[FFmpeg-user] Joining two videos
Hi all , I have two files one is having both audio video stream(180 secs) and other is having only video(30 secs) . The output required is such that the for initial part there is only the first video on whole screen then after 20 secs the second video should come and the first video overlays on top left corner of it then after completion of the second video first one should again come whole screen till the end. Please tell the filter or any other option with the help of which I can do this in ffmpeg . Thanks ,Shiwani ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
[FFmpeg-user] Changing scale of the video
Hello , I am overlaying two videos and I read in the documentation that on default value of x and y is evaluated for every frame and also the x and y values consists of the overlay_w and overlay_h . So please help me to figure out how to change the value of w , h after 50 frames for next 100 frames ? Thanks ,Shiwani ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Generation of thumbnails
Ok thanks for the suggestion I will go and have a look at the documentation . Thanks ,Shiwani Date: Sun, 24 May 2015 22:33:41 +0200 From: barsn...@gmx.net To: ffmpeg-user@ffmpeg.org Subject: Re: [FFmpeg-user] Generation of thumbnails On Sat, May 23, 2015 at 17:20:11 +, Shiwani Agrawal wrote: Please help me in understanding this command for generating the thumbnails : input.mp4 -ss 1 -filter:v scale=640:-1 -vframes 1 first.jpg -f image2 -vf fps=fps=1/2 -s 128x72 second%03d.jpg I think we'd rather not help you understand that command line, as there is an extreme amount of nonsense in it. It would be better if you look at the docs and create your own command line, that will be much cleaner. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
[FFmpeg-user] Generation of thumbnails
Hello , Please help me in understanding this command for generating the thumbnails : input.mp4 -ss 1 -filter:v scale=640:-1 -vframes 1 first.jpg -f image2 -vf fps=fps=1/2 -s 128x72 second%03d.jpg Thanks and Regards ,Shiwani ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Integration of ffmpeg with Haswell
Hello , Thanks for helping me out in this issue , just want to clarify in the end , does it mean that if we integrate ffmpeg with the media SDK it increases the speed (or Quality) of transcoding process by processor ? If yes , why ? Thanks and Regards Shiwani Date: Mon, 18 May 2015 12:53:12 +0200 From: barsn...@gmx.net To: ffmpeg-user@ffmpeg.org Subject: Re: [FFmpeg-user] Integration of ffmpeg with Haswell On Mon, May 18, 2015 at 12:43:12 +0200, Moritz Barsnick wrote: Actually, my bad. Support is already integrated into ffmpeg. It appears that, at the presence of the Media SDK (libmfx, mfx/mfxvideo.h), the qsv encoders and decoders are built. You will need the Media SDK, and you have to build ffmpeg yourself. I failed to recognize: You need to configure your ffmpeg build with --enable-libmfx Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Integration of ffmpeg with Haswell
Hello , Thanks for explanation , I would certainly test the speed enhancement for my case before paying for the license . Thanks and Regards , Shiwnai Date: Mon, 18 May 2015 17:19:22 +0200 From: barsn...@gmx.net To: ffmpeg-user@ffmpeg.org Subject: Re: [FFmpeg-user] Integration of ffmpeg with Haswell On Mon, May 18, 2015 at 15:07:03 +, Shiwani Agrawal wrote: Thanks for helping me out in this issue , just want to clarify in the end , does it mean that if we integrate ffmpeg with the media SDK it increases the speed (or Quality) of transcoding process by processor ? If yes , why ? The process is called hardware acceleration. See here: https://trac.ffmpeg.org/wiki/HWAccelIntro It helps applications - in this case decoders, encoders, filters, and so on - use special hardware for certain calculations, thereby reducing the load on the CPU and/or increasing the speed. In your case, you are referring to the Intel Quick Sync hardware, which was created particularly for video (and audio?) coding. Using it _should_ increase the speed of the transcoding process (note that speed, quality and compression size are always trade-offs), but doesn't always, it depends on the implementation. On the other hard, the hardware algorithms have certain restrictions and aren't as flexible as software solutions. You won't be able to adjust all parameters of the encoding process, and sometimes more complex profiles or more modern codecs aren't supported either. So it really depends on your use case. And I think you need a really good justification to pay for an extra license for the Intel SDK. (I'm not sure a working free implementation exists yet.) As a normal user, I wouldn't go to the trouble of integrating the SDK. Just check how good ffmpeg's other support is for you first. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
