The frame rate is how many pictures your stream shows each second, and the right choice depends on where you are and what you show.

Countries with a fifty hertz power grid traditionally use twenty-five or fifty frames per second, while sixty hertz countries use thirty or sixty.

Matching the grid matters under artificial light, because a frame rate that disagrees with the mains frequency can make lights flicker on camera.

For talking heads, lectures and worship, the lower rate of your region looks natural and needs less bitrate.

For sport, games and fast movement, the higher rate gives smoother motion and is worth the extra bitrate if your upload allows it.

Keep every camera, the switcher and the encoder at the same frame rate, because each conversion between rates adds judder or dropped frames.

Converting between the two families, such as from a fifty based camera to a sixty based stream, is the hardest case and shows uneven motion.

Interlaced video sends each frame as two half pictures of alternating lines, which is how 1080i television formats work.

On a computer or phone screen, which shows whole frames, interlaced video that is not converted displays thin comb lines on every moving edge.

The best fix is to set your camera to progressive output, marked with a p after the line count, whenever the camera offers it.

If a source can only send interlaced video, enable deinterlacing for that source in your software, which in OBS is in the right click menu of the source.

Choose a deinterlacing method that suits your content, since simple methods lose detail and better ones need more processing power.

Some cameras label progressive output carried inside an interlaced signal as PsF, and many capture devices handle it as progressive.

Cinema style twenty-four frames per second looks deliberate in a film but often stutters in live shows with movement.

Fractional rates such as twenty-nine point nine seven exist for historical television reasons, and most equipment treats them as thirty without trouble as long as you stay consistent.

Before the show, record a short test with fast movement and play it back on a phone, where combing and judder are easy to spot.

Write the chosen frame rate into your checklist, so a camera that reset to its default after a firmware update does not surprise you on air.

Screen captures and game footage have their own rate, so set your capture source to the same value as your output to keep motion smooth.

If you are unsure, use the lower rate of your region for speech and the higher one for motion, and keep that choice for the whole series.