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Understanding Video and Audio Codecs. Content for PowerPoint screen recording exercise prepared by Regina Smart Source: Camtasia Studio Learning Center at www.techsmith.com “Understanding Video and Audio Codecs”. Discussion:. What is an AVI? What is a codec? Lossless vs. lossy

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understanding video and audio codecs

Understanding Video and Audio Codecs

Content for PowerPoint screen recording exercise

prepared by Regina Smart

Source: Camtasia Studio Learning Center at www.techsmith.com

“Understanding Video and Audio Codecs”

discussion
Discussion:
  • What is an AVI?
  • What is a codec?
  • Lossless vs. lossy
  • Identifying installed codecs
  • Determining video codec
what is an avi
What is an AVI?
  • Audio Video Interleave (Microsoft)
  • Number of still images called frames combined sequentially in one file
    • Player displays consecutive images
    • Possibly thousands of frames
    • Large file size
  • AVI files compressed using video codecs to reduce file size
what is a codec
What is a codec?
  • Compressor/decompressor
    • Algorithm – specialized computer program
    • Compression algorithm when record and produce video
    • Decompression when view video
  • Affects video
    • Quality
    • File size
  • Must use same codec for compress/decompress
video codec categories
Video Codec Categories
  • Lossless
    • Maintain perfect image quality when compressed
    • TechSmith Screen Capture Codec (TSCC)
  • Lossy
    • Sacrifice image quality for compression
    • Image quality degrades each time reproduced
    • Microsoft Video 1
codecs
Codecs
  • Many different codecs
    • Each has strengths and weaknesses
techsmith screen capture codec tscc
TechSmith Screen Capture Codec (TSCC)
  • Camtasia default codec
  • Optimized for compressing videos of desktop applications that contain
    • Large blocks of the same color without gradient fills
    • No photographic images
    • Low motion such as office-style applications for training and demonstration
  • Produces small file size compared to other codecs
    • Recommend record with TSCC for video and PCM for audio, then can change to another codec or format as required by users
    • Must distribute codec, but it is free
determine video codec
Determine Video Codec
  • In Windows Explorer right-click video file name
    • Properties
    • Summary tab
    • Advanced
      • Codec listed in Video Compression
  • In Camtasia
    • Right-click a thumbnail and select Properties
techsmith camtasia studio learning center
TechSmith – Camtasia Studio Learning Center
  • Understanding Video and Audio Codecs

www.techsmith.com/learn/camtasia/current/general/1104.asp

  • Video Codecs Overview

www.techsmith.com/learn/camtasia/current/general/1104.1.asp

  • TechSmith Screen Capture Codec Overview

www.techsmith.com/learn/camtasia/current/general/1104.2.asp

  • Audio Codecs Overview

www.techsmith.com/learn/camtasia/current/general/1104.3.asp

  • The Best Overall Codec Options to Use When Recording and Producing

www.techsmith.com/learn/camtasia/current/general/1104.4.asp