[FFmpeg-devel] [PATCH] overlay filter

Baptiste Coudurier baptiste.coudurier
Fri Nov 19 02:12:59 CET 2010

On 11/18/2010 04:53 PM, Stefano Sabatini wrote:
> On date Thursday 2010-11-18 16:48:02 -0800, Baptiste Coudurier encoded:
>> On 11/18/2010 04:42 PM, Stefano Sabatini wrote:
>>> On date Thursday 2010-11-18 16:19:45 -0800, Baptiste Coudurier encoded:
>>>> Hi Stefano,
>>>> On 11/15/2010 04:08 AM, Stefano Sabatini wrote:
>>>>> On date Friday 2010-11-12 15:12:06 +0100, Stefano Sabatini encoded:
>>>>>> On date Friday 2010-11-12 13:36:46 +0100, Stefano Sabatini encoded:
>>>>>>> On date Friday 2010-07-16 13:29:42 -0700, Baptiste Coudurier encoded:
>>>>>>>> On 07/16/2010 10:02 AM, Stefano Sabatini wrote:
>>>>>>>>> Hi all,
>>>>>>>>> this is a work in progress based on Bobby and Baptiste work.
>>>>>>>>> It's not yet ready for review, I'm sending it here in case someone
>>>>>>>>> wants to have a look at it and/or commenting it.
>>>>>>>> This filter is _highly_ inefficient in this form. Copying the source
>>>>>>>> is useless and can be avoided. Furthermore the timestamps handling
>>>>>>>> is wrong.
>>>>>>>> What you have to do is to handle timestamps correctly in my version.
>>>>>>> Done, also this version works with movie-in-movie (but supporting loop
>>>>>>> in movie seems a simple and useful feature anyway).
>>>>>>> There is still a bug related to direct rendering (and so only visible
>>>>>>> with ffplay), looking into that
>>>>>> [...]
>>>>>> Fixed by adding AV_PERM_PRESERVE flag in the rej_perms.
>>>>> Updated with some docs fixes.
>>>> Thanks for the work.
>>>> Does the filter works to overlay a single picture logo in this form ?
>>>> I believe that's a needed feature and I'll work on this.
>>> Of course it is supported:
>>> "movie=0:png:ffmpeg.png, scale=80:-1 [over]; [in][over] overlay [out]"
>>> that's for showing a nice overlayed logo for the next FFmpeg show at
>>> linuxtag/whatever ;-)
>>> Note that I'm testing against the movie source I posted here, AFAIK
>>> timestamp handling in the soc repo movie source is broken.
>> Great, and how does it handle movie in movie with the overlayed movie being
>> shorter than the main movie ?
> The last extracted movie frame is overlayed again and again. This
> behavior maybe should be configurable (but shouldn't IMO block main
> repo inclusion) but in that case we'll need some way to notify the
> filterchain about the termination of the movie, maybe you can share
> some ideas about that.

Yes, I thought about this problem, and I think we need a way to notify 
EOF along the filter chain. maybe the source filters should propagate 
EOF in some way.

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