Question 1

Is GPU transcoding always better than CPU transcoding?

Accepted Answer

Not always. Transcoding with GPUs maximizes Speed, Parallelism, and Channel Density, which are exactly the three critical factors for live streaming requirements. Likewise, Transcoding with CPUs (software) produces slightly higher quality at a particular bitrate when there is not a time constraint associated with encoding a given title, making it attractive for producing libraries of on-demand content. Many setups use both.

Question 2

Do I need every rung on the ABR ladder?

Accepted Answer

Your audience will determine what the best ladder for you will be. If the majority of your viewers are connected by strong connections, then a 1080p/720p/480p ladder may be sufficient. For other viewers, especially those using mobile devices or using connections over a slow network, you want to give your viewers with a 360p option so they never have to see a "frozen" player.

Question 3

Does GPU transcoding reduce buffering on its own?

Accepted Answer

It removes one major cause: encoding that can't keep up in real time. Faster, consistent rendition output means segments are ready when the player needs them. Buffering also depends on your CDN, bitrate ladder, and the viewer's connection, so treat GPU acceleration as one part of the chain.

Question 4

Will GPU transcoding lower my video quality?

Accepted Answer

No — well-configured GPU encoders produce high-quality output. The small per-bit quality edge software encoders can hold is rarely visible to viewers, and for live it's easily outweighed by hitting the real-time deadline and keeping every rendition stable.

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