K6008297 – Prepare assets for use in interactive media products

Importing, Editing and Assembling Video & Audio Clips in Premiere Pro

After opening Premiere Pro and creating a new project, the first step is to import the video file that is being used. I did this by locating the file in the media browser (bottom left panel) and dragging it to the timeline (bottom right panel), which imports the media into the project.Screen Shot 2017-03-28 at 15.00.37As we captured audio separately, the next step is to import the audio track and sync it with the video. Importing the audio is done the same way as when we imported the video clip. To help sync the audio and video, we had the interviewee clap to give us a clear sound with visual reference to work with. Additionally, as the camera also recorded audio we can get a rough idea of where to sync the tracks by comparing the waveforms of the two audio tracks.Screen Shot 2017-03-28 at 15.10.24With the audio and video synced, we can then remove the unneeded audio from the camera and link the new track to the video (this will help keep the audio and video together when cutting the video into shorter clips).Screen Shot 2017-03-28 at 15.14.22To cut the video into smaller clips, first we select the Razor tool by pressing C on the keyboard, then we click on the part of the video where we want to cut the clip.

Screen Shot 2017-04-04 at 15.34.48Screen Shot 2017-04-04 at 15.34.56To then trim a clip, making sure the selection tool is active by pressing V, click and drag from the start/end of a clip to where you want the clip to start/end and release.Screen Shot 2017-04-04 at 15.41.45This will leave a gap in the video so it’s important to move the clips together again after trimming.

Once we have cut the original video into smaller clips, they can be arranged in the desired order on the timeline. At this point we can add any B Roll into the project, this time adding the videos to a separate video track and removing the audio track from them. To make the transitions between clips a bit better looking, video transitions can be added. This is done by selecting the Video Transitions folder from the Effects window, and dragging the required effect to the transition between two clips.Screen Shot 2017-04-04 at 16.06.53Screen Shot 2017-04-04 at 16.06.59Now we have the main video finished we will add a Title Card and some fade in/out transitions to the start and end. To add a Title, select Title > New Title > and select the appropriate format.Screen Shot 2017-04-04 at 16.32.50.pngThen we can create the title, using the tools provided, in this case I’m just using a solid background with text over it.Screen Shot 2017-04-04 at 16.34.45When you have created the Title, you can close the Title creating window. To insert it into the project, select the appropriate time and press “,” (this is the shortcut to insert a clip). Adding a Fade in/out transition to the start/end of the video is done by adding the Dip To Black effect from Video Transitions to the relevant part of the video.Screen Shot 2017-04-04 at 16.48.26.pngIf we need to make any adjustments to the video we can add a video effect, for example Lumetri Color (this allows us to make adjustments to the colour and exposure of a clip), by dragging it from the effects window to the clip. If we then open the Effect Controls window (making sure the desired clip is selected) we can make our adjustments.Screen Shot 2017-04-04 at 16.54.31With the video complete the final step is to export it by going to File > Export > Media.Screen Shot 2017-04-04 at 16.58.16.pngThen select the desired format and settings. I have chosen to use the H.264 format as this is widely supported and offers a good combination of video quality and file size. Premiere Pro has some build in presets for the export settings, in this case I am using the Youtube 1080p preset as I will be uploading the video to Youtube.Screen Shot 2017-04-04 at 16.59.19.pngThen it’s a matter of pressing Export and waiting for it to finish.Screen Shot 2017-04-04 at 16.59.33

 

K/600/8297

2.2

What are typical frame rate settings, how do they affect file size and which would you use for video to be uploaded onto the web?

A typical framerate for videos is 24 or 25 fps, though 30 or 60 fps is starting to become used more. The higher the fps of a video the larger the file size will be as there are more frames captured in the video. For uploading a video to the web 24fps would be adequate to produce a smooth video.

What is bitrate and how does this affect file size and quality?

Bitrate refers to the number of bits processed in a unit of time, typically a second, or how much data is being processed per second. Typically speaking, a higher bitrate results in better quality as more data is processed but also a higher file size.

What are the typical frame dimensions of a typical video and how does this affect file size and streaming rates?

Typical frame dimensions
Ultra HD – 4k / 2160p : 4096 px by 2160 px
Full HD – 1080p : 1920 px by 1080 px
HD Ready – 720p : 1280 px by 720 px

The larger the frame dimensions the larger the file size are there are more pixels being used thus more data. The larger the frame dimensions the higher the streaming rate, that is more data is streamed per second the higher the frame dimension.

2.3

For audio explain what sampling rates are and how these and bitrate affect file size and data transfer rates.

The Sample Rate refers to the number of samples of audio carried out in a second, or how many times a second a snapshot of the audio is captured, typically measure in Hz or kHz, the bit rate is how much data is captured in each of the snapshots. A higher sample rate and bitrate will result in larger file size as there is more date being captured which in turn means that a higher date transfer rate will be necessary. A typical sample rate would be 44.1kHz and common bit rates are 256 or 320 kbps.

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