To loop prerecorded product demos as one continuous YouTube Live broadcast with FFmpeg, put compatible files in a concat-demuxer playlist, read that playlist in real time with -re, loop it with -stream_loop -1, and send the encoded output to the RTMPS ingest URL and stream key shown in YouTube Live Control Room. The command below is a starting point—not a universal preset. The computer running FFmpeg and its internet connection must remain available for the stream to continue.
1. Prepare a compatible demo playlist
Create a plain-text manifest named playlist.txt in the directory where you plan to run FFmpeg:
file 'demo-01.mp4'
file 'demo-02.mp4'
file 'demo-03.mp4'FFmpeg’s concat demuxer reads the listed files sequentially. It expects the files to have matching streams, codecs, and time bases. If one demo has a different codec, stream layout, or timing, normalize the files to a consistent format before relying on the playlist. Timestamp adjustments use each file’s duration, so incorrect duration metadata can cause gaps or artifacts. See the FFmpeg concat demuxer documentation.
For paths with spaces or special characters, use valid concat-demuxer quoting and test the manifest locally. The example command uses -safe 0 to permit paths that do not meet the demuxer’s default safety rules. Use that option only for a playlist you control; do not treat a manifest that references untrusted paths as safe.
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2. Send the looping playlist to YouTube Live
In YouTube Live Control Room, create or open the stream and copy its ingest server URL and stream key. Replace the placeholder output address in this command with the RTMPS URL and key YouTube provides:
ffmpeg -re -stream_loop -1 -f concat -safe 0 -i playlist.txt
-c:v libx264 -preset veryfast -pix_fmt yuv420p
-b:v 14M -maxrate 14M -bufsize 28M -g 60
-c:a aac -b:a 128k -ar 44100
-f flv 'rtmps://YOUTUBE_INGEST_URL/YOUR_STREAM_KEY'The input options -re and -stream_loop -1 belong before -i. FFmpeg documents -re as reading input at its native rate and -1 as infinite looping; see the FFmpeg command-line documentation. The output container and protocol in this example are for RTMP/RTMPS. Use the ingest URL and key supplied for your YouTube stream, not the placeholder.
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The example’s video settings illustrate an H.264 1080p30 starting point, not a tested universal preset. The 14 Mbps bitrate matches YouTube’s rolling guidance for H.264 at 1080p30; that guidance page was accessed October 3, 2026 and does not display a publication year. For 720p30, YouTube recommends 8 Mbps. Match output resolution and frame rate to the source and your encoding and upload capacity rather than copying those values blindly. The -g 60 GOP corresponds to two seconds at 30 fps; change it if the output frame rate changes. YouTube recommends a two-second keyframe interval and says not to exceed four seconds. Its current guidance lists H.264, H.265 (HEVC), and AV1 video, AAC or MP3 audio, CBR encoding, and frame rates up to 60 fps. Consult YouTube’s encoder settings guidance for the current requirements and recommendations.
Keep the stream key private
A stream key grants access to send content to your live stream. Treat it like a password: do not publish it, commit it to a public repository, or share a command containing the real key. YouTube documents resetting a compromised key through Live Control Room; see YouTube’s encoder setup guidance.
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3. Test the stream and monitor YouTube’s preview
- Start with representative demos, including the most demanding motion and audio in the playlist.
- Run FFmpeg and open the stream preview in YouTube Live Control Room. Check that picture and sound arrive as expected, and review stream health and warnings.
- Confirm that your actual upload connection has sufficient capacity. YouTube recommends keeping total stream bitrate below available upload capacity and leaving 20% headroom.
- Monitor the live stream while it is running. A process that appears active on your computer does not establish that YouTube is receiving a healthy stream.
YouTube recommends RTMPS as the secure extension to RTMP when available. Its encoder guidance also says to test before starting a live stream. For the protocol and current preflight advice, see YouTube’s encoder settings guidance.
4. Choose RTMP/RTMPS or HLS for the content
RTMP/RTMPS is the straightforward path for a typical SDR demo using supported codecs. HLS is a separate YouTube ingest path that can be useful for HDR or codecs not supported by RTMP. YouTube notes that HLS has higher latency because it sends segments rather than one continuous stream. HLS also requires a matching output setup: TS segments, 1–4 second segment duration, a rolling playlist with no more than five outstanding segments, and HTTPS POST/PUT. An ordinary FLV/RTMP command is not an HLS configuration. See YouTube’s encoder settings guidance.
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5. Plan for long broadcasts and recovery
YouTube says creators can run continuous live streams from an existing content library. Its automatic-archive statement applies to streams under 12 hours; do not assume the same archive behavior for longer broadcasts. Plan separately for keeping the broadcast running and preserving a replay. See YouTube’s live streaming archive guidance.
The playlist and command above do not provide a verified recovery procedure for an FFmpeg crash, network interruption, connection drop, or timestamp fault. Test the complete setup with your FFmpeg build, media, network, and YouTube stream configuration before depending on it unattended. YouTube identifies third-party verified encoders such as AJA HELO Plus as alternatives, but they are not prerequisites for a software FFmpeg setup; consult its encoder setup information.
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6. Troubleshoot common failures
- FFmpeg rejects the playlist or fails at a file boundary: Check manifest paths and quoting, then confirm all files have matching streams, codecs, and time bases. Incorrect duration metadata can produce timestamp gaps or artifacts. Normalize incompatible demos and test the concat input locally.
- YouTube does not receive the stream: Verify that the output URL and stream key are the ones shown in Live Control Room, and that the output uses the selected ingest protocol. Keep the key private; reset it in Live Control Room if it may have been exposed.
- The preview shows poor quality or stream-health warnings: Compare the configured resolution, frame rate, codec, bitrate, and keyframe interval with YouTube’s current guidance. Check actual upload capacity and preserve the recommended 20% headroom.
- The stream starts but does not stay healthy: Check the network and FFmpeg process, then inspect Live Control Room stream health. A running process alone cannot confirm delivery. The command is not an automatic-recovery system, so verify recovery behavior separately before relying on unattended operation.
- An HLS endpoint rejects the output: Do not send the RTMP/FLV command to it. Configure the required HLS segment format, duration, playlist behavior, and HTTPS requests instead.
7. Run a YouTube playlist from the cloud instead
If you want the prerecorded demos to keep looping without leaving a computer and home connection running, StreamNeo is a cloud service for keeping a YouTube channel live from uploaded videos. It is the simpler option when you do not want to operate FFmpeg continuously: upload a recording or build a playlist, add your YouTube stream key once, and go live. StreamNeo loops the uploaded videos from the cloud; it does not stream from a camera.
- Nothing at home has to stay on for the broadcast to continue.
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