To loop a local MP4 to YouTube Live from Windows, use FFmpeg with -stream_loop -1 and -re before the input file, then send the encoded output to the RTMPS address and stream key for your YouTube stream. The command below is an illustrative starting point for a 30-fps source, not a universal preset; you need to adapt its path, destination, frame-rate-dependent keyframe settings and bitrate.
The loop runs while FFmpeg is running, but it does not take care of checking the preview, starting a scheduled broadcast in YouTube Studio, or responding to warnings. Test the feed before making it public and keep the stream key private.
What to have ready
You need FFmpeg available in Windows Command Prompt, a local MP4 that you are permitted to broadcast, and a YouTube Live stream whose RTMPS URL and stream key you can access in YouTube Studio. You also need an upload connection that can sustain the outgoing feed. There is no single bitrate suitable for every file or connection, so treat the values below as examples to assess rather than settings to copy without checking.
FFmpeg is a command-line tool. If you have not used it before, first confirm that it runs: open Command Prompt and enter ffmpeg -version. If Windows reports that the command is not recognised, FFmpeg may not be installed or its executable may not be on your PATH. Use a trusted distribution and follow its installation instructions; alternatively, run ffmpeg.exe from its own folder or provide the full path to the executable in the command. YouTube does not specify a particular Windows computer requirement in the encoder guidance cited here.
The command uses libx264 for H.264 video and AAC for audio. The FFmpeg build you use needs those encoders available. To inspect build configuration, run ffmpeg -encoders and look for libx264 and aac. If libx264 is absent, the command as written will fail, and you need a build with that encoder or a different supported encoding approach. YouTube lists several accepted video and audio codecs, but an accepted codec does not mean every local FFmpeg build includes it. Check YouTube's encoder settings and format guidance for current requirements and recommendations.
Also check the source itself before starting: does it have the picture and sound you intend to send, and is its frame rate known? A simple inspection command is ffmpeg -i "C:\path\video.mp4". FFmpeg prints stream information and may finish with an error because no output was requested; that does not necessarily mean the file cannot be read. You can use a media-information tool if you prefer a graphical view. The crucial detail for this command is the video frame rate, because the example's keyframe interval assumes 30 fps.
Get the stream's RTMPS address and key
In YouTube Studio, open Create, choose Go Live, then create or select the stream in Live Control Room. The exact interface can change, so follow the current YouTube setup flow if those labels differ. YouTube's encoder setup instructions describe entering the server URL and stream key in encoder settings.
The destination in FFmpeg combines the ingest URL and key in a format YouTube provides. The example later shows placeholders rather than a usable address: replace them with the values shown for the stream you selected. Do not paste a key from one stream into a command aimed at another stream, and do not assume a generic address from an old tutorial is still appropriate. Use the address and key displayed in the current stream settings.
Treat the key like a password for sending a feed to your channel. Do not include it in a screenshot, public post, shared document, or support request that others can see. If it is exposed, use Live Control Room's controls to reset it, then update the command with the replacement key. YouTube's live stream settings help explains managing keys; after a reset, the old command will no longer send to the new key.
RTMPS is the encrypted transport option YouTube recommends. Keep the full protocol prefix provided by YouTube (rtmps:// if that is what the settings show) when you assemble the destination. Avoid leaving a literal placeholder such as YOUR_STREAM_KEY in the final command: FFmpeg may attempt a connection, but it will not reach the intended stream.
Set the MP4 path correctly
In Windows Command Prompt, the input path goes between double quotation marks. This matters when a folder or file name contains spaces, as in "C:\Users\Asha\Videos\morning bhajans.mp4". Replace the example path with the actual location of the file on the computer running FFmpeg. The backslashes are normal Windows path separators; keep the quotation marks around the whole path.
You can reduce typing errors by opening File Explorer, locating the MP4, and using its Properties dialog to check its location and name. Be sure the extension and spelling match. A file can appear in a video player while still being inaccessible to FFmpeg if the command points to a different folder, an external drive that is disconnected, or a cloud-synced file that has not been downloaded locally.
The file needs to remain available for the duration of the broadcast. Do not move, rename, or delete it while FFmpeg is reading it. If you use a removable drive, a loose cable or sleep setting can interrupt access. Copying the file to a stable local folder before the stream is a practical way to avoid one avoidable source of failure. YouTube's live streaming troubleshooting guidance is useful when the incoming feed or stream health does not look as expected.
A single-file loop is also different from a playlist. When the MP4 reaches its end, FFmpeg starts that same input again; it does not choose another video, remove pauses, or vary the sequence. If your goal is to rotate a group of files rather than repeat one item, consider how a playlist behaves and how repeated items can be avoided; the discussion of preventing a cloud stream from repeating the same playlist item addresses that distinct problem.
Put the input options before -i
The two options that make this command a real-time loop are -re and -stream_loop -1. Put both before the relevant -i, which introduces the input file. FFmpeg options apply to the next input or output, so position is not merely a formatting preference: these options describe how FFmpeg reads this file.
-stream_loop -1 tells FFmpeg to loop the input indefinitely. The -1 means an unlimited number of repeats. If the option is placed after -i, it will not serve as the input-loop instruction for the file already opened. If the file plays once and the process exits, check the option's spelling and position first. FFmpeg documents this behaviour in its command-line reference.
-re reads the file at its native frame rate, rather than allowing FFmpeg to process it as quickly as the computer can. For a file-based live feed, that pacing helps avoid sending the content as a burst. It is an input option too, so it belongs before -i. This example is for a stored MP4, not a camera or other already-live input. FFmpeg cautions against using real-time input pacing in cases where the source is already a live capture.
The option order before -i can be written as ffmpeg -re -stream_loop -1 -i "C:\path\video.mp4". After the input, the remaining options describe the output encoding and destination. That distinction is useful when troubleshooting: if a path is wrong, look at the input; if the feed reaches YouTube but has unsuitable picture, sound, or pacing, inspect the output choices and stream health.
Windows Command Prompt example
This is a one-line Windows Command Prompt template for a 30-fps MP4. Replace the path and destination placeholders before running it. The encoding and bitrate values are illustrative, not universal, and are not a guarantee of compatibility, picture quality, or uninterrupted streaming.
ffmpeg -re -stream_loop -1 -i "C:\path\video.mp4" -c:v libx264 -preset veryfast -b:v 4500k -maxrate 4500k -bufsize 9000k -g 60 -keyint_min 60 -sc_threshold 0 -c:a aac -b:a 128k -ar 44100 -f flv "rtmps://YOUR_INGEST_URL/YOUR_STREAM_KEY"
The options after -i select video encoding with H.264 via libx264, set a preset, specify bitrate-related values, and configure keyframe behaviour. The audio options encode to AAC, set an audio bitrate, and specify a sample rate. -f flv selects the output format used in this common FFmpeg-to-YouTube encoder pattern. The final quoted string is the destination, not a local output filename. The command sends a feed; it does not create a local recording.
The example sets -g 60 and -keyint_min 60. At 30 frames per second, 60 frames correspond to two seconds. YouTube recommends keyframes every two seconds and no more than four seconds apart, but the example only corresponds to two seconds when the source/output cadence is 30 fps. If your source is 25 fps, for example, 60 frames would take longer than two seconds. Set GOP and keyframe cadence for the actual frame rate and any output frame-rate changes you make; do not treat 60 as a universal value.
YouTube's encoder recommendations also discuss constant bitrate and suitable bitrate ranges. The example's bitrate flags are a starting illustration, not proof that a connection can sustain the stream or that the result will suit a particular resolution or motion level. YouTube lists 5 Mbps as a minimum and 14 Mbps as recommended for 1080p/30 H.264 in its guidance accessed on 3 October 2026. Those are YouTube's published configuration recommendations, not independent measurements; consult the current table and match your choices to the source and stable upload capacity.
Adapt the settings without guessing
Start by matching the command to the file and the connection. If you know the source is 30 fps and want to keep the example's frame cadence, the two GOP values shown correspond to YouTube's two-second recommendation. For a different frame rate, choose a keyframe interval that represents the intended time interval at that rate. If you change the output frame rate, base the calculation on the output cadence instead. Confirm the resulting feed in YouTube's preview rather than relying on arithmetic alone.
Next consider resolution and bitrate together. A higher-resolution or more detailed moving picture needs more data than a low-resolution, mostly static image, but the sustainable upload rate is also a constraint. Leave headroom for normal variation in the connection instead of allocating all available upload capacity to the feed. YouTube's bitrate table should guide a suitable range for the chosen resolution, frame rate and codec. The separate guide to YouTube Live bitrate recommendations for H.264 and 1080p/60 fps covers a different frame-rate case; do not transplant its values into this 30-fps example without checking the details.
The command uses a veryfast x264 preset. A faster preset generally asks less of the computer at the expense of compression efficiency; a slower one can demand more processing. It is not a universal setting or a guarantee that an older computer will encode successfully. If CPU use is consistently high or FFmpeg reports encoding trouble, test a less demanding choice, or consider reducing output resolution or bitrate. Do not assume that a specific preset is required by YouTube.
Audio depends on the MP4. The template asks FFmpeg to encode an audio stream as AAC, but it cannot create meaningful programme audio if the file has no audio track. If the source is silent by design, check how YouTube reports the feed; if audio is expected but absent, inspect the input stream list and FFmpeg output for audio-related errors. A microphone connected to the computer is not automatically mixed into this command.
YouTube recommends constant bitrate and testing before broadcast. The example's -b:v and -maxrate values express a video rate, but command flags alone do not establish that the whole setup will behave as intended. Observe FFmpeg's output, YouTube's preview and stream health. If the upload fluctuates or warnings appear, lower the demand to a level the connection can sustain, then test again. A wired Ethernet connection can be worth trying when Wi-Fi is unreliable, but it is optional and does not guarantee a stable feed.
For a long-running channel, the choice of running FFmpeg on a home PC also means the PC, its network connection and the command session need to remain available. If overnight interruptions caused by a local computer being switched off are the specific problem, StreamNeo removes that particular need to keep your own computer running by taking an uploaded video and broadcasting it to YouTube from the cloud. It does not change the need to prepare the content, use the correct channel settings, and check YouTube's current rules and stream status.
Start, preview and stop deliberately
When you run the command, keep the Command Prompt window open. FFmpeg's log should show that it opened the input, is encoding, and is sending output. If the window closes or FFmpeg exits, the feed stops. Do not assume that seeing a successful start in the terminal means YouTube has accepted the stream or that viewers can see it.
For a scheduled stream, wait for the incoming preview in Live Control Room, confirm the picture and audio, and use the Go live control when you are ready. YouTube's setup instructions distinguish the encoder feed from the act of starting the public broadcast for a scheduled stream. For a stream that is already configured to begin immediately, follow the controls and status YouTube presents for that stream. Check the preview with representative motion and sound rather than a static frame alone.
Watch stream health and any warnings while the broadcast is running. If the feed is flagged or rejected, verify that the URL and key belong to the selected stream, that the destination includes the right protocol and that the codecs, bitrate and keyframe cadence fit YouTube's current guidance. If there is no sound, verify that the MP4 contains audio and that FFmpeg can encode it. If playback races ahead, verify -re remains before -i. These checks isolate common causes without implying a single command works on every Windows installation.
To stop, interrupt FFmpeg in Command Prompt, then use End Stream in Live Control Room when applicable. YouTube states that streams shorter than 12 hours are automatically archived; do not assume the same archive result for longer broadcasts. If you need a recording independent of YouTube's archive, plan and test a separate recording workflow before relying on it.
This manual setup is most useful when you want direct control over a single file and are comfortable leaving the computer and process running. If the content is a service or devotional programme that should run without someone tending a PC, consider the operational burden as well as the command itself; the article on 24/7 church streaming without a tech team discusses that broader workflow. The right approach depends on whether direct software control or avoiding local-computer duty matters more to you.
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FAQ
Does -stream_loop -1 really repeat the MP4 forever?
It tells FFmpeg to repeat that input indefinitely while the process continues. It does not keep the computer awake, reconnect a failed network, or restart FFmpeg after it exits. Keep the option before the input's -i and monitor the feed.
Why must -re and -stream_loop come before -i?
They control how FFmpeg reads the next input, so they need to appear before the input they apply to. In this template, that is the MP4 path. Moving them after -i changes what the options apply to and can prevent the file from being paced or looped as intended.
Can I use the example unchanged for a 25-fps or 60-fps file?
No. The sample is framed around a 30-fps source, and its 60-frame GOP corresponds to two seconds only at that cadence. Adapt the keyframe interval to the actual frame rate and review YouTube's current bitrate guidance for the resolution and codec you choose.
What if YouTube shows no preview or reports a warning?
Check that FFmpeg is still running, the input path is correct, and the RTMPS URL and key belong to the selected stream. Then inspect codec, bitrate, keyframe and audio settings, and use Live Control Room's stream-health information. Test again before a public broadcast rather than assuming that a command completing its setup guarantees acceptance.