The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →To make an MP4 smaller without changing its resolution, re-encode it at a lower video bitrate while keeping its width and height fixed. The picture keeps the same pixel dimensions, but lower bitrate can reduce visible detail or introduce compression artifacts. For a 24/7 YouTube stream, check that the resulting file and your playback-to-ingest setup meet YouTube’s current requirements, then test the stream before relying on it.
Resolution and bitrate control different things
Resolution is the frame’s pixel dimensions, such as 1920 × 1080. Bitrate is the amount of encoded data used over time. Lowering the bitrate can reduce file size while preserving those dimensions; it does not preserve the original image quality automatically.
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Changing the codec can also affect size, but changing a codec or container alone does not guarantee a smaller file. The result depends on the encoder, content, bitrate and quality target. A different codec must also be supported by the playback and streaming path as well as YouTube’s ingest settings.
Estimate the file size you need
Use the total bitrate and video duration for a rough estimate:
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Approximate file size in bytes = (video bitrate + audio bitrate) × duration in seconds ÷ 8.
For example, at a combined 5,000,000 bits per second for one hour: 5,000,000 × 3,600 ÷ 8 = 2,250,000,000 bytes, or roughly 2.25 GB in decimal units. The actual MP4 will be somewhat larger because of container overhead. This calculation estimates storage, not visual quality.
Rank #2
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Reduce the file size without resizing it
1. Record the source settings
Before encoding, note the MP4’s width and height, frame rate, video and audio codecs, duration, and current bitrate. This gives you a baseline and helps you catch accidental changes in output.
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2. Keep the output dimensions unchanged
In your video editor or encoder, set output width and height to match the source exactly. Do not select a resize, downscale or “fit to” option. To make the file smaller, lower the video bitrate or use a more efficient codec only if every part of your playback-to-YouTube path supports it.
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3. Compare a lower-bitrate encode
Make a test output rather than replacing your original. Compare the source and output at the same display size, paying particular attention to movement, fine detail and gradients, where compression damage can be noticeable. Listen to the audio as well. Lower the bitrate in measured steps until the size and quality are acceptable; there is no single bitrate that suits every video.
4. Confirm YouTube’s current ingest settings
YouTube’s live encoder guidance supports RTMP/RTMPS; H.264, H.265 (HEVC) or AV1 video; AAC or MP3 audio; and frame rates up to 60 fps. It specifies constant-bitrate encoding and recommends a 2-second keyframe interval, not exceeding 4 seconds. For stereo audio, YouTube recommends 128 Kbps. The recommended video bitrate depends on codec, resolution and frame rate, so consult the current table for the account and region you are using rather than treating one target as universal. YouTube’s live encoder settings and bitrate guidance was checked on October 4, 2026.
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5. Check upload capacity and test the live path
The outgoing stream’s total bitrate, including audio, must fit within the available upload bandwidth, with capacity left for other network traffic. YouTube notes that the total bitrate cannot exceed available upload bandwidth. YouTube recommends testing before going live; use representative motion and audio, then review stream health and error messages. YouTube identifies unsupported codecs and bitrate mismatch among possible streaming issues. See its live stream error guidance and streaming tips.
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What to validate for a 24/7 stream
A smaller MP4 can reduce storage use and the bitrate needed to send the stream, but it does not guarantee uninterrupted playback. YouTube’s encoder guidance does not promise 24/7 looping for a particular file. Continuity also depends on the playback or encoder software, host power, network and recovery behavior.
Best Value
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- Verify that the player or encoder loops or restarts the content as intended.
- Check that the host remains powered, the file remains available, and the network can sustain the full outgoing bitrate.
- Test recovery behavior if the encoder process stops or YouTube disconnects the stream.
- Run a representative test stream and review YouTube’s stream-health signals before using the setup continuously.
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Quick Recap
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