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If your YouTube live stream freezes just as FFmpeg moves to a playlist video with different dimensions, treat the transition as a clue—not proof of a single YouTube bug. First check whether FFmpeg is copying video instead of scaling and encoding it, then compare stream properties and timestamps at the boundary and check YouTube’s stream-health messages. A test output with consistent dimensions and frame rate is a useful way to isolate the problem.
Why a resolution change can coincide with a freeze
A change in input dimensions can expose a mismatch in the outgoing stream, especially if FFmpeg is stream-copying packets. Stream copy does not decode, filter, or encode the video; it therefore cannot apply scaling to make differently sized inputs uniform. FFmpeg documents output sizing through the scale filter, and its -s option inserts that filter at the end of the filtergraph. See the FFmpeg documentation.
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That makes a transition-related output change worth investigating, but it does not establish that YouTube caused the freeze or that resolution alone is the root cause. Discontinuous timestamps, malformed media, connection interruption, encoder overload, or changes to audio/video streams are other possibilities to consider if a fixed-size output does not help.
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Diagnose the transition step by step
- Identify the ingest protocol. Check whether the stream is sent to YouTube over RTMP/RTMPS or HLS. The protocols have different requirements; do not apply HLS segment rules to an RTMP stream. YouTube’s ingestion protocol documentation describes the supported options.
- Save the command and full log. Note the FFmpeg version/build and preserve the output around the freeze. At the playlist boundary, compare input and output dimensions, codec and profile, pixel format, frame rate, timestamps, and any decoder, filter, encoder, or muxer warnings. Also record the freeze timestamp.
- Check for stream copy. Look for
-c:v copyor an equivalent video-copy setting. If dimensions vary, test a decode/filter/encode path with an explicit scale filter and a single chosen output size and pixel format. For example, after choosing an appropriate target size and format for your content, apply them consistently to every input in the output filter chain. The exact filtergraph depends on your command and playlist workflow; do not assume a generic command can safely replace it. - Keep the outgoing stream properties steady. For a diagnostic test, use consistent output dimensions, frame rate, codec configuration, audio stream layout and sample rate, and GOP/keyframe cadence across playlist transitions. This is a troubleshooting recommendation based on YouTube’s published ingest settings, not a claim that YouTube rejects every midstream change.
- Check YouTube’s stream configuration. In Live Control Room, review the stream key’s resolution and frame-rate setting. YouTube Help recommends automatic detection by default: “By default (recommended), YouTube will automatically detect your resolution and frame rate.” If you choose manual settings, ensure they match the stream FFmpeg actually sends. The Live Streaming API documentation says automatic detection uses
variablefor both resolution and frame rate; the two settings must be configured together. - Compare both sides of the event. Match FFmpeg’s log at the freeze timestamp against Live Control Room’s stream-health status and messages. The API also exposes stream status values such as active, error, inactive, and ready, which can help distinguish a process that is running from a stream YouTube is receiving and accepting.
- Reproduce before the real broadcast. Test with representative audio and moving video, including the same sort of resolution transition. YouTube recommends testing with representative sound and movement. If a fixed-size re-encode with matching ingest settings still freezes, use the logs to investigate timestamp continuity, media integrity, connection stability, encoder load, and audio/video changes.
Choose the right output settings for the ingest protocol
RTMP or RTMPS
YouTube’s encoder settings guidance lists H.264, H.265, and AV1 for RTMP/RTMPS ingest, up to 60 fps, constant bitrate (CBR), and a recommended keyframe interval of two seconds, not exceeding four seconds. Select the bitrate for the actual codec, resolution, and frame rate rather than copying a number from a different mode. For example, YouTube lists H.264 recommendations of 10 Mbps for 1080p30 and 12 Mbps for 1080p60; other combinations have different recommendations. Check its current table for the mode you send.
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For a resolution-transition diagnosis, first keep the output dimensions and frame rate constant; then check that bitrate mode and keyframe cadence also match the platform’s guidance. Avoid changing several variables at once, or it will be harder to tell which change affected the freeze.
HLS
If you are using HLS ingest, YouTube’s HLS ingestion guidance calls for TS segments 1–4 seconds long, a rolling playlist with no more than five outstanding segments, HTTPS POST/PUT requests, and no byte ranges. HLS has higher latency than RTMP because it sends segments rather than one continuous stream. These segment requirements do not apply to RTMP/RTMPS.
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What to capture if the freeze persists
- The complete FFmpeg command, version/build, and log covering the transition.
- Stream metadata for the playlist files, including dimensions, codecs, pixel formats, frame rates, audio layout, and sample rates.
- The ingest protocol and the stream key’s automatic or manual resolution/frame-rate configuration.
- The exact freeze time and corresponding Live Control Room stream-health messages.
- Whether the issue reproduces when every playlist item is filtered and encoded to one stable output format.
Without those details, the resolution change remains a plausible trigger to test, not a confirmed cause.
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