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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:. What is an AVI? What is a codec? Lossless vs. lossy

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Understanding Video and Audio Codecs

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  1. 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”

  2. Discussion: • What is an AVI? • What is a codec? • Lossless vs. lossy • Identifying installed codecs • Determining video codec

  3. 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

  4. 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

  5. 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

  6. Codecs • Many different codecs • Each has strengths and weaknesses

  7. 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

  8. Identify Installed Codecs

  9. 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

  10. 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

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