Add watermark on-fly without transcoding h264

maxlapshin · 19th September 2012, 06:38

Hi. Is it possible to append some macroblocks to each h264 slice so, that watermark will appear on screen?

I.e. something like "absolutely positioned image with alpha channel".

Asmodian · 19th September 2012, 19:32

I am pretty sure this is not possible. So many reasons why not.

The more advanced editors allow you to only re-encode around the edit points (they just re-encode that GOP). I think this is as far down that road as you can go though. It isn't possible to only re-encode a slice, or if you did you would be able to notice the line between slices. You cannot just add "extra" macro blocks, you would need to re-encode something.

edison · 20th September 2012, 16:02

bitmap subtitle ?

maxlapshin · 21st September 2012, 02:13

bitmap subtitle means adding other stream in the same container. For example add metadata to FLV or add subtitles to MPEG-TS. It can be easily removed and I want to "embed logo" in video stream.

natt · 22nd September 2012, 14:36

Quote:

Originally Posted by maxlapshin

bitmap subtitle means adding other stream in the same container. For example add metadata to FLV or add subtitles to MPEG-TS. It can be easily removed and I want to "embed logo" in video stream.

So your criteria is not "easily removed". But if there were a way to add a burned in logo without reencoding existing video and by just adding new blocks, wouldn't it be just as easily removed?

19th September 2012, 06:38	#1 \| Link
maxlapshin erlyvideo Join Date: Sep 2010 Location: Moscow, Russia Posts: 6	Add watermark on-fly without transcoding h264 Hi. Is it possible to append some macroblocks to each h264 slice so, that watermark will appear on screen? I.e. something like "absolutely positioned image with alpha channel".

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19th September 2012, 19:32	#2 \| Link
Asmodian Registered User Join Date: Feb 2002 Location: San Jose, California Posts: 4,378	I am pretty sure this is not possible. So many reasons why not. The more advanced editors allow you to only re-encode around the edit points (they just re-encode that GOP). I think this is as far down that road as you can go though. It isn't possible to only re-encode a slice, or if you did you would be able to notice the line between slices. You cannot just add "extra" macro blocks, you would need to re-encode something.

20th September 2012, 16:02	#3 \| Link
edison Registered User Join Date: Dec 2005 Posts: 106	bitmap subtitle ?

21st September 2012, 02:13	#4 \| Link
maxlapshin erlyvideo Join Date: Sep 2010 Location: Moscow, Russia Posts: 6	bitmap subtitle means adding other stream in the same container. For example add metadata to FLV or add subtitles to MPEG-TS. It can be easily removed and I want to "embed logo" in video stream.