18-05-2012, 12:17 PM
Video Editing
Video_Editing_Seminar.ppt (Size: 2.02 MB / Downloads: 38)
1. Video Basics – File Formats
AVCHD:
This is an HD format for high resolution video. These files are becoming quite common as HD spreads to more consumers. AVCHD is not a sharing format, it’s for video at the beginning of a project. Since HD is still a new format, few edit programs handle HVCHD files yet, although the list grows daily.
.avi
AVI is an early form of video file so it has been around forever and is very common. The fact that it has been around forever means it is highly compatible with most players, even with the rotating insides issues.
AVI is for video in the beginning of a video project. .avi files are usually way too big for a finished video so it is not considered a sharing file. .avi is better used as a format in the beginning stages of video production, not for the final output.
.wmv:
A Microsoft format. .wmv stands for Windows Media Video. .wmv files are tiny because they are highly compressed. This is one of the smallest sharing formats, so it is for the end stages of your video project.
The more you compress a video, the more details and info you take out. This makes your resolution suffers. Compression is always a balance between file size and image quality.
.WMV files are the type of videos you get emailed directly to you. .wmv are about the only type of file small enough to email so that is a huge advantage
.mov files:
.mov as the file extension means the video is a Quicktime Movie file, which is an Apple software product. Quicktime movie files are very common and one of my personal favorites. MOV functions frequently as both a sharing file but is quality enough to use as source video inside of an editing program. In fact, if you download stock footage chances are fairly high that it will be an .mov file.
.flv:
.flv means it is a Flash video format. This is an extremely common and popular format because it is small but still looks good. This is the most common sharing format on the web there is.
.flv is highly compatible with most computers and browsers. If you are watching a video online, it is probably in .flv format.
MPEG2:
MPEG 2 is the type of video file the a home DVD player will read. If you go out and rent a Hollywood Movie from Blockbuster, the DVD will contain an MPEG2 file.
MPEG4:
MPEG 4 is a sharing format that produces tiny files that still look pretty good. Not as good as .MOV, IMHO but they are so much smaller in size the trade off is worth it if you are mostly concerned with size, not high resolution
Why are there so many file formats…?
High quality video files (raw footage files) are huge. The higher the resolution, the bigger the file because it contains more information in order to achieve that high gorgeous resolution. HD video is difficult to edit with the file sizes are so huge.
To play videos on the web or your computer, they have to be compressed, or made smaller. This is done by designing ways to take information out of the video signal. If you take information out, the resulting file is smaller but the loss of information degrades the picture quality. This process is called compression.
Aspect Ratio
Aspect Ratio describes the dimensions of video screens and video picture elements. All popular video formats are rectilinear, and so can be described by a ratio between width and height. The screen aspect ratio of a traditional television screen is 4:3.
High definition televisions use an aspect ratio of 16:9.
3. Bitrate
Bit rate is generally measured as the number of "bits per second" (bps) at which the data in a video is being delivered. A higher bit rate means that the video has more information.
It is quantified using the bit per second (bit/s or bps) unit orMegabits per second (Mbit/s). A higher bit rate allows better video quality. For example VideoCD, with a bit rate of about 1 Mbit/s, is lower quality than DVD, with a bit rate of about 5 Mbit/s. HD (High Definition Digital Video and TV) has a still higher quality, with a bit rate of about 20 Mbit/s.
B. Programs
1. Windows Movie Maker
2. Adobe Premiere Pro
3. Ulead Video Studio
4. Cyberlink Power Director
5. Sony Vegas Movie Studio
6. Pinnacle Studio
7. Final Cut
8. Adobe After Effects
Online Editors
1. www.masher.com
2. www.videotoolbox.com
3. www.moviemakeronline.com
4. www.onetruemedia.com
5. www.animoto.com