Here's a column that talks about the requirement to perform both objective and subjective testing when evaluating different encoding techniques or comparing codecs. Here's the first paragraph. I spend a lot of time assessing video quality, sometimes

Using Objective and Subjective Quality Tests

Jan Ozer July 15, 2015 Blogs Leave a comment 764 Views

Here’s a column that talks about the requirement to perform both objective and subjective testing when evaluating different encoding techniques or comparing codecs. Here’s the first paragraph.

I spend a lot of time assessing video quality, sometimes to compare different codecs, but more frequently to identify the optimal encoding techniques. For example, does an I-frame interval of 3 seconds deliver substantially better quality than an interval of 1 second? How about VBR vs. CBR, or the very slow x265 preset compared to medium? The only way to know is to encode both ways and compare the results.

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About Jan Ozer

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I help companies train new technical hires in streaming media-related positions; I also help companies optimize their codec selections and encoding stacks and evaluate new encoders and codecs. I am a contributing editor to Streaming Media Magazine, writing about codecs and encoding tools. I have written multiple authoritative books on video encoding, including Video Encoding by the Numbers: Eliminate the Guesswork from your Streaming Video (https://amzn.to/3kV6R1j) and Learn to Produce Video with FFmpeg: In Thirty Minutes or Less (https://amzn.to/3ZJih7e). I have multiple courses relating to streaming media production, all available at https://bit.ly/slc_courses. I currently work as www.netint.com as a Senior Director in Marketing.

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