[FFmpeg-user] 2 pass encoding with hevc_nvenc

[Reindl Harald]

Am 04.09.2016 um 14:32 schrieb Carl Eugen Hoyos:
> 2016-09-04 14:00 GMT+02:00 Reindl Harald <h.reindl at thelounge.net>:
>>
>> Am 04.09.2016 um 13:57 schrieb Peter White:
>>> But the encoding time doubles--not worth it
>>
>> with smart params it don't double
>>
>> the first pass can be with a faster profile
>
>> and skip audio entirely
>
> This can have bad effects with FFmpeg and x264:
> If you are lucky, you get a crash, in the worst case,
> encoding succeeds but you get worse quality than
> one-pass (wrong frames get the low quantizers)

given that we use it for a long time now as default in our 
ffmpeg-wrapper, files are typically smaller than with single-pass and 
the quality is as expected the point is "can"

long time means over years for all sort of videos

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