What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Use FFmpeg’s -stream_loop to repeat the whole input, and re-encode with an output frame rate to make the result constant-frame-rate (CFR). For example, -stream_loop -1 loops forever; -r 30 targets 30 fps. Keep the input’s actual intended frame rate unless you have a reason to convert it: YouTube recommends encoding and uploading at the rate the video was recorded.
Loop the whole video and encode at a constant frame rate
This example makes a one-hour MP4 from an input with video and possibly audio. It targets 30 fps; replace that with the source’s intended frame rate and change 3600 to the desired duration in seconds.
As an Amazon Associate I earn from qualifying purchases.
ffmpeg -stream_loop -1 -i input.mp4 -map 0:v:0 -map '0:a?' -t 3600
-c:v libx264 -r 30 -pix_fmt yuv420p
-c:a aac -movflags +faststart output.mp4-stream_loop -1repeats the entire input indefinitely. It is an input option, so place it before-i.-map 0:v:0selects the first video stream.-map '0:a?'selects audio if present, but does not fail if the input has none.-t 3600limits the output to 3,600 seconds, or one hour.-c:v libx264encodes the video as H.264;-r 30sets the requested output rate during encoding.-pix_fmt yuv420pselects a widely compatible pixel format, while-c:a aacencodes audio as AAC.-movflags +faststartmoves MP4 metadata toward the start of the file for playback convenience.
This is an illustrative starting point, not a tested command for every input. Inspect the source streams and review the finished file, especially if it has unusual timestamps, variable frame rate, multiple tracks, or an audible or visible seam where the loop restarts.
Recommended Free Tools
Choose the right frame rate before encoding
Preserve the recorded rate when possible
YouTube Help says: “Content should be encoded and uploaded in the same frame rate it was recorded.” Its listed common rates are 24, 25, 30, 48, 50, and 60 fps; other rates are acceptable too. If the source rate is fractional, use its actual rational value—for example, 30000/1001 rather than rounding it to 30—when that is the intended rate.
#1 Best Overall
- Legend perfected: Modern design with a matte basalt black finish in an optimized chassis with customizable AlienFX lighting zones, including the striking stadium lighting.
- Game changing graphics: Step into the future of gaming and creation with the NVIDIA GeForce RTX 5070 graphics, powered by NVIDIA Blackwell architecture.
- Marathon gaming unlocked: This high-performance technology ensures clean energy is consistently available, unleashing the top-level power of Intel Core Ultra 7 265F processor as you game, livestream, and multi-task for hours on end.
- Total command: Alienware Command Center software allows you to create and edit AlienFX lighting across the ecosystem, choose and monitor your performance mode across distinct power states, and create custom gaming profiles for your whole library.
- Dell Services: 1 Year Onsite Service provides support when and where you need it. Dell will come to your home, office, or location of choice, if an issue covered by Limited Hardware Warranty cannot be resolved remotely.
Know what changing the rate does
When FFmpeg re-encodes, output -r duplicates or drops frames to reach the requested rate. It does not create genuinely new motion. Converting a 24 fps source to 30 fps, for example, requires a different frame cadence; the new frames may be repeats. Avoid choosing an arbitrary rate merely to meet a supposed YouTube requirement.
You can also express constant-rate synchronization explicitly with -fps_mode cfr, alongside an output rate, such as -r 30 -fps_mode cfr. FFmpeg defines CFR mode as duplicating or dropping frames to attain the requested constant rate.
Rank #2
- Model: Dell OptiPlex 7050 Small Form Factor (SFF)
- Processor: Intel Core i7-7700 3.60 GHz
- Memory: 32GB DDR4 Ram
- Storage: 1TB Solid State Drive (SSD) Fast Boot + Storage
- Operating System: Windows 11 Pro (64-bit)
Why stream copy does not make frame rate constant
Stream copy, such as -c:v copy, passes the encoded video through without decoding and re-encoding its frames. It therefore cannot duplicate or drop frames to change cadence. In this mode, output -r only signals a rate to the muxer; if that rate conflicts with packet timestamps, the file may be invalid. Use stream copy when preserving the existing encoded stream matters and its cadence is already suitable—not as a frame-rate conversion method.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Repeat the whole input or loop selected frames
| Method | What repeats | Best fit |
|---|---|---|
-stream_loop |
The complete input file | Repeating a full video or building a longer output from it |
Video loop filter |
Selected frames | Frame-level looping effects or repeating a short section of frames |
For a finite number of input repetitions, replace -1 with the desired loop count. FFmpeg defines 0 as no repetition and -1 as infinite repetition. The loop filter is a separate frame-level tool; for ordinary whole-file repetition, -stream_loop is the direct option.
Rank #3
- 【POWERFUL PERFORMANCE】 – AMD Ryzen 5 5500 6-Core 12-Thread Desktop Processor (up to 4.2GHz). Effortlessly handle 3A games, 4K video editing, and multitasking.
- 【SMOOTH GAMING】 – Equipped with GeForce RTX 3050 6GB GDDR6 Graphics Card. Experience high-frame-rate 1080P gaming with ray tracing.
- 【FAST & AMPLE STORAGE】 – 16GB DDR4 3200MHz RAM + 1TB NVMe SSD. Enjoy rapid game loads, quick file transfers, and ample space for your entire library.
- 【KEEP COOL】 – Advanced ARGB air cooling system with multiple fans. Maintains stable performance and low noise even during marathon gaming sessions.
- 【READY TO USE】 – Features built-in Wi-Fi, multiple USB ports, HDMI and DisplayPort (DP) outputs for flexible monitor connectivity. A complete prebuilt gaming computer, plug and play right out of the box.
Check YouTube’s upload recommendations separately
Looping and frame-rate conversion control how FFmpeg builds the file. YouTube’s other upload recommendations concern the encoded file’s compatibility and quality, not the loop operation itself. For video uploads, YouTube recommends MP4, H.264, progressive scan, High Profile, two consecutive B-frames, a closed GOP with a GOP length of half the frame rate, CABAC, and 4:2:0 chroma subsampling. For standard dynamic-range video, it recommends BT.709 color space.
YouTube’s recommended SDR bitrates vary by resolution and frame-rate group. Examples are 8 Mbps for 1080p at standard frame rates and 12 Mbps for 1080p at high frame rates; for 2160p/4K, the corresponding recommendations are 35–45 Mbps and 53–68 Mbps. These are recommendations, not guaranteed quality levels or mandatory fixed rates.
Rank #4
- Intel Core i9-14900KF CPU, B760 chipset motherboard, 32GB DDR5 6000MT/s RGB Memory, 1TB NVMe M.2, WiFi, Windows 11
- NVIDIA GeForce RTX 5070, Display Port/HDMI
- Closed Loop Liquid Cooling with 240mm Radiator
- 2x USB 3.0, 1x Headphone, 1x Mic
- PSU Power cover with Filtered Ventilated Vertical Side mount Radiator support
Troubleshoot common results
- The video still has variable frame rate: confirm that FFmpeg is re-encoding and that an output rate or CFR mode is set. Stream copy does not reshape frame cadence.
- The output duration is wrong: check
-tand express it in seconds for this example. Verify that the input can be read repeatedly and inspect timestamps if the source has unusual timing. - There is no audio: the optional audio map allows silent inputs, so an output without audio may be expected. If the source has multiple audio tracks, this example selects only the first.
- The loop restart is abrupt or clicks: inspect the transition between the end and start of the source. A whole-file loop repeats that seam; the command does not smooth it.
- Playback or upload compatibility is poor: check the output container, codec, scan type, pixel format, and color space against YouTube’s upload guidance, and review the encoded file before uploading.
Or let it run in the cloud
If your goal is a 24/7 YouTube stream from uploaded videos rather than a finished file to upload, StreamNeo can keep the loop running without a computer or home connection staying on. Upload a recording or build a playlist, add your YouTube stream key once, and go live. It streams the uploaded video as made, up to 4K 60fps, at one flat price per slot; it does not re-encode. It can automatically recover if YouTube drops the stream. The first day is free with no card, one free day per account. Monthly service is $9.99 per month. StreamNeo streams to YouTube only. Learn about StreamNeo, or start the free day.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Quick Recap
Best Value
- Content Creation Workstation PC: Powered by the Intel Hexa-Core i5 (8th Gen) processor with 32GB DDR4 RAM and NVIDIA's Quadro K1200 4GB Graphics Card, this Workstation PC Computer is built for creative environments
- NVIDIA's Quadro K1200 4GB Graphics Card: Graphic support built to be an efficient workstation for creative applications like photo and video editing, 3D Design, AutoCAD, and much more
- Software Compatibility: Workstation PC for use with independent software vendors (ISV) and certified for use with modeling, rendering, and engineering software from Adobe, AutoCAD, 3DS Max, and many more
- Massive Storage Solutions: An ultra-fast 1TB Solid State Drive (SSD) setup as the primary boot device; Boot and load programs with little to no lag; An additional 4TB Hard Disk Drive (HDD) is installed for additional storage; Never run out of storage
- Connectivity for Creative Projects: USB 3.0 (x5) | USB 2.0 (x4) | USB Type-C (x1) | DisplayPort (x2) | Serial Port (x1) | VGA Port (x1) | Audio Combo Jack (x1) | Audio In (x1) | Audio Out (x1) | RJ-45 Ethernet (x1) | Internal SATA (x3)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
