The Tool Desk
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What you need before you start
- FFmpeg installed on a computer that can stay on and connected to the internet for the duration of the stream.
- Your video files and a text playlist file in a known directory.
- A YouTube channel with live streaming enabled, plus the stream URL and stream key from Live Control Room.
- An upload connection that can sustain the output bitrate you choose.
This is a command-line workflow for prerecorded video, not a camera broadcast. FFmpeg reads the files on your computer, so the computer and its network connection must remain available while it streams.
Create the YouTube stream and protect its key
- In YouTube Studio, open Go Live and create or schedule an encoder stream. Choose the visibility—public, private, or unlisted—that suits your purpose. See YouTube’s encoder setup instructions and live stream settings.
- In Live Control Room, copy the stream URL and stream key. You will combine them as the destination in FFmpeg’s command.
- Treat the key like a password: do not publish it in a script, screenshot, or source-control repository. If it is exposed, reset it in YouTube Studio and update FFmpeg with the replacement.
Prepare a compatible playlist
Place the playlist file alongside your media where practical. Save a file named playlist.txt in this format, using filenames that match your own files:
ffconcat version 1.0
file 'video-01.mp4'
file 'video-02.mp4'
file 'video-03.mp4'The concat demuxer reads entries in order and adjusts timestamps. FFmpeg’s documentation cautions: “All files must have the same streams (same codecs, same time base, etc.).” See the FFmpeg documentation on concat and FFmpeg formats. In practice, matching codecs, stream layouts, frame dimensions, frame rates, audio layout, and reliable durations reduces the risk of gaps, artifacts, or abrupt transitions at clip boundaries.
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If clips do not match, transcode them to a consistent format before adding them. Files with inaccurate durations or mismatched audio and video lengths can cause timestamp discontinuities when the next segment begins. Use simple relative paths where possible; FFmpeg’s safe mode rejects some paths by default. The example below uses -safe 0 to allow paths in a playlist you control. Quote or escape filenames with spaces or special characters, and never use an untrusted playlist with that setting.
Run FFmpeg as a real-time YouTube encoder
Use this as a starting template, not a universal preset. Change the bitrate and frame rate to suit the media, encoder capacity, connection, and YouTube’s current guidance:
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ffmpeg -re -stream_loop -1 -f concat -safe 0 -i playlist.txt
-c:v libx264 -preset veryfast -pix_fmt yuv420p -r 30 -g 60
-b:v 4500k -maxrate 4500k -bufsize 9000k
-c:a aac -b:a 128k -ar 44100
-f flv "<RTMPS_URL>/<STREAM_KEY>"Replace <RTMPS_URL>/<STREAM_KEY> with the exact RTMPS ingest URL and stream key shown in Live Control Room; do not include the angle-bracket placeholders. FFmpeg options apply to the next input or output, so input options belong before -i and output encoding options after it.
-rereads file input at real-time speed for live use;-stream_loop -1requests indefinite looping.-f concatselects the concat demuxer, and-safe 0permits the controlled playlist paths.-c:v libx264and-c:a aacencode video and audio;-pix_fmt yuv420pis a common compatibility choice.-preset veryfasttrades some compression efficiency for lower encoding workload.-r 30requests 30 output frames per second. At that frame rate,-g 60sets a nominal 60-frame, two-second GOP (keyframe interval).-b:vsets target video bitrate,-maxrateits maximum rate, and-bufsizethe rate-control buffer.-b:a 128ksets audio bitrate and-ar 44100sets audio sample rate.-f flvselects the output container commonly used with RTMP-style ingest. YouTube recommends encrypted RTMPS; see YouTube’s RTMPS guidance.
Do not copy 4500 kb/s blindly. YouTube’s recommended bitrate depends on codec, resolution, and frame rate; check its current encoder settings and bitrate table for your chosen output. The connection must sustain the selected rate. YouTube recommends a two-second keyframe interval and says not to exceed four seconds; at 30 fps, the example’s -g 60 corresponds to two seconds. The command is an illustrative configuration assembled from documented options, not a tested command or a guarantee for every FFmpeg build, media file, or endpoint.
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Test the stream and verify the loop
- Start with a private or unlisted test stream.
- Watch the Live Control Room preview and confirm that video and sound are present and the stream health is acceptable.
- Use representative movement and audio, and let the test run across at least one playlist boundary. Check for silence, black frames, timing jumps, or other discontinuities between clips.
- If a boundary fails, normalize the files to matching codecs, time bases, frame size, frame rate, audio layout, and dependable durations, then test again.
YouTube recommends testing and monitoring stream health; the encoder settings guidance explains its recommendations. A looping FFmpeg process does not itself monitor every failure mode or ensure uninterrupted operation.
Know what happens to long broadcasts
YouTube says streams shorter than 12 hours are automatically archived. That does not promise a single automatically archived replay for a 24/7 stream. If you need a replay, plan how you will record or preserve the source separately and check the archive behavior in your own channel’s Live Control Room. See YouTube’s encoder live-stream guidance.
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Common problems and fixes
- YouTube does not receive the stream: Check that the destination uses the exact ingest URL and current key from Live Control Room, and that the key has not been reset. If exposed, reset it and replace it in the command.
- Playback is too fast or too slow: Confirm that
-reappears before the playlist input. It paces file reading for real-time output. - The stream stops at the end of the list: Confirm that
-stream_loop -1is present before-i playlist.txtand that FFmpeg has not exited with an input or encoding error. - Files fail to open: Run the command from the directory containing the playlist or use correct paths. Check spelling, quoting, and whether safe mode rejects a path; only use
-safe 0with a playlist and files you control. - Audio, video, or timing breaks at a clip boundary: Check that files have matching stream layouts, codecs, time bases, and accurate durations. Transcode mismatched clips to a consistent format, then retest.
- Stream health is poor or frames drop: Compare the configured bitrate with YouTube’s current recommendations for the selected resolution, frame rate, and codec, and verify the upload connection can sustain it. If the encoder cannot keep up, reduce output demands or choose a faster preset.
- The machine or network goes offline: FFmpeg on a local computer cannot continue sending when that computer or connection is unavailable. Restore the host and connection, then restart and verify the feed in Live Control Room.
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