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First identify how FFmpeg reads the playlist
Do not assume every playlist is handled the same way. An HLS .m3u8 playlist and FFmpeg’s concat or ffconcat demuxer are different input methods. Inspect the command that starts the stream and note the input format and options used to read the files. FFmpeg’s [concat demuxer documentation](https://www.ffmpeg.org/ffmpeg-all.html) describes the concat demuxer’s behavior and requirements.
Then establish whether the failure is tied to a file boundary. Compare playback and logs before, during, and after the transition that produces the wheel. If the stream fails only as the next file begins, prioritize the incoming file’s compatibility and the preceding file’s duration rather than assuming that YouTube itself is the cause.
Check the files at the failing boundary
FFmpeg documents that the concat demuxer reads files in sequence and adjusts their timestamps, but “All files must have the same streams (same codecs, same time base, etc.).” Compare the two files on either side of the failing transition, including:
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- How many streams each file has and what types they are, such as video and audio.
- The codec used by each corresponding stream.
- The stream time bases.
- Whether the preceding file’s reported duration matches its actual duration.
Different codecs, stream counts, or time bases can violate the concat demuxer’s compatibility requirement. Duration is a separate boundary concern: FFmpeg uses each file’s duration to position the next one, and its documentation warns that an incorrect duration can cause artifacts. In an ffconcat input, a duration directive can override the stored duration when you have a reliable value.
Use your media metadata and FFmpeg logs to make this comparison. There is no single probe command or universal encoding command established for every FFmpeg build and source collection, so choose inspection and conversion options that fit your installed version and files.
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Choose a playlist workflow
Concatenate compatible, normalized files
If you want FFmpeg’s concat demuxer to read the playlist as one input, make the files consistent before concatenating them. When source videos have different formats, sizes, or aspect ratios, a September 22, 2024 FFmpeg-user discussion describes transition trouble and recommends transcoding to common properties. That is a reported case, not a guarantee that normalization alone will fix every stream failure.
Choose common video and audio properties that suit your actual sources and delivery workflow, then verify the resulting files and test the transition. Do not copy a generic conversion command blindly: the correct choices depend on the input media and the FFmpeg version in use. See the [FFmpeg-user discussion](https://ffmpeg.org/pipermail/ffmpeg-user/2024-September/058723.html) for the example involving varied source formats.
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Publish files one by one through SRS
SRS’s archived v4 ingest documentation says SRS does not ingest a file list directly and recommends using a script as the ingest tool to copy files to the RTMP stream one by one. It also documents FFmpeg-based file ingest and RTMP publishing, including use of -re for file ingest. Treat the script as a supported workflow choice, not as a promise of gapless switching: the documentation does not guarantee seamless transitions.
If playlist entries need to change while the stream is running, a script-based sequential workflow may fit better than concatenating a fixed set of inputs. Plan how the script starts and stops each publishing process, handles a failed file, and resumes or advances the playlist. Those operational details depend on your deployment. The cited [SRS v4 ingest documentation](https://ossrs.io/lts/en-us/docs/v4/doc/ingest) is archived; check documentation for the SRS version actually deployed before relying on version-specific behavior.
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Compare the choices against the problem you have
| Workflow | Best fit | Key requirement | What to plan for |
|---|---|---|---|
| FFmpeg concat demuxer | A playlist whose files can be prepared as one compatible set | Matching streams, including codecs and time bases, plus accurate duration information | Normalize inconsistent sources and verify the boundary timestamps |
| Scripted file-by-file publishing through SRS | Sequential playout where a script controls which file is sent next | A script that publishes files to the SRS RTMP stream one by one | Process restarts and transition behavior; SRS documentation does not promise gapless switching |
The documentation supports these compatibility requirements and workflow descriptions, but does not establish comparative continuity, latency, or operating cost for the two approaches.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Isolate which stage fails
FFmpeg, SRS, and YouTube are separate points in the delivery path. Check them independently so a playback symptom does not send you toward the wrong fix:
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- FFmpeg input: Does FFmpeg report an error while opening or reading the next file, or show a stream or timestamp problem at the boundary?
- FFmpeg output: Does FFmpeg continue producing output after the transition?
- SRS ingest: Does SRS continue receiving the RTMP publishing stream after the file changes?
- YouTube playback: Does the problem appear only in the YouTube player even though FFmpeg and SRS continue running?
The available documentation supports checking the input and ingest workflow; it cannot identify the fault in a particular system without that system’s command and logs. The cited sources also do not establish current YouTube Live encoder requirements, ingest endpoints, account settings, or the stability of a particular connection. Check current YouTube requirements for your own stream rather than inferring them from the SRS ingest examples.
Troubleshoot common transition failures
| Symptom | Likely check | Practical next step |
|---|---|---|
| FFmpeg fails or reports stream errors as the next file starts | Whether adjacent concat inputs have the same stream count, codecs, and time bases | Compare their metadata; normalize incompatible files before using the concat demuxer |
| Playback artifacts begin at a boundary despite compatible streams | Whether the preceding file’s duration is wrong or missing | Verify the duration and, when using ffconcat, consider a correct duration directive |
| The command uses a playlist, but its behavior is unclear | Whether the input is HLS .m3u8 or FFmpeg concat/ffconcat |
Identify the actual demuxer and options in the command before applying concat-specific advice |
| FFmpeg continues but the SRS or YouTube picture stalls | Whether the publishing process still emits output and SRS still receives RTMP | Check FFmpeg output, SRS ingest, and YouTube playback separately; do not assume the player symptom proves the input cause |
| A scripted transition pauses or does not resume | How the script supervises each publishing process and advances to the next file | Inspect process start/stop handling and logs; the SRS v4 page does not promise gapless transitions |
What to collect for a system-specific diagnosis
If the boundary checks do not isolate the failure, collect the exact FFmpeg command, FFmpeg version, playlist contents, metadata for the files on both sides of the failing transition, and the relevant FFmpeg and SRS logs. Redact stream keys and other credentials before sharing commands or logs publicly. Check the documentation matching your installed FFmpeg and SRS versions; the FFmpeg reference is rolling documentation, while the cited SRS page covers archived v4.
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