Here’s the final output graph from my set up. To get the alpha properly, you
need to force overlay to rgb, then format it back to yuv before the buffersink.
+-------------+
| watermarkIn |default--[439x102 1:1 bgra]--overlay:overlay
| (buffer) |
+-------------+
+----------+
| in |default--[640x960 0:1 yuvj420p]--pad:default
| (buffer) |
+----------+
+-------+
in:default--[640x960 0:1 yuvj420p]--default| pad |default--[640x960 0:1
yuvj420p]--auto-inserted scaler 0:default
| (pad) |
+-------+
+-----------+
auto-inserted scaler 0:default--[640x960 0:1 bgra]-----main| overlay
|default--[640x960 0:1 bgra]--auto-inserted scaler 1:default
watermarkIn:default-------------[439x102 1:1 bgra]--overlay| (overlay) |
+-----------+
+----------+
auto-inserted scaler 1:default--[640x960 0:1 yuv420p]--default| format
|default--[640x960 0:1 yuv420p]--out:default
| (format) |
+----------+
+--------------+
format:default--[640x960 0:1 yuv420p]--default| out |
| (buffersink) |
+--------------+
+------------------------+
pad:default--[640x960 0:1 yuvj420p]--default| auto-inserted scaler 0
|default--[640x960 0:1 bgra]--overlay:main
| (scale) |
+------------------------+
+------------------------+
overlay:default--[640x960 0:1 bgra]--default| auto-inserted scaler 1
|default--[640x960 0:1 yuv420p]--format:default
| (scale) |
+------------------------+
- Stephen
On Feb 28, 2014, at 4:41 PM, Stephen H. Gerstacker <[email protected]>
wrote:
> As a follow up, I attempted the following
>
> Create a new “buffer” that I dump BGRA frames in to (that’s the format the
> watermark is in as memory).
> Every time I add a frame to my original buffer, I add a watermark frame to my
> watermark buffer.
> After the pad link, I added an “overlay” filter with the pad and watermark
> buffer as inputs, outputting to the buffersink.
>
> This worked, but I loose the alpha transparency. Anything I can do to
> preserve that?
>
> - Stephen
>
>
>
> On Feb 28, 2014, at 9:54 AM, Stephen H. Gerstacker <[email protected]>
> wrote:
>
>> I'm making an AVFilterGraph in code. I need to apply a watermark to the
>> video.
>>
>> My assumption is that I need to use the "movie" AVFilter to then overlay it.
>> My watermark is just stored in memory, not in a file, so I'm unsure how to
>> point the "movie" filter to use that watermark?
>>
>> Can someone clarify how I would do that?
>>
>> My current filter graph is basically:
>>
>> buffer -> (optional rotation) -> scale -> pad -> buffersink
>>
>> The watermark would come in after the pad and overlaid there.
>>
>> - Stephen
>>
>>
>>
>> _______________________________________________
>> Libav-user mailing list
>> [email protected]
>> http://ffmpeg.org/mailman/listinfo/libav-user
>
> _______________________________________________
> Libav-user mailing list
> [email protected]
> http://ffmpeg.org/mailman/listinfo/libav-user
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