To scale a relaxation video for YouTube without distorting it, fit it inside your target frame while preserving its display aspect ratio. For a 16:9 stream up to 1080p, use FFmpeg’s scale=1920:1080:force_original_aspect_ratio=decrease:force_divisible_by=2 filter; add padding if the output must always be exactly 1920×1080. Scaling controls the video dimensions—it does not keep an FFmpeg process or internet connection running 24/7.
Choose how the source should fit the stream frame
First inspect the source rather than assuming its stored dimensions describe how it should look. A video’s display aspect ratio (DAR) is the shape viewers see; its sample aspect ratio (SAR) describes the shape of its pixels. An older or anamorphic source may have non-square pixels, so check the display aspect ratio and pixel format with ffprobe before choosing a filter. FFmpeg’s FAQ explains that scaling adjusts SAR to preserve DAR: FFmpeg FAQ.
Fit the complete image inside a 16:9 canvas
For sources with varying aspect ratios, this filter scales the image to fit within 1920×1080 while retaining its original proportions:
scale=1920:1080:force_original_aspect_ratio=decrease:force_divisible_by=2
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The decrease mode reduces one or both dimensions as needed to fit the box. The result may be smaller than 1920×1080 in one dimension; this filter alone does not fill the unused area. The divisibility option requests even output dimensions, a useful constraint for many video encoders.
Pad the fitted image to an exact 1920×1080 output
If you need a fixed 16:9 output frame while preserving every part of a differently shaped source, scale first and then add a background around it:
-vf "scale=1920:1080:force_original_aspect_ratio=decrease:force_divisible_by=2,pad=1920:1080:(ow-iw)/2:(oh-ih)/2"
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This centers the fitted image in the output canvas. The padding color is not specified in this example, so choose and test a background treatment appropriate for the visual. For a verified 16:9 source, the simpler scale=1920:1080 may be sufficient.
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- Fit and pad: preserves the whole image, but may leave bars or background space.
- Crop to fill: fills the frame by cutting off part of the image. Use it only when the lost edges are acceptable.
- Stretch: changes the image’s proportions. Avoid it for non-16:9 material unless that distortion is intentional.
FFmpeg also documents force_original_aspect_ratio=increase, which enlarges dimensions to cover the box; a filled frame may then require cropping. Check the behavior against the FFmpeg version installed on your system because the online filter documentation reflects the newest revision: FFmpeg scale filter documentation.
Check the source before rendering
- Run
ffprobe -v error -show_streams -show_format input.mp4, replacinginput.mp4with your file. Review the video stream’s dimensions, pixel format and aspect-ratio metadata. - Decide whether the full visual must remain visible. Choose fit-plus-padding to preserve it, or crop-to-fill only if losing edges is acceptable.
- Render a representative segment and inspect it at the intended output size. Confirm that circles remain circular, text is legible, and no important detail is clipped.
- Check the output’s dimensions and playback before using it in a live stream. The filter examples are configuration patterns, not tested commands for every input, encoder, GPU or FFmpeg build.
If the picture looks distorted despite a sensible scale filter, inspect the source’s aspect-ratio metadata. Scaling does not necessarily correct incorrect metadata. FFmpeg documents setsar and setdar for intentional corrections; change them only after establishing the correct display shape. Upscaling a smaller source increases its dimensions but cannot create genuine detail absent from the original.
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Choose resolution, codec and bitrate together
YouTube’s ingest recommendations vary by codec, resolution and frame rate. The figures below are its current H.264 recommendations accessed in 2026, not universal guarantees of quality or mandatory settings:
| Output | Codec and frame rate | YouTube recommended bitrate |
|---|---|---|
| 1080p | H.264, 30 fps | 14 Mbps |
| 720p | H.264, 30 fps | 8 Mbps |
| 480p | H.264, 30 fps | 4 Mbps |
These numbers are specifically for H.264 at 30 fps. YouTube’s recommendations differ for H.265/HEVC and AV1. Do not copy an H.264 figure to a different codec or frame rate without checking YouTube’s current table: YouTube Help: Choose live encoder settings, bitrates, and resolutions.
Scaling to 1080p is not automatically better if the source is lower resolution or the upload connection cannot sustain the chosen stream. Match the ingest resolution to the source, encoder capacity and available upload bandwidth. For an always-on stream, leave capacity for connection variation rather than treating a recommendation as proof that a home connection will remain stable.
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Set the encoder for YouTube Live
YouTube’s live-encoder guidance lists H.264, H.265/HEVC and AV1 for RTMP/RTMPS streaming, frame rates up to 60 fps, constant bitrate (CBR) encoding, and a recommended two-second keyframe interval that should not exceed four seconds. For SDR, it also recommends square pixels, progressive scan, Rec. 709 and 8-bit depth. Choose settings supported by your encoder and suited to your stream; verify current guidance before going live.
- Transport: Prefer RTMPS, which YouTube says encrypts data to and through Google’s servers.
- Keyframes: Use a two-second interval as recommended; do not exceed four seconds.
- Rate control: Use CBR and set a bitrate appropriate to the selected codec, resolution and frame rate.
- Picture format: Use progressive scan and square pixels; for SDR, use Rec. 709 and 8-bit depth as recommended.
YouTube automatically detects encoder settings in Live Control Room by default and transcodes a live stream into output formats for viewers on different devices and networks. That does not eliminate the need to configure a compatible input stream or check its health.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test the stream before leaving it unattended
- Run a speed test from the network that will carry the stream. Confirm that upload capacity is suitable for the selected bitrate.
- Start a preflight test with representative audio and motion, not just a still frame. Check the picture shape, audio, stream health and YouTube’s encoder messages in Live Control Room.
- Monitor stream health after going live and respond to warnings rather than assuming a correct scaling filter guarantees a stable broadcast.
- Confirm that you have the right to use the video and audio. A technically valid stream does not establish copyright permission or compliance with YouTube rules on reused content.
YouTube’s encoder guidance recommends testing and monitoring stream health. Its transcoding creates viewer output formats, but it does not promise an uninterrupted source feed.
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Why scaling alone cannot make a stream 24/7
The scale filter changes video dimensions; it does not provide process supervision, an uninterrupted internet connection, automatic restart or a recovery plan if YouTube drops the stream. A self-hosted FFmpeg setup depends on the machine, encoder and network staying available, and the filter examples above are not an end-to-end reliability configuration. Plan how the process will be monitored and restarted, and test failure recovery before relying on it unattended.
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