Resolution is the number of pixels spread across a display and is usually written in the form of horizontal pixels x vertical pixels, such as x The resolution of your display affects the highest resolution of stream you can watch.
Resolution is sometimes referred to in a shorthand format using just the vertical pixels, such as p instead of x Your monitor can display every pixel of the video. If the stream was broadcast in p, however, your monitor will scale the image into p.
Bitrate is the amount of data encoded for a unit of time, and for streaming is usually referenced in megabits per second Mbps for video, and in kilobits per second kbps for audio. From a streaming perspective, a higher video bitrate means a higher quality video that requires more bandwidth. Well, not every viewer can download at the highest bitrate possible. You must evaluate your network connection to determine whether it is strong enough to support your stream at your desired resolution.
Streaming at p60 requires more bandwidth than streaming at p30 or p Consider where and how your audience will be watching your video and what their bandwidth limitations may be. Are they on computers or mobile phones? Using Ethernet or LTE? More dynamic content requires higher bitrates to have good quality, so you will need a higher bitrate to stream sporting events or video game competitions as opposed to speakers giving presentations at a conference or commencement ceremonies. The encoded frame rate also affects the required bitrate.
When streaming sports you could encode a 60 frames per second fps stream at p60 or p60; for lower motion events like lectures or conferences, encoding and sending 60 fps may not provide a visible benefit, but requires significantly more bandwidth than streaming at the more common 30 fps. If you have two of those three, you can calculate the third. We pretty much always talk about storage space in terms of bytes, though mega bytes , giga bytes , and tera bytes.
But do we divide by 8 or multiply by 8? We have more feet than yards, just as we have more bits than bytes. We are starting with bits in this case, so we should end up with fewer bytes.
That tells me that I need to divide by 8, not multiply by The number of megabytes in one minute should be a lot more than the number of megabytes in one second, right? So we know we need to multiply by 60, not divide by All we do is multiply by the number of minutes we have. We want to go up the scale from megabytes to gigabytes, so we divide by There we go — now we know how much hard drive space our 2 hours of DNxHD footage will take up!
So here are the simplified formulas which you can calculate instantly. You should note that the quality slider is not linear for x It is logarithmic like the Richter or pH scales. This means small movements in the numbers can have large results. You can encode a few chapters of a source to experiment with different quality values if the above recommendations are not suitable. Encoding a 10minute sample in the middle of your source should give you a good idea of what to expect.
RF 0 applies no compression. It is lossless: it compresses the source without throwing away practically any detail. So should you use RF 0 to perfectly preserve the source?
Not at all. See, DVDs use lossy compression to squeeze down the raw video the studios use to make them — sort of like a quality level of RF
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