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If your FFmpeg video resumes after reconnecting but the YouTube stream has no sound, first check whether FFmpeg received an audio stream again. Reconnect options retry an input connection; they do not recreate audio. If audio is present, check for -an, incorrect -map options, and output encoding or mapping issues. Without your command and before-and-after logs, the specific cause cannot be identified.
Diagnose the input, mapping, and output in that order
Video continuing is not proof that the input still contains audio. Compare FFmpeg’s input stream descriptions and reconnect logs before and after the interruption, then trace any audio stream through the output mapping. This separates a source problem from a command-line selection problem or an output problem.
- Capture the logs: save the full startup and reconnect output, including the input stream descriptions and the
Stream mappinglines. - Compare the input streams: check whether an audio stream is listed before the interruption and after FFmpeg reconnects.
- Inspect the command: look for
-anand review every-mapoption. - Follow audio into the output: if the input lists audio and the command selects it, inspect the output mapping and encoding logs.
FFmpeg’s command documentation explains that automatic stream selection depends on the output format, while -map lets you select streams explicitly. The actual command and stream listing are therefore important; a fixed stream index cannot safely be prescribed without them.
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If the input has no audio after reconnecting
If the post-reconnect input listing contains no audio stream, changing output mapping cannot restore audio that the source is not supplying. The available information does not establish why the source lost audio. Check the source and its behavior around the disconnect, and capture its post-reconnect stream listing rather than treating the continuing video as evidence that both streams returned.
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If the input has audio, check the command
Look for -an
FFmpeg documents -an as disabling audio recording on the output, including audio that would otherwise be selected or mapped. If it appears among the output options, review whether it is intentional.
Review every -map
Manual mapping controls which input streams are sent to the output. Confirm that the audio stream selected by the command is actually present in the post-reconnect input. An optional audio map such as -map 0:a? permits the command to continue when that input has no audio stream; it does not restore or synthesize audio. If audio is absent, the resulting output may still have no audio.
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Inspect output handling
If the post-reconnect input has audio and the command maps it, use the output mapping and encoding logs to determine where it stops appearing. The title alone cannot establish whether the cause is stream selection, output handling, or a YouTube-side issue.
Reconnect options depend on the input protocol
FFmpeg’s reconnect controls concern retrying a connection, not selecting or restoring an audio stream. The project’s HTTP protocol implementation defines options including reconnect, reconnect_at_eof, reconnect_on_network_error, reconnect_on_http_error, and reconnect_streamed, along with retry limits and delays. These are HTTP-specific; do not assume they apply to a different input protocol.
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In the current source declaration, reconnect, reconnect_at_eof, reconnect_on_network_error, and reconnect_streamed default to false; reconnect_delay_max defaults to 120 seconds; reconnect_delay_total_max defaults to 256 seconds; respect_retry_after defaults to enabled; and reconnect_max_retries is unset (unlimited). These are HTTP implementation defaults, not universal settings for every protocol, FFmpeg version, or build. Check the installed version and the protocol actually used before changing flags.
What to provide for a specific fix
To identify the right command edit, collect these details:
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- The complete FFmpeg command, with the YouTube stream key and other secrets redacted.
- The FFmpeg version and build information.
- The input protocol or URL type.
- Input stream listings and relevant logs from before and after reconnecting.
- The complete
Stream mappingoutput and the command’s mapping and audio options.
These details show whether the problem is the source, stream selection, output handling, or a protocol-specific reconnect behavior. The FFmpeg YouTube streaming guide is a destination-specific reference, but it does not establish a universal reconnect-related audio fix.
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