[FFmpeg-user] h264_vaapi missing frames

[Carl Eugen Hoyos]

2018-03-23 14:12 GMT+01:00, Mark Thompson <sw at jkqxz.net>:
> On 23/03/18 01:28, Kai Hendry wrote:
>> Thank you Moritz! Damn, I feel like a fool. ;)
>>
>> Unfortunately Mark's suggestion doesn't seem to have an impact.
>>
>> As you hopefully can see here:
>> https://s.natalian.org/2018-03-23/1521768226.mp4
>>
>> The mouse still doesn't move smoothy across the screen. Hence I feel
>> it's dropping frames!
>>
>> https://s.natalian.org/2018-03-23/1521768226.mp4.log
>> ...
>> *** 38 dup!
>> ...
>> *** 33 dup!
>> ...
>> *** 40 dup!
>> ...
>> *** 39 dup!
>> ...
>> *** 40 dup!
>> ...
>> *** 38 dup!
>> ...
>> *** 40 dup!
>> ...
>> *** 39 dup!
>> ...
>> *** 39 dup!
>> ...
>> *** 39 dup!
>> frame=  439 fps= 30 q=-0.0 Lsize=    1870kB time=00:00:14.58
>> bitrate=1050.4kbits/s dup=381 drop=34 speed=0.985x
>
> This is still duplicating a very large number of frames for video sync.  As
> suggested previously, please try with video sync disabled ("-vsync 0") or
> without audio.

To the best of my knowledge, this would produce an invalid output file:
The input is not cfr, FFmpeg's mov output does not support vfr.

Carl Eugen

>
> - Mark
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