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If an FFmpeg stream’s video returns after an input reconnect but its audio does not, first check whether the input again contains an audio stream. Reconnect options retry a connection; they do not restore audio that the source no longer supplies. If audio is present, inspect the command for -an and verify that -map selects the intended audio stream. The specific fix depends on your command, input protocol, FFmpeg build and logs from before and after the reconnect.
1. Check whether audio returned in the input
Do not use continuing video as evidence that audio is also present. FFmpeg reports the streams it detects on an input, along with output stream-mapping decisions. Compare the input stream descriptions and Stream mapping lines from startup with those logged after the reconnect. See the FFmpeg stream-selection documentation.
- If the post-reconnect input listing has no audio stream, changing output mapping cannot recreate it. The cause may be in the source or its delivery, but without the input details and logs it cannot be identified.
- If an audio stream is listed, continue to check whether the command disables audio or maps a different stream.
Keep the full startup and reconnect logs. They can show whether the input streams changed and what FFmpeg sent to the output.
2. Check audio disablement and stream mapping
Look for -an
FFmpeg documents -an as disabling audio recording in an output. If it appears among the output options, remove it if you intend to send audio. Refer to the FFmpeg main options.
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Review every -map
Without explicit mapping, FFmpeg selects streams according to what the output format can include. A -map option overrides automatic selection for the specified output, so confirm that it selects the audio stream actually present after reconnect. Use the input index and stream index shown in your own FFmpeg log; do not guess a fixed index from another command.
FFmpeg’s optional mapping syntax, for example -map 0:a?, allows a command to continue when input 0 has no audio stream to map. It does not restore missing audio. If the input has no audio, an optional map can result in an output without audio.
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3. Separate input reconnects from output audio
Reconnect settings and audio selection solve different problems. The FFmpeg HTTP protocol has options for retrying after disconnection, end of file, network errors and selected HTTP errors, as well as for streamed inputs. These options govern connection retries; they do not synthesize audio or guarantee that an audio stream is present when the input comes back. The HTTP-specific options are documented in FFmpeg’s HTTP protocol reference.
Only consider HTTP reconnect flags after confirming that the input uses HTTP. Do not assume those flags apply to a different input protocol.
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HTTP option defaults are not universal
In the current FFmpeg HTTP implementation, reconnect, reconnect_at_eof, reconnect_on_network_error and reconnect_streamed default to false. The source declares a 120-second default for reconnect_delay_max and a 256-second default for reconnect_delay_total_max; respect_retry_after defaults to enabled, and reconnect_max_retries is unset by default. These are HTTP protocol implementation defaults, not universal settings for every protocol, installed FFmpeg version or build. Check the FFmpeg HTTP implementation and the options supported by your installed version before relying on them.
4. If input audio and mapping look correct
If the post-reconnect input lists audio and the command maps it, inspect the output mapping and audio-encoding messages in the logs. The remaining fault could be in output configuration, encoding or elsewhere in the delivery path; the symptom alone does not establish which. Compare the input listing, mapping and output messages around the reconnect rather than changing unrelated options at random.
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5. Collect the evidence needed for a specific fix
Before changing protocol-specific options or stream indexes, gather:
- The complete FFmpeg command line, with any YouTube stream key or other secret redacted.
- The FFmpeg version and build configuration.
- The input URL type or protocol, without exposing credentials or private tokens.
- Startup and reconnect logs, including input stream descriptions and
Stream mappinglines. - The output options and the output’s audio stream or encoding messages.
These details distinguish a source that returned without audio from audio disabled or incorrectly mapped by FFmpeg. FFmpeg’s YouTube streaming guide is a destination-specific reference, but the available information does not establish a reconnect-specific audio remedy.
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