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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →To stream a prerecorded video as a YouTube Live broadcast, you usually do not need to shrink the source file first. Add it to streaming software such as OBS, then encode its playback as a live signal using settings matched to the output resolution, frame rate, codec, and reliable upload bandwidth. To make a file smaller for a normal YouTube upload, use YouTube’s separate upload-encoding recommendations instead.
“Compress” can mean either reducing a file’s size before upload or encoding video in real time for a live broadcast. They are different jobs: a smaller source file does not set the live stream’s bitrate, and no setting can guarantee zero quality loss. YouTube transcodes incoming live video into formats for viewers, so the aim is to avoid unnecessary loss and buffering at ingest.
First decide which kind of compression you need
Prerecorded video broadcast as a live stream
Streaming software plays the local file and sends its playback to YouTube as a live signal. You set the outgoing live encoder’s format and bitrate; the source file’s size does not determine those settings. YouTube’s live encoder guidance describes the incoming stream requirements and recommendations.
Ordinary video upload
If you want to upload a finished video rather than broadcast it live, follow YouTube’s separate video upload encoding recommendations. Re-encoding can reduce file size, but it can also reduce quality; the right trade-off depends on the source and intended output.
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Prepare the source and output before choosing settings
Check the source file’s resolution, frame rate, codec, audio layout, and whether it is HDR or SDR. Decide whether the destination is a live broadcast or a normal upload, and what output resolution and frame rate you intend to send. Without those details, there is no reliable per-file compression recipe.
For a live broadcast, add the file as a media source in OBS and configure it to loop if needed. OBS documents these controls in its Media Sources guide. A local video file does not require a capture card.
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Set YouTube Live encoding settings
YouTube’s recommendations below are for RTMP/RTMPS ingest. The bitrate is the recommended live input bitrate, not a promise of visually lossless output. Select the row matching the output resolution and frame rate, then confirm your encoder supports the selected codec and your connection can sustain the bitrate with headroom.
| Output resolution and frame rate | AV1 or H.265/HEVC | H.264 |
|---|---|---|
| 4K/2160p, 60 fps | 35 Mbps | 50 Mbps |
| 4K/2160p, 30 fps | 30 Mbps | 42 Mbps |
| 1440p, 60 fps | 24 Mbps | 34 Mbps |
| 1440p, 30 fps | 15 Mbps | 21 Mbps |
| 1080p, 60 fps | 12 Mbps | 17 Mbps |
| 1080p, 30 fps | 10 Mbps | 14 Mbps |
| 720p, 60 fps | 6 Mbps | 8 Mbps |
| 720p, 30 fps | 6 Mbps | 8 Mbps |
| 480p, 30 fps | 3 Mbps | 4 Mbps |
| 360p, 30 fps | 3 Mbps | 4 Mbps |
These are YouTube’s published recommendations, checked October 3, 2026, not independent quality tests. Recommendations can change; consult YouTube’s live encoder guidance when configuring a stream.
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Protocol, codec, and keyframes
- YouTube lists H.264, H.265/HEVC, and AV1 for RTMP/RTMPS ingest, supports up to 60 fps, recommends constant bitrate (CBR), and recommends a two-second keyframe interval, not exceeding four seconds.
- YouTube recommends RTMPS. Match the encoder’s codec and output settings to the ingest protocol you choose.
- For HDR or codecs unavailable over RTMP, YouTube says HLS may be appropriate. HLS has higher latency because it sends video in segments; account for that delay if a near-real-time broadcast matters.
- YouTube’s low-latency option is unavailable for 4K/2160p. Lower latency also means less read-ahead buffer and can increase buffering risk.
Audio and picture format
- For RTMP/RTMPS, YouTube lists AAC or MP3 audio; 5.1 surround is supported only with AAC.
- Its listed audio recommendations are stereo at 128 kbps and 44.1 kHz, or 5.1 at 384 kbps and 48 kHz.
- YouTube specifies square pixels and progressive scan. For SDR it specifies Rec. 709; SDR is 8-bit and HDR is 10-bit.
- YouTube recommends H.265/HEVC for HDR over RTMP(S); AV1 is not supported for HDR. Preserve the source’s HDR/SDR status when choosing an output workflow.
YouTube also lists two B-frames, one reference frame, and CABAC among its encoder settings. Check that the selected encoder exposes compatible values rather than assuming every preset uses them.
Configure the stream and test it before going live
- In OBS, add the file: open the scene where the video should appear, add a Media Source, select the file, and enable looping if the broadcast should repeat. Confirm the video and audio play as expected.
- Set the output: choose a resolution, frame rate, codec, and protocol supported by YouTube and your encoder. Use CBR and a two-second keyframe interval, with the interval no longer than four seconds.
- Choose the bitrate: use the matching YouTube recommendation in the table. Do not select a bitrate solely because the source file is large or small.
- Connect the broadcast: use the stream key and ingest settings shown in YouTube’s live control room. Keep the key private; anyone who obtains it may be able to broadcast to your channel.
- Check bandwidth: run an upload speed test and leave dependable headroom above the chosen bitrate for network variation and other traffic. A headline speed-test result is not proof that the connection will remain stable for the whole broadcast.
- Run a representative preflight: test a section with the same motion, detail, and audio as the intended content. Check YouTube’s stream health and watch for dropped frames, buffering, or audio problems before relying on the setup.
What affects quality—and what you can control
There is no universal setting that preserves every source perfectly. Results depend on the original footage, motion and fine detail, the output codec and bitrate, encoder performance, and delivery conditions. A low-motion slide show and fast-moving footage may behave differently at the same resolution and bitrate.
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The bitrate table helps configure the signal YouTube receives; it does not let you prescribe every format each viewer will watch. YouTube transcodes live input into multiple viewer formats. Test the actual video and monitor stream health rather than treating any bitrate as a guarantee.
Hardware encoding can move encoding work from the CPU to a specialized component in a GPU. OBS documents its available encoder options; that performance allocation alone does not establish a universal quality advantage over another encoder.
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Troubleshoot common live-stream problems
- Stream health reports instability or viewers buffer: the connection may not sustain the selected bitrate consistently. Test upload performance, reduce the output bitrate or resolution if needed, and repeat a preflight. Do not compensate by making the source file smaller; that does not change the live encoder’s output bitrate.
- YouTube rejects the stream or reports an encoding problem: check the codec and protocol combination, CBR setting, frame rate, keyframe interval, audio codec, and output format against YouTube’s current guidance. For HDR, check the HLS/RTMP(S) and codec restrictions.
- The stream looks softer than the file: confirm that the output resolution and frame rate match the intended stream, that the bitrate fits the table, and that the source is not already low-resolution or heavily compressed. YouTube’s transcoding means the viewer rendition may not be identical to the local file.
- The video stops instead of looping: check the Media Source’s loop option and verify the source file plays to its end in OBS. If the scene changes or the source is removed, the stream may no longer show the expected footage.
- Audio is missing or out of sync: confirm the media source’s audio is enabled and that the outgoing audio codec and channel layout are supported. Test a representative segment before the broadcast.
- Delay is too high, or low-latency mode buffers: choose the latency setting according to the broadcast’s interaction needs and tolerance for buffering. HLS introduces more latency; YouTube’s low-latency option is not available at 4K/2160p.
Copyright and channel-policy checks
Using prerecorded footage in a live broadcast does not remove copyright obligations. Make sure you have the rights or permissions needed for the video, music, and other material, and review YouTube’s copyright and monetization rules before scheduling a long or repeated stream. A technically valid stream is not a guarantee that content is permitted or eligible for monetization.
Or let it run in the cloud
If you want a prerecorded YouTube stream to keep running without leaving a home computer on, StreamNeo is a cloud option: upload your video or build a playlist, add your YouTube stream key once, and go live. StreamNeo loops uploaded videos from the cloud; it does not broadcast from a camera.
Quick Recap
- Nothing has to stay on at home; the stream runs from the cloud.
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