You can rotate a prerecorded video before sending it to YouTube Live by decoding it in FFmpeg, applying a video-rotation filter, encoding the result, and sending the output to YouTube with a current RTMPS server URL and stream key. If you want the file to repeat, configure looping separately from the rotation and streaming steps. The exact command depends on your Pi, operating system, FFmpeg build, input file, and target format; the workflow below explains what to set and what to test without presenting an unverified command as a guaranteed recipe.
What you need to decide before streaming
Rotation is a video-processing step, not a YouTube Live setting. First check the file itself: confirm whether its pixels are already in the intended orientation or whether the player is displaying it upright because of rotation metadata. Then choose whether you want to rotate the picture or fit it into a target canvas. Those are different operations: fitting or cropping can change framing, while rotation changes the direction of the image.
- Orientation: Decide whether the live output should be landscape or portrait, and inspect the result rather than relying only on how a desktop player displays the source.
- Output dimensions and frame rate: Choose the intended YouTube output before encoding. A rotated portrait source does not automatically mean that every source dimension or frame rate is appropriate for your output.
- Looping: Decide whether the file should play once or repeat. Looping the file and connecting an encoder to YouTube are separate jobs.
- Pi capacity: Determine whether the board and FFmpeg build can process and encode the rotated video continuously at your chosen settings. YouTube’s recommended ingest bitrate is not a performance guarantee for a Raspberry Pi.
FFmpeg documents video filters, including transpose-related filters, in its filter reference. Apply the appropriate rotation filter to decoded video, and inspect the output orientation before going live. A filter that changes the picture requires video processing and generally re-encoding; do not assume stream copy can perform an arbitrary rotation operation.
Prepare the Raspberry Pi
Install Raspberry Pi OS on boot media and use a power supply appropriate for your specific board. Raspberry Pi’s getting-started documentation recommends at least 8 GB of boot-media capacity for Raspberry Pi OS Lite and at least 32 GB for the Desktop and Full images. Those figures cover the operating system, not a video archive; size storage separately if the source library will live on the Pi.
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For a headless setup, Raspberry Pi OS Lite is an option; arrange remote access using SSH or Raspberry Pi Connect if you need to administer the Pi without a display. Use Ethernet or Wi-Fi with stable upload capacity. These setup recommendations do not establish that a particular Pi model can encode a particular rotated resolution and frame rate.
Build the rotate-and-stream workflow
- Install and inspect FFmpeg. Use a package or build that is available for your operating system and includes the encoders and filters you need. Check the FFmpeg version and build configuration; hardware-encoder availability and filter support vary.
- Inspect the source. Record its codec, dimensions, frame rate, audio format, and orientation as displayed by a player. Check a representative section with movement and sound. If the image is already physically rotated, applying another rotation will turn it again.
- Set the video filter. Apply a transpose-related rotation filter to decoded frames. If the desired presentation is instead a portrait or landscape canvas with scaling, padding, or cropping, plan that separately and check that important content remains in frame.
- Choose the output encode. Rotation means the video usually needs to be encoded again. Select an encoder that your Pi and FFmpeg build actually provide, then choose output resolution, frame rate, bitrate mode, and audio settings. Do not select a target solely because YouTube accepts it; test whether the Pi can sustain it.
- Configure repetition if needed. Set the file input to loop using behavior supported by your FFmpeg build. Test the transition between repetitions for a visible gap, timestamp discontinuity, audio cut, or other unwanted change. Rotation and looping are distinct settings, and a loop option alone does not ensure a seamless audiovisual repeat.
- Get the live endpoint and key. In YouTube Live Control Room, create or select the live stream and copy the current server URL and stream key into the encoder. YouTube’s instructions say: “To start streaming, enter your YouTube Live server URL and stream key into your encoder.” Prefer the current RTMPS endpoint shown for your stream over an address copied from an old tutorial. Never publish or expose the key.
- Start a test broadcast. Run the complete input, rotation, optional looping, encoding, and network workflow before the planned stream. Confirm the picture’s orientation and framing, audio continuity, and YouTube’s stream health and status messages while it runs.
This is a workflow, not a tested command for every Pi. FFmpeg option syntax, looping behavior, encoders, and performance depend on the package build, board, input, and target. A reliable hardware-specific recipe should name the tested Pi model, OS, FFmpeg version and build, source codec, output dimensions and frame rate, and observed stability.
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Choose YouTube Live output settings
YouTube’s current encoder settings guide supports H.264, H.265/HEVC, and AV1 ingestion, up to 60 fps, with CBR and AAC or MP3 audio. It recommends a two-second keyframe interval and says not to exceed four seconds. Its H.264 bitrate recommendations include these targets:
| Output | YouTube-recommended H.264 bitrate |
|---|---|
| 720p at 30 fps | 5 Mbps |
| 720p at 60 fps | 8 Mbps |
| 1080p at 30 fps | 10 Mbps |
| 1080p at 60 fps | 17 Mbps |
These are YouTube ingest recommendations, not measurements of Raspberry Pi encoding capability or guarantees that a particular internet connection can sustain the stream. Check the bitrate for your chosen codec, resolution, and frame rate in YouTube’s table; the values above are specifically the listed H.264 targets. Your stable upload capacity must also accommodate the outgoing stream. YouTube transcodes the incoming live video for viewers, so the encoder sends one selected output rather than preparing a separate rendition for every viewer.
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YouTube recommends RTMPS, a secure extension of RTMP. Google’s RTMPS ingestion guide specifies an RTMPS URL, a valid YouTube ingestion endpoint and application path, and port 443. For ordinary user content, YouTube describes RTMPS as a good choice, particularly when low latency is needed. In practice, copy the current endpoint and key from Live Control Room rather than hard-coding a URL from an older tutorial.
Test for the problems that matter
Test with movement and audio similar to what you intend to broadcast, as YouTube advises. Keep the stream open long enough to check sustained operation and, if repeating the file, at least one loop transition. Watch YouTube’s stream health and status messages during the test.
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- Picture is sideways or upside down: Recheck the source’s displayed orientation and any rotation metadata, then verify the filter direction and output before streaming.
- Portrait framing is wrong: Rotation alone does not decide how the picture fits the output canvas. Revisit the scaling, padding, or cropping choice and inspect important edges of the frame.
- Stream health reports instability: Compare the selected bitrate with measured, stable upload capacity. Check whether the Pi can sustain the encode; a platform bitrate recommendation cannot diagnose local CPU, encoder, thermal, or network limits.
- Playback stutters or the Pi falls behind: Reassess the target resolution, frame rate, filter workload, and available encoder in your actual FFmpeg build. The sources do not establish workload-specific performance for any Pi model, so validate the complete setup on your board.
- A repeat has a gap or audio break: Test the chosen input-looping behavior and timestamps with the actual file. If the transition is not acceptable, adjust the file or workflow rather than assuming that a loop option makes the end and beginning seamless.
- YouTube does not receive the stream: Confirm that the current server URL and matching stream key were entered correctly, the live stream is ready in Live Control Room, and the encoder is using the intended RTMPS endpoint. Keep the key private.
YouTube Live, archives, and content rights
YouTube’s encoder workflow says stopping the encoder ends the outgoing stream. Streams under 12 hours are automatically archived according to its encoder instructions. If the source video is copyrighted or includes music, footage, or other material you do not have permission to use, rotation and live encoding do not grant those rights. Check that you have the necessary rights and follow YouTube’s applicable live-streaming and content policies before broadcasting.
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