[FFmpeg-user] ~50% performance difference overlaying static image with png series using -vf/-filter_complex

[d-fens]

Zitat von Paul B Mahol <onemda at gmail.com>:

> On 8/23/13, d-fens <d-fens at 00010111.de> wrote:
>> Zitat von Paul B Mahol <onemda at gmail.com>:
>>
>>> On 8/23/13, d-fens <d-fens at 00010111.de> wrote:
>>>> Zitat von Paul B Mahol <onemda at gmail.com>:
>>>>
>>>>> On 8/22/13, d-fens <d-fens at 00010111.de> wrote:
>>>>>> hi,
>>>>>>
>>>>>> i have a background png and a sequence of pngs with transparency which
>>>>>> should overlay the background.
>>>>>>
>>>>>> when i use
>>>>>>
>>>>>> ./ffmpeg -i %04d.png -vf "movie=bg.png [bg]; [in] format=rgb32, split
>>>>>> [T1], fifo, [bg] overlay=0:0, [T2] overlay=0:0 [out]; [T1] fifo [T2]"
>>>>>> out.mp4
>>>>>>
>>>>>> (taken from
>>>>>> http://stackoverflow.com/questions/10438713/overlay-animated-images-with-transparency-over-a-static-background-image-using-f)
>>>>>> i get arround 13fps for fullHD images, but using
>>>>>>
>>>>>> ./ffmpeg -loop 1 -i bg.png -i %04d.png -filter_complex
>>>>>> overlay=shortest=1 out.mp4
>>>>>
>>>>> Try removing loop and shortest.
>>>>
>>>>
>>>> this just outputs one frame, so no success :(
>>>
>>> Than change order of streams - make bg.png 2nd.
>>
>> well that puts the background over the sequence, its fast (15fps
>> processing) though :| but very static ...
>
> I didn't benchmark but I assume -loop takes most of time as it decodes
> same file over and over again.
> So instead adding looping of main input inside overlay it would be
> better to add generic solution:
> repeat filter which would repeat each frame [0-inf] times.
>
  yes, i also think the png gets re-read in a loop, maybe
http://git.videolan.org/?p=ffmpeg.git;a=commit;h=6e643239d9956ce32888d87451706ee7c8757afa speeds it up a bit, but a repeat filter would be great or loop without the overhead. But just to be clear: there is no way to archive this with current -filter_complex  
yet?