On Tue, Dec 22, 2015, at 10:07 AM, juan carlos Rebate wrote:
> How could preserve the quality?, the command -qscale 0 fails, this
> command loses quality 99%

As usual, you need to actually show the command you used and the
complete console output. Also, provide any inputs files if they are
required to duplicate the issue.

Please read this:
http://trac.ffmpeg.org/wiki/MailingListEtiquette

It may help you ask better questions here, and therefore actually get
answers instead of requests for more information.
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