Streaming Learning Center Where Streaming Professionals Learn to Excel
I just finished my Produce Videos with FFmpeg course which I recorded with Camtasia, edited in Adobe Premiere Pro, and output in the Adobe Media Encoder (AME). I outputted from AME at about 10 Mbps to ensure quality, but now I’m left with 3 GB of files to upload. I know the data rate is unnecessarily high, but AME doesn’t …
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March, 2019
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8 March
AV1 Encoding and 4K
A couple of additional data points on AV1 encoding as follow-ups to my Streaming Media article here. First, a colleague asked about 4K encoding times on Twitter. Second, a reader recommended using the row-mt switch for VP9. So, I encoded a ten-second 4K test file on the same single-CPU ZBook as the Streaming Media article. I used the same basic …
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4 March
Good News: AV1 Encoding Times Drop to Near-Reasonable Levels
When I first tested AV1 encoding back in August 2018 encoding times were glacial and seriously detracted from the potential usability of the codec. Table 1 from that story tells the tale. Unless otherwise indicated, all encoding times are on my HP ZBook notebook powered by a single 2.8 GHz Intel Xeon E3-1505M v5 CPU. In addition, LibVPx is the …
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4 March
Installing and Using Netflix VMAF-Master
I frequently use the VMAF quality metric to analyze encoding parameters and compare codecs. In my experience, VMAF scores tend to match my own subjective quality observations and the fact that Netflix uses it gives the metric great credibility. Originally, there was only one VMAF version, but Netflix has added both a 4K model and a phone model, increasing the …
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February, 2019
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26 February
The VMAF Phone Model and Saving on Streaming to Mobile Viewers
I’m writing a blog post on a free Netflix utility called VMAF-Master that you can download here (Windows executable here). Basically, it’s an open-source command line utility for computing VMAF, PSNR, SSIM, and MS SSIM on Linux and Mac computers with some enterprising contributors compiling a Windows version. One very well written help file relates to the models available under …
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25 February
Reduce Video Message File Size by 34% Without Quality Loss
According to the last published statistics, in June 2017, Whatsapp users sent over 1 billion video messages a day. This obviously represents only a fraction of the market and daily traffic has certainly has grown since then. At the same time, 4K cameras have become standard and mobile screen resolutions have increased in size and quality, driving demand for higher …
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25 February
Recommendation from AMC Networks
I recently finished a streaming consulting project with AMC Networks and was pleased to receive the following LinkedIn recommendation from their VP of Video Products. It was great working with Greg and his team with the gorgeous content from AMC. Beyond this work with AMC, I’ve helped media companies and video publishers fine-tune their encoding parameters, modernize their encoding ladders, …
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20 February
Encoding YUV Files with FFmpeg and Converting to Y4M
I just finished a project that involved encoding lots of downloaded YUV test files, which is something I never tried before. The problem is that there’s no resolution or frame rate information in the file header, so you have to detail all this in the command string. My first crack at the problem evolved into this command string, obviously for a …
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