[FFmpeg-user] 2 pass CBR or VBR not really fixing the bitrate?
tiglio at icloud.com
Mon Jul 31 20:57:50 EEST 2017
> On Jul 31, 2017, at 1:39 AM, Nicolas George <george at nsup.org> wrote:
> Le duodi 12 thermidor, an CCXXV, Manuel Tiglio a écrit :
>> If you want to stream and build ladders you want to control the peak
>> bitrate, not just the average. That’s the point that I was trying to
> Not exactly. Clients have a limited buffering ability, and what you need
> to control is the average bitrate over the duration of the buffer.
Apple HLS Authoring does not seem to agree with you
1.23. For VOD content the peak bit rate SHOULD be no more than 200% of the average bit rate.
(actually before early this year it used to be 110%).
> And two-pass encoding is not meant for that. Two-pass encoding is meant
> to optimize the bitrate globally, for when you want to fit a movie on
> exactly 2×700 mega-octets so you can burn it on a pair of CD-R.
Two pass encoding is used for CBR and constrained VBR. If you use it for something else, that is great but it is not my question.
> Nicolas George
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