You can rotate a prerecorded video before it reaches YouTube Live by decoding and processing it with FFmpeg on a Raspberry Pi, then sending the encoded output to YouTube over RTMPS. If you want the video to repeat, configure looping separately from the rotation filter. The exact command depends on your Pi model, operating system, FFmpeg build, source file, and target format; the settings below are a workflow guide, not a tested command for every setup.
What you need before you start
- A Raspberry Pi with boot media and a power supply suited to its specific model. Raspberry Pi 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 OS, not a video archive; allow additional storage if your videos will live on the Pi. See the Raspberry Pi getting-started guide.
- A source video stored on the Pi or accessible to it, plus enough free storage for your operating system and media.
- FFmpeg installed with the input and output codecs and filters your workflow needs. Availability depends on the package and build; check the installed FFmpeg documentation and capabilities.
- A stable internet connection with enough upload capacity for the chosen output bitrate.
- A YouTube channel able to create a live stream, and its current server URL and stream key from Live Control Room.
For a headless Pi, Raspberry Pi OS Lite is an option; set up SSH or Raspberry Pi Connect for remote access. Use Ethernet or Wi-Fi according to your network and location. The Pi setup guide covers boot media, power, and networking.
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Choose the output orientation and settings
Check the source before applying a rotation
First inspect the video in a player and determine whether its picture is already upright or relies on display-rotation metadata. Decide whether you want a portrait or landscape stream. Rotation changes the picture’s orientation; it does not automatically decide whether the result should fill a target canvas, be cropped, or show borders. Choose that behavior deliberately and check the frame after processing.
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FFmpeg documents transpose-related video filters in its filter reference. A filter operates on decoded video, so applying rotation generally requires video processing and re-encoding; do not assume stream copy will preserve an arbitrary rotation operation.
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Set a realistic resolution, frame rate, and bitrate
YouTube’s encoder guidance supports H.264, H.265/HEVC, and AV1 ingestion, up to 60 fps, with CBR video and AAC or MP3 audio. For H.264, YouTube’s published 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 evidence that a particular Raspberry Pi can encode a rotated video at that resolution or frame rate. Your actual output also depends on the source, filter chain, encoder support in the Pi’s FFmpeg build, thermal conditions, and available upload bandwidth. Choose a bitrate your connection can sustain reliably, with headroom for normal network variation. YouTube transcodes the incoming live feed for viewers, so your encoder sends one selected output rather than making a separate rendition for every viewer. Review the current YouTube encoder settings and bitrate recommendations before going live.
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Set the keyframe interval
YouTube recommends a two-second keyframe interval and says not to exceed four seconds. Match the encoder’s keyframe setting to the output frame rate so the interval is actually expressed in seconds. Confirm the setting supported by your chosen encoder rather than copying an option from a command intended for a different FFmpeg build.
Rotate, loop, and send the video
- Prepare the Pi. Install Raspberry Pi OS on suitable boot media, use a model-compatible power supply, connect the Pi to the network, and install or verify an FFmpeg build with the required filters and encoder. Record the Pi model, OS version, FFmpeg version/build, and relevant codec support so you can diagnose limitations.
- Inspect the source file. Check its orientation, dimensions, frame rate, video and audio codecs, and whether it already carries rotation metadata. Play a representative section with movement and audio. Decide the final orientation and whether to fit, crop, or letterbox it to the chosen output canvas.
- Build and test the filter chain. Use the appropriate FFmpeg transpose filter for the direction of rotation, adding scaling or padding only if your chosen output requires it. Preview or create a short test output and confirm that the picture is upright and framed correctly. Rotation requires processing the video, so select an encoder that is actually available in your FFmpeg build.
- Configure looping separately. Set the file input’s loop behavior if the video should repeat. Test the transition at the end of the file: look for a blank gap, abrupt audio discontinuity, or timestamp problem. Looping behavior and command syntax vary by FFmpeg build and workflow; do not assume a setting guarantees seamless playback.
- Choose encoder output settings. Configure the selected codec, resolution, frame rate, CBR video bitrate, audio codec, and two-second keyframe interval in accordance with YouTube’s current recommendations and what the Pi can sustain. Verify encoder performance with the rotation filter active; a bitrate recommendation alone does not establish that the board can keep up.
- Get the current YouTube connection details. In YouTube Live Control Room, create or select the live stream and copy its current server URL and stream key into the encoder. Prefer RTMPS. Do not publish the key, include it in screenshots, or share it in logs or support requests. YouTube’s encoder setup instructions explain the current workflow; its developer guide covers RTMPS ingestion, including port 443.
- Run a private or otherwise suitable test first. Use audio and motion similar to the planned broadcast. Watch YouTube’s stream health and status messages while the Pi encodes and uploads. Confirm picture orientation, audio, loop transition, stability, and network capacity before relying on the setup for a scheduled stream.
- Start the intended broadcast and monitor it. Keep the Pi powered, connected, and cool enough to operate under the workload. Stopping the encoder ends the outgoing stream. YouTube says streams under 12 hours are automatically archived; check its current encoder guidance for details.
The exact FFmpeg command is intentionally not presented as universal: the right syntax and encoder flags depend on the Pi, OS, FFmpeg build, input, filter chain, and output. A command copied without checking those details may fail, select an unavailable encoder, produce the wrong orientation, or overload the board.
Check YouTube’s live-stream and content requirements
Before broadcasting, review the current rules in YouTube Live Control Room and YouTube’s encoder guidance. Make sure you have the rights needed for every video and audio track you stream; prerecorded material is not exempt from copyright rules. A continuous prerecorded stream should also comply with YouTube’s monetization and reused-content policies if you intend to monetize it. Do not treat a successful encoder connection as confirmation that a video is eligible for monetization or cleared for use.
Troubleshooting common problems
- The picture is sideways, upside down, or rotated twice: Check both the actual pixel orientation and any display-rotation metadata. Adjust the filter direction or remove an unnecessary rotation, then preview the processed output before reconnecting.
- The picture is cropped or has unexpected borders: Rotation can change the frame’s width and height. Revisit the target canvas and the fit, crop, or padding behavior in the filter chain.
- The Pi cannot maintain the selected output: Rotation and re-encoding add work. Verify the encoder is available in the installed FFmpeg build, inspect CPU or hardware-encoder use and temperatures, then test a lower resolution or frame rate. YouTube’s bitrate table is not a Pi performance benchmark.
- YouTube reports unstable stream health: Compare the selected bitrate with measured, stable upload capacity and check the network connection. Test using representative audio and motion, then inspect YouTube’s status messages.
- YouTube does not receive the stream: Re-copy the current server URL and key from Live Control Room, confirm that the stream is active and the encoder is using RTMPS correctly, and keep the key private. Avoid stale endpoints from old tutorials.
- The video pauses or audio jumps when it repeats: Test the loop boundary and timestamps with the actual file. The selected looping method may introduce a gap or discontinuity; try a different loop workflow and check the transition before the live broadcast.
- The Pi disconnects or stops during a long run: Check power, network stability, cooling, and available storage, then repeat a full-duration test appropriate to your planned broadcast. A short successful test does not prove long-run stability.
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