[FFmpeg-user] ? About ffmpeg's prores implemention

[Paul B Mahol]

On 9/2/20, Philippe Laterrade <laterradep at vectracom.fr> wrote:
> Hi Paul,
>
> You're right.
> It's just, I didn't find anything relevant to really adjust the output bit
> rate.
> Perhap's I missed something...somewhere.

http://ffmpeg.org/ffmpeg-codecs.html#ProRes

See bits_per_mb option. This is only for prores_ks encoder.

If you use another, the default prores (prores_aw) encoder, in that
case there is no any options to set,
and encoder happily writes files that may be a lot bellow or above
desired bitrate.

>
> Thank's for your help.
> BR
> Pilippe
>
>
>
>
>
>
> -----Message d'origine-----
> De : ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] De la part de Paul
> B Mahol
> Envoyé : mercredi 2 septembre 2020 18:08
> À : FFmpeg user questions
> Objet : Re: [FFmpeg-user] ? About ffmpeg's prores implemention
>
> On 9/2/20, Philippe Laterrade <laterradep at vectracom.fr> wrote:
>> Hi Valentin,
>>
>> I made some tests very recently with several qcsale value, but never
>> reached
>> exactly the bit rate specs announced by Apple. Did anyone has already
>> success to get those specs?
>
> Next time specify what you actually tried.
>
> qscale is not for reaching specific bitrate. It solely purpose is to
> give you best quality under variable bitrate, whatever that means.
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