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4

This is possible but will require scripting. ffprobe will be used to determine the duration of the input, then the countdown and background box will be created by the drawtext filter. A 30 second input will start from 30 and count down to 0. Example: input=input.mp4 duration=$(ffprobe -loglevel error -show_entries format=duration -of default=nw=1:nk=1 ...


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Use drawbox for the box, and drawtext for the text. ffmpeg -i input.mp4 -vf \ "format=yuv444p, \ drawbox=y=ih/PHI:color=black@0.4:width=iw:height=48:t=max, \ drawtext=fontfile=OpenSans-Regular.ttf:text='Title of this Video':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th, \ format=yuv420p" \ -c:v libx264 -c:a copy -movflags +faststart output.mp4 ...


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Yes, if you record a video in 4K, then downsize to 1080p, the image will look much clearer than if you shot the video on a 1080p camera. You can also zoom in up to 200% and still retain the quality in a 1080p time line. Why it may look better is because most sensors these days use chroma subsampling. On most consumer 1080p video camera products, the camera ...


3

There are three key factors in your cameras low light performace: 1. Lens (Aperture) The lower your f-stop, the more light gets through to the sensor, you will also have a very shallow (narrow) Depth of Field. Often this is a requirement at night, since cutting off most of your light is generally a bad idea. When looking at any camera, see what lenses are ...


3

Those horizontal lines you're seeing are what you would call Interlacing and it's usually done in an attempt to increase a video's frame rate without using more bandwidth (in other words, make it play smoother and take up less space). You can easily get rid of this by running your video through a program like Handbrake and using their "Decomb" filter. ...


3

You should consider other options than Nikon/Canon. Even if they have proven DSLR can do really good video, thanks to 5D Mark II/III and Magic Lantern, they do not compete well against Panasonic and Sony. If you compare 5D Mark III against a Sony A7S, you're going to have a much better video quality on A7S, thanks to its far superior sensor. Much higher ...


3

Copyright law here says that the person who shoots the footage owns the footage. The only way to change this is if you sign a work for hire contract which says that the production company owns the copyright and that they'll pay you in exchange for your work and copyright. If they didn't pay you then they breached their contract. If there was no contract then ...


2

Motion graphics consists of Graphic Design and Animation. Main focus is to deal with images, typography, color and illustrations, also it's key to work with design assets, like flow charts, icons, images or backdrops, which created with animation in mind. However Compositing consists of Animation, Mathematics and Rating Pictures (eyeballing). Main focus is ...


2

Refresh rate is the frequency at which an image in a moving picture system is redrawn on screen. In modern video systems, for instance, the screen is redrawn 59.97 times per second. The refresh rate is 59.97. Motion picture projections flash a new image at 48 times per second. Film projectors flash each frame of film twice, which is how you get from 24 ...


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Copy the picture into a second video track. Then, zoom in the picture on the lower track (i.e. increase it's size in the effect settings panel). Then, apply a gaussian blur from the effects panel and raise the blur factor in the effect settings panel until you are satisfied with the result. If you need more detailed instructions, please provide some ...


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Using the latest ffmpeg General users should always use ffmpeg from the current git master branch (the latest code available): When encountering an issue the first thing to do is check to see if you are using a build from git master. It is considered stable. It will have more bug fixes and features. FFmpeg development is very active. If you want to get ...


2

From a software point of view, 30 are 29.97 are effectively the same frame rate, rounded for simplification. The same is true of 24fps and 23.976 where 23.976 is simply the precise video compatible version of 24fps. In pure software environments the distinction should be ignored by the software and the more precise references are often omitted to avoid ...


2

No, the D750 is not a good alternative for an avid videographer, at least not if you want the advantages Magic Lantern offers. ML isn't available for Nikon. The reason has nothing to do with the technical advantages of either platform, you can get models of camera that are fairly close in that regard. The problem is that Nikon does not have anything ...


2

Hope this explanation is what you're looking for: When you transcode to an encoding such as H.264 (MPEG-4 part 10) you necessarily also resample the video, that's part of H.264 compression technique. Nontheless, I doubt if this is the reason you experience a timing gap since the resampling doesn't necessarily influence the clock rate of the media. So, I ...


2

First you need to extract the frame that you wish to freeze. This is easy: avconv -i test.webm -vf "select='eq(n,1)'" out.jpeg Then you want to put that frame for the appropriate time interval. avconv -i test.webm -loop 1 -i out.jpeg -an \ -filter_complex "[1:v]trim=start=0:end=5[ol];[0:v]setpts=125+PTS[nv];[nv][ol]overlay=eof_action=pass[final]" \ -map ...


1

Composition involves layering of multiple provided elements, such as live action footage, matte paintings, and special effects. Skills include keying, color correction, and integration. Compositing is often seamless and invisible, with the intent of making the shot appear to have been captured entirely in camera. All special effects in movies for instance ...


1

In addition to what @poor said, there are many applications which do both. For example, Apple Motion, Adobe After Effects, or Autodesk Combustion. Each one can do some combination of animating stills, drawing shapes, displaying text, and each also comes with tools for doing compositing (keyers, masks, matte manipulation tools, etc.). In fact, motion ...


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First off, you are correct in your assumption that 23.98 and 24 are indeed different. They are not effectively the same, and they are not "rounded up". Sometimes 24p means 23.98, and sometimes it means 24. They are both separate and it can be quite problematic to treat them the same. But in practicality, you don't need to worry about the quality, especially ...


1

You have specified that you are interested in working on a huge number of videos, if you have a multicore machine and you will use a normal for loop provided by your shell, you will have one of your cores running hot, while others are doing absolutely nothing. This is not ideal. What you should be doing for such a job is using parallel, a tool that allows ...


1

Instead of the Teradek unit, I would try the new Epiphan Pearl, which can stream and record to/from multiple sources.



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