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Use FFmpeg’s xfade filter inside -filter_complex, then encode the filtered video and send it to YouTube Live. Set duration for the blend length and offset for when it begins. The example below makes a two-second video fade; audio needs its own mapping or crossfade.
Crossfade two videos with FFmpeg
Replace the destination with the RTMPS ingest address and stream key shown in YouTube Live Control Room. This example assumes the video inputs are compatible and uses optional audio from the first file only—it does not blend the two files’ audio.
ffmpeg -re -i first.mp4 -re -i second.mp4
-filter_complex "[0:v][1:v]xfade=transition=fade:duration=2:offset=8[v]"
-map "[v]" -map 0:a?
-c:v libx264 -c:a aac -f flv
"rtmps://YOUR_YOUTUBE_INGEST/YOUR_STREAM_KEY"FFmpeg’s filter documentation describes xfade as a video-stream transition filter with configurable transition type, duration and offset. Complex graphs with multiple inputs are configured with -filter_complex; labeled outputs such as [v] must be mapped, as explained in the FFmpeg command-line documentation.
Understand the timing and labels
[0:v]and[1:v]select the first video stream from the first and second inputs.transition=fadechooses the fade effect.duration=2makes the transition last two seconds.offset=8starts it at timestamp 8 on the first input’s timeline.[v]names the filter output, and-map "[v]"sends that output to the encoder.
The sample uses -re on both inputs to read them at their native rate for live output. It is illustrative, not a file-specific tested command: actual timing and compatibility depend on the clips, their streams and your installed FFmpeg build.
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Chain more than two clips
For additional clips, connect transitions in sequence with further xfade filters. Calculate each later offset on the timeline of the already-combined output, accounting for the overlap created by earlier transitions. Do not treat a later clip’s original start time as its transition offset; the correct values depend on clip durations and the transition lengths you choose.
Choose what happens to the audio
xfade blends video only. Decide separately whether the broadcast should use clip audio, a blended transition between clip audio, or a continuous music or narration track.
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Blend audio from both clips
Use the separate acrossfade audio filter and map its labeled output. FFmpeg documents acrossfade as a filter that crossfades one audio input stream into another with a configurable duration. The exact graph and mapping depend on which audio streams exist in your files.
Keep one continuous audio source
Map the intended music, narration or other continuous audio stream instead of relying on the example’s -map 0:a?. The question mark makes input 0’s audio mapping optional: if that file has no audio, the command can still proceed, but it will not create the audio track your program may need. Select and map an actual audio source when the broadcast requires sound.
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Make the inputs compatible when xfade fails
If FFmpeg reports mismatched parameters or cannot initialize xfade, inspect the filter help for your installed build and compare the decoded video streams. They may need consistent frame rate, time base, dimensions and pixel format before the transition can be applied. There is no single normalization chain established for every pair of files, so choose conversions based on the actual inputs rather than pasting in a universal recipe.
- Filter initialization or parameter mismatch: check both streams’ properties and normalize the incompatible properties before
xfade. - No audio in the output: check whether the mapped input has an audio stream and whether the selected mapping matches the intended program audio.
- Transition appears at the wrong time: recalculate the offset against the active combined timeline, including earlier overlaps.
Because xfade operates on decoded frames, FFmpeg must encode the resulting video. Do not use -c:v copy for this workflow: stream copy bypasses the frame processing needed to create a crossfade. FFmpeg’s documentation explains that filtering is a reason to transcode and that streams are transcoded by default unless copying is requested.
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Set YouTube Live output and test it
Use the ingest address and stream key from YouTube Live Control Room, and prefer RTMPS for live ingest. YouTube’s current encoder settings guidance lists H.264, H.265 and AV1 video for RTMP/RTMPS; AAC or MP3 audio; CBR bitrate encoding; and a recommended two-second keyframe interval that should not exceed four seconds. Choose a supported combination your encoder and upload connection can sustain.
As a specific example—not a universal requirement—YouTube lists 1080p at 30 fps using H.264 as 5 Mbps minimum and 14 Mbps recommended in its bitrate guidance. The published recommendations vary by resolution, frame rate and ingest codec; consult the table for the combination you intend to send rather than applying this one figure to every stream.
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- In YouTube Live Control Room, create or open the planned live stream and copy its ingest address and stream key into the FFmpeg destination.
- Choose a supported codec, CBR bitrate, resolution and frame rate appropriate to the stream and the connection’s available upload bandwidth.
- Before the event, test the stream with audio and video movement similar to the planned broadcast.
- During the event, monitor YouTube’s stream health and respond if it reports delivery or encoding problems.
YouTube recommends testing before going live and monitoring stream health during the event. A setting in its recommendation table does not guarantee that a particular machine or network can sustain it.
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