[FFmpeg-user] differences between -vf and -filter_complex

[Paul B Mahol]

On 5/10/17, Dave Rice <dave at dericed.com> wrote:
>
>> On May 10, 2017, at 2:13 PM, Paul B Mahol <onemda at gmail.com> wrote:
>>
>> On 5/10/17, Dave Rice <dave at dericed.com <mailto:dave at dericed.com>> wrote:
>>> Hi ffmpeg-user,
>>>
>>> In some cases I've been using -vf and -filter_complex interchangeability
>>> but
>>> notice that some behavior is unexpectedly different.
>>>
>>> For instance if I use format=yuv422p10le within -vf and within
>>> -filter_complex the output is different. Is there something else I should
>>> add to the filterchain to get consistent results.
>>>
>>> Below is the output of:
>>> ffmpeg -f lavfi -i testsrc2=r=1:d=5             -vf format=yuv422p10le -f
>>> framemd5 -
>>> and
>>> ffmpeg -f lavfi -i testsrc2=r=1:d=5 -filter_complex format=yuv422p10le -f
>>> framemd5 -
>>
>> Both commands are suboptimal, use:
>>
>> ffmpeg -f lavfi -i testsrc2=r=1:d=5,format=yuv422p10le -f framemd5 -
>
> I usually avoid lavfi formatted inputs when I can, because IIUC there's no
> method to preserve frame interlacement data from the input through the
> filterchain. See https://trac.ffmpeg.org/ticket/4057.

How is that even related? format simply tells in what format testsrc2
will render its output.

By your command it is doing slow scale work internally always.