Bitrate Explained: CBR vs. VBR on Security Cameras

Bitrate is how much data per second a camera sends to the recorder, usually measured in megabits per second (Mbps). It decides how much detail survives compression, how much storage you need and how much load you put on the network. Two cameras with the same resolution can look very different if one runs at 2 Mbps and the other at 8 Mbps. Most systems offer two modes, constant bitrate (CBR) and variable bitrate (VBR), and the choice affects both quality and storage. This guide explains bitrate in plain language, how CBR and VBR differ, how codecs fit in, how to calculate storage and what settings to start with in New York and New Jersey homes and businesses.

This is general information, not legal advice. Talk to a qualified installer about your specific building and requirements.

1. The Short Version

Item	CBR	VBR
Bitrate	Stays near a set value	Rises and falls with the scene
Storage	Predictable	Varies
Quality	Can suffer in busy scenes	Better in busy scenes
Best for	Fixed storage budgets	Mixed activity

2. What Bitrate Is

Compression discards information the eye is less likely to notice, so the raw stream becomes manageable. Bitrate sets how much data you allow. A low bitrate forces more compression, which can blur detail, especially during motion. A high bitrate preserves more detail but uses more disk and bandwidth. There is no single right number; it depends on resolution, frame rate, codec and scene.

3. Constant Bitrate (CBR)

With CBR, the camera tries to hold the bitrate near a fixed target. Storage use is predictable, which makes planning easy. The downside is that busy scenes, such as a crowded lobby or a passing car, may not get enough bits and look blocky, while quiet scenes waste bits. CBR suits situations where you have a hard storage limit or limited bandwidth.

4. Variable Bitrate (VBR)

With VBR, the bitrate rises when the scene is complex and falls when it is calm. Quality stays more consistent where it matters, and quiet scenes use little storage. The downside is unpredictability: a busy week can use more storage than a quiet one. Most VBR settings include a maximum bitrate to cap the worst case. Set the cap with care.

5. H.264, H.265 and Smart Codecs

H.265 (HEVC) compresses more efficiently than H.264, often cutting bitrate by a third or more at similar quality. Smart codecs reduce bitrate further in static scenes. Check that your recorder, viewing apps and browsers support the codec. Efficient compression lets you keep more days of footage or higher resolution on the same disks. Our guide on 4MP vs. 8MP cameras explains how resolution interacts.

6. Rough Starting Points

As a rough starting point, many 4MP cameras do well at 3 to 6 Mbps at 15 fps with H.265, and 8MP cameras at 6 to 12 Mbps. Lower values may suffice in quiet scenes; higher values help in busy ones. These are not rules. Test your scene and adjust. A camera on a busy street needs more than one in a closet.

7. How to Calculate Storage

The simple formula is: total GB = cameras x Mbps x 10.8 x days. Example: eight cameras at 4 Mbps for 30 days is 8 x 4 x 10.8 x 30, or about 10,368 GB, roughly 10 TB. Add overhead for the recorder and spare capacity. If VBR averages lower than the cap, your real usage may be less, but plan for busy periods. Our guide on storage planning covers this in depth.

8. Detail, Motion and Night

Motion and noise need more bits. Night footage is noisy, and noise is expensive to compress, so night bitrates often spike. If a camera looks fine in daylight and poor at night, bitrate may be part of the cause, along with sensor and light. Our guide on sensor size and low light explains the other half.

9. Frame Rate and Bitrate

Higher frame rates add bits. A camera at 30 fps often needs more bitrate than one at 15 fps for the same quality. If you lower the frame rate to save storage, check that you do not also cap the bitrate too low. Our guide on frame rate explains how to choose.

10. Main Stream and Sub-Stream

Most cameras produce two streams: a main stream for recording and a sub-stream for live viewing on phones or multi-camera screens. Set the main stream for evidence quality and the sub-stream low to save bandwidth. Do not accidentally record the sub-stream, which looks soft. Check what the recorder is actually saving.

11. Network and Remote Viewing

Total bitrate across all cameras must fit within your switch, cable and recorder limits. For remote viewing, upload bandwidth matters. Many consumer connections have limited upload speeds, so streaming high bitrates remotely can stutter. Use the sub-stream for remote viewing and pull the main stream only when needed. Our local pages on security camera installation in Staten Island and home security camera installation in Suffolk County describe typical residential setups.

12. Business Considerations

Businesses often run more cameras and longer retention, so bitrate planning is crucial. A sixteen-camera system at 4 Mbps for 60 days needs about 41,472 GB, roughly 41 TB. Choose surveillance-rated drives, consider RAID for redundancy and keep clips tied to incidents longer. Our local page on commercial security camera installation in Brooklyn describes typical business setups.

13. Common Mistakes

Setting bitrate too low to save disk.
Using the default for every camera.
Recording the sub-stream.
Ignoring night bitrate spikes.
No cap on VBR.
Not checking codec support.
Not testing busy scenes.
Not documenting settings.

14. Cost

Planning ranges in 2026: extra storage, $100 to $600 per TB; surveillance-rated hard drive, $100 to $350 each; recorder rated for the total throughput, $300 to $2,500; managed PoE switch, $150 to $1,200; installed eight-camera system with 30 days of storage, $2,800 to $6,500; sixteen-camera system with 60 days, $7,000 to $17,000. These are planning ranges, not quotes.

15. A Second Data Point

NYPD reported burglary down 19.5% citywide in May 2026 compared with May 2025 (NYPD). Footage that is blocky at the key moment is of little use, so choose bitrate for evidence quality, not just disk savings.

16. Questions to Ask Your Installer

What bitrate and mode will each camera use?
How many days of footage will I get?
Which codec are you using and why?
How will busy and night scenes look?
Is the sub-stream separate from recording?
What happens when drives fill?

See our local pages for commercial security camera installation in Brooklyn, security camera installation in Staten Island, home security camera installation in Suffolk County and our services page.

Sizing a system? Revolvis will walk the property with you and mark the spots, and size storage to the footage you need.

17. A Hypothetical Storefront

A Brooklyn storefront has six cameras at CBR 2 Mbps and blocky footage at the register. Hypothetically, the installer switches to H.265 with VBR capped at 6 Mbps for the register and door cameras, 3 Mbps for the others, and adds a drive. Retention stays at 45 days, and the register footage becomes clear.

18. Testing Your Settings

Record a busy period and a night period. Review at full size. Check the register, the door and the farthest view. If detail is lost, raise the cap or the quality setting and recheck storage. Adjust until the footage is usable and the storage fits.

19. Documenting Your Settings

Write down each camera's resolution, frame rate, bitrate mode, cap and codec, plus the recorder settings and drive sizes. Keep the sheet with your recorder password. This makes future troubleshooting faster.

20. Deciding

Use VBR with a sensible cap for most systems, CBR when storage or bandwidth is strictly limited. Use H.265 if supported. Size storage for the busy case. The right bitrate keeps detail where it matters and fits your disks.

Seasonal Maintenance

Once or twice a year, clean lenses, check mounts and confirm recorder health. Review a week of footage for noise, gaps and false alerts. Foliage, snow and light change through the year, so a view that worked in summer may need adjustment in winter.

Keeping Records of the Layout

Keep a simple map of every camera, its location, lens, settings and switch port. When something changes or a camera misbehaves, the map turns a long search into a quick fix and helps the next technician understand the system, even months later.

More From Revolvis

Cameras are one layer of a secure property. The same in-house crew also handles the rest:

Learn more about Revolvis, meet the team, see all services, browse the blog or contact us.

Areas We Serve

Revolvis installs residential and commercial camera systems across the New York metro area. Every borough and county has its own building stock, rules and wiring challenges, so the plan for a Queens two-family is not the plan for a Manhattan co-op.

Staten Island: houses, detached garages and shop fronts. See security camera installation in Staten Island.
Brooklyn: brownstones, row houses and storefronts. See security camera installation in Brooklyn.
Queens: attached brick homes, two-families and busy commercial strips. See security camera installation in Queens.
The Bronx: pre-war buildings, bodegas and warehouses. See security camera installation in the Bronx.
Manhattan: co-ops, condos, offices and retail. See security camera installation in Manhattan.
Long Island: Nassau County and Suffolk County.
New Jersey: Jersey City, Newark, Hoboken and nearby towns.

The full list is on the service areas page.

Get a Custom Quote After a Site Visit

Revolvis prices every job after a site visit, because the building sets the cost as much as the equipment does. A few things make the estimate faster and more accurate:

The address and property type: house, apartment, co-op, condo, storefront or warehouse.
Which doors, sides and areas you want covered, and what worries you most.
Photos of those spots and any spots where you already have cabling or power.
How many days of footage you want to keep and whether you want to watch on your phone.
Any landlord, board, lender or insurer requirement.

Call 347-258-9165 or use the contact page to book a site visit. The quote you receive is written and itemized, so you can compare it line by line.

Frequently Asked Questions

What is bitrate? The amount of data per second a camera sends, usually in Mbps.

CBR or VBR? VBR with a cap suits most; CBR suits strict storage or bandwidth limits.

Does H.265 save storage? Often by a third or more versus H.264.

How do I calculate storage? Cameras x Mbps x 10.8 x days gives total GB.

Why is night video blocky? Noise is expensive to compress; bitrate and light both matter.

What is the sub-stream? A lower-quality stream for live viewing and remote access.

Ready for a custom quote? Call Revolvis at 347-258-9165 for a site visit and a written, itemized estimate.

Safety note: A camera system supports, but does not replace, good locks, lighting, alarms and everyday habits. If you are in danger or witnessing a crime, call 911. Prices and legal summaries in this guide are general information for the New York metro area, not an offer or legal advice. A written quote after a site visit governs your actual price, and for legal questions you should confirm with the agencies linked in the article or a licensed attorney.