Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteAn MP4 file can grow after FFmpeg re-encoding because MP4 is only a container: the encoded video and audio streams determine most of the size. A higher bitrate or quality target, a less efficient codec, larger dimensions or frame rate, or extra streams can outweigh any savings from re-encoding. Compare the source and output settings before changing the command; the “.mp4” extension alone says nothing about expected size.
What determines an MP4 file’s size?
A rough estimate for the main streams is: size in bytes ≈ total bitrate in bits per second × duration in seconds ÷ 8. Container overhead is usually smaller than the video stream, but audio and any retained subtitles or other streams add to the total. A new encode is not inherently smaller: it only becomes smaller if its encoded streams use fewer bits overall.
Re-encoding an already compressed source can also make a visually similar file larger. The source may use a more efficient codec or settings than the output, and another lossy encode cannot recover detail already discarded.
Compare the source and output before changing settings
Use ffprobe on both files, or inspect them in a media-information tool. For a concise stream and format summary, run:
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
ffprobe -v error -show_entries format=duration,size,bit_rate:stream=index,codec_type,codec_name,profile,width,height,r_frame_rate,avg_frame_rate,bit_rate,sample_rate,channels -of json input.mp4
Replace input.mp4 with each filename. Some files or streams do not report every bitrate or metadata field; treat missing values as unknown, not zero. Compare these details:
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
- Video codec and bitrate: Check whether the output codec is less efficient than the source and whether the output video bitrate is higher. Container-level bitrate includes all streams, so compare video with video where possible.
- Quality and rate-control options: Inspect the actual command for
-crfand-b:v. With libx264, a lower CRF targets higher quality and commonly produces a higher bitrate; a higher CRF targets lower quality and smaller output. CRF does not promise a particular file size. - Preset: Faster libx264 presets can compress less efficiently at similar visual quality. A slower preset may reduce size for comparable quality, at the cost of more encoding time.
- Dimensions and frame rate: Look for changes from scaling filters, frame-rate conversion, or different output settings. More pixels or frames per second can increase the amount of encoded data.
- Audio: Check codec, bitrate, channel count, and sample rate. Audio may have been re-encoded at a higher bitrate, changed to more channels, or retained alongside additional audio streams.
- Stream count: Check for subtitles, alternate audio, data, or other streams copied into the output. They contribute to the file even if the video itself did not grow.
Then inspect the full FFmpeg command, especially -c:v, -crf, -preset, -b:v, scaling or frame-rate filters, audio options, and any stream-mapping options. This comparison identifies what changed; without the source file and command, no exact cause or output size can be diagnosed.
How YouTube’s upload recommendations fit in
YouTube lists MP4 as a container and H.264 as a video codec, and recommends retaining the frame rate used for recording. Its bitrate figures are reference recommendations for uploads, not hard caps or guarantees of a particular file size. For SDR video, YouTube’s current upload encoding recommendations (accessed 2026) list:
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
| Resolution and frame rate | Recommended bitrate |
|---|---|
| 1080p at 24, 25, or 30 fps | 8 Mbps |
| 1080p at 48, 50, or 60 fps | 12 Mbps |
| 720p at standard frame rate | 5 Mbps |
| 720p at high frame rate | 7.5 Mbps |
These figures help orient an upload export, but they are not instructions to cap every file at those bitrates. YouTube says, “YouTube will still accept your video content and then re-encode your video files as necessary.” The uploaded file’s size therefore does not determine the size or quality of the playback rendition viewers receive. See YouTube’s Video and audio formatting specifications.
How to reduce size without guessing
- Preserve the source dimensions and frame rate unless they are unnecessarily high for the intended video. Changing either can affect detail or motion as well as size.
- For libx264, raise CRF in small steps and review the output at representative scenes. Higher CRF usually means smaller output, but also lower quality; the right setting depends on the content and acceptable visual loss.
- Try a slower preset if encoding time allows. It can improve compression efficiency at similar quality, but it is not a guarantee of a smaller file in every case.
- Check audio and stream mapping. Avoid keeping unwanted alternate tracks or subtitles, and do not raise audio bitrate or channel count without a reason. If you need those streams, account for their size rather than treating them as video overhead.
- If size or average bitrate must be predictable, use explicit bitrate-based rate control. Choose a target appropriate to duration, quality, and delivery needs; CRF alone cannot guarantee a specific size.
- Compare the result visually and technically. Check the new file’s duration, resolution, frame rate, streams, and bitrate alongside representative footage. Smaller is not automatically better if the output has lost needed detail or compatibility.
Or let it run in the cloud
If your goal is to keep uploaded videos playing as a YouTube live stream rather than simply make an upload file smaller, StreamNeo is a separate option: upload a recording or build a playlist, add your YouTube stream key, and go live. Nothing has to stay on at home; the cloud loops your uploaded video, automatically recovers if YouTube drops the stream, and accepts your file as made up to 4K 60fps at one flat price per slot. The first day is free with no card. Monthly: $9.99 per month. Learn more at StreamNeo, or start the free day.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
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.
