Loading ...
Sorry, an error occurred while loading the content.
 

Tips on how to improve the quality of your video for web or mobile devices

Expand Messages
  • Amman Filmmakers
    Amman Filmmakers Cooperative (AFC) December 5, 2006 HOW TO IMPROVE THE QUALITY OF YOUR VIDEO FOR WEB OR MOBILE DEVICES With the internet and mobile devices
    Message 1 of 1 , Dec 5, 2006
      Amman Filmmakers Cooperative (AFC)

      December 5, 2006

      HOW TO IMPROVE THE QUALITY OF YOUR VIDEO FOR WEB OR MOBILE DEVICES

      With the internet and mobile devices becoming popular methods for the
      delivery of video content, a few tips can go a a long way to help
      improve the quality of video before it undergoes the necessary video
      compression for upload to the web or mobile devices. This article is
      published at the Adobe Developer Center.

      ----------------------------------------

      Capturing Good Video

      In addition to the physical properties of your video there are a
      variety of factors that affect the efficiency of the encoder and,
      ultimately, the user experience of the video playback. Two factors
      play a significant role in the encoding process: source quality and
      frame motion.

      Source Quality

      You determine the source quality of your video as soon as you press
      the recording button on your camera. The following are some basic
      guidelines for getting great source video quality and maximizing
      quality in your final compressed video.

      Use a tripod to reduce camera movement. If your camera is not steady,
      most of the image moves, causing a high percentage of pixels in the
      video to change from frame to frame. A steady camera reduces the
      number of pixels that change from frame to frame, giving you better
      quality at higher compression rates (lower data rates).

      Use good lighting techniques. A high-end camera resting on a tripod
      can still produce a low-quality image if there is not enough light.
      Low-light or light-gain filters produce video noise on the image. This
      noise is different for each frame of video and makes it difficult for
      the codec to compress the file at a good quality. You may need to use
      or exceed your maximum data rate to compensate for video noise.

      Use the best camera possible. Low-grade cameras specifically
      consumer-based ones that record an analog signal on magnetic tape
      (VHS, Hi-8, and so on)produce much video analog noise. Still digital
      cameras in movie mode also have limited quality and generally produce
      high-noise video clips. Even if the camera is on a tripod, with
      excellent light, it will produce noise.

      Do the best you can with what you have to work with. High-end digital
      cameras, digital Betacam camcorders, and 35mm film cameras produce a
      clean image if the scene is well-lit and they are stabilized by a
      tripod. Such a scenario produces the best compression ratio and lets
      you reduce the data rate while maintaining excellent quality. However,
      you may not have access to professional equipment, a tripod, and
      excellent lighting conditions. Just remember: the higher the quality
      of your video source, and the less noise in that source, the lower the
      data rate required to render a good playback file.

      Whenever possible, always encode a file from its uncompressed form. If
      you convert a precompressed digital video format into the FLV format,
      the previous encoder can introduce video noise. The first compressor
      has already performed its encoding algorithm on the video and has
      already reduced its quality, frame size, and rate. It may have also
      introduced some of its own digital artifacts or noise. This additional
      noise affects the FLV encoding process and may require a higher data
      rate to play back a good-quality file.

      Frame Motion

      Frame motion is another factor to consider in your encoding formula.
      It is the percentage of the pixels that change from one frame to
      another. This change can result from a person or object moving, camera
      effects, or post-production effects, such as the following:

      * People and objects moving can include someone walking past the
      lens, tree leaves blowing in the wind, cars driving by, or an extreme
      close-up of a face.

      * Camera effects such as camera panning, zooming, or hand-holding
      result in almost 100% pixel change from frame to frame.

      * Postproduction effects such as dissolves, fades, wipes, or
      complex video effects result in a high percentage of pixel changes
      from frame to frame.

      The greater the motion within your video clip, the more information
      the encoder has to compress. If your clip is relatively still (such as
      a talking head video), there isn't much pixel change from frame to
      frame. The video compressor uses a method of dropping frames and then
      encoding a series of fully uncompressed frames. These uncompressed
      frames, called keyframes, are used to calculate and "rebuild" the
      missing frames during playback.

      For the complete Flash video guide visit:
      http://www.adobe.com/devnet/flash/articles/video_guide_02.html

      Copyright 2006 Adobe Systems Incorporated. All rights reserved.

      # # #
    Your message has been successfully submitted and would be delivered to recipients shortly.