recently fixed upstream, not sure if it made it for
0.6, but will definitly be fixed in 0.7

-- 
Gruesse/greetings,
Reinhard Tartler, KeyID 945348A4