livekit egress audio sounds faster than actual recording in twilio.

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1, file egress 2, opus 3, dont know 4 same players

Thanks — this is helpful. I’m responding to your note that you’re using file egress with Opus and that you’re playing both files with the same player. To diagnose why the LiveKit egress audio sounds faster than the Twilio recording I still need two quick bits of info and/or a short sample: 1) Can you run ffprobe or mediainfo on the LiveKit egress file and paste the output (or just the codec and sample rate)? For ffprobe, the useful command is:

ffprobe -hide_banner -show_streams <file>

Look for the audio stream’s codec_name and sample_rate (e.g., codec_name=opus, sample_rate=48000). 2) If possible, please share a short excerpt (5–15 seconds) of both the LiveKit file and the Twilio file — that lets me confirm whether the issue is a sample-rate mismatch, container/codec mismatch, or playback/resampling issue. Why I ask / what I’ll check once you send that: • Sample-rate mismatch: Opus typically uses 48000 Hz. If the file is labeled 48 kHz but a player interprets it as 44.1 kHz (or vice versa), it will play at the wrong speed. • Container/clocking issues: If the Opus stream’s clock/timestamps are incorrect or were remuxed/transcoded with wrong parameters, playback speed can be affected. • Transcoding path: If you transcode or re-wrap the LiveKit file (FFmpeg or other service) before comparing, that step can change sample rate/clocking. • Player behavior: Even using the same player, some players resample or rely on container metadata; the file metadata will show if that’s likely. If you prefer not to share files, paste the ffprobe/mediainfo outputs for both files and tell me: • How LiveKit egress is configured (any custom audio parameters in your egress request), and • Whether you perform any post-processing (FFmpeg commands, remuxing, or upload to another service) before Twilio records or before playback. Once I have the metadata or sample files I’ll pinpoint the cause and give exact steps to fix it (for example: re-encode to correct sample-rate, force ffmpeg to set proper timestamps, or adjust your egress settings). , with interactive elements

egress config. egress: { tracks: { fileType: egressConfig.fileType, filepath: egressConfig.filepath, output: { case: 's3', value: { bucket: egressConfig.bucket, region: egressConfig.region, accessKey: egressConfig.accessKey, secret: egressConfig.secret, }, }, }, }, filepath: 'livekit/room/{room_name}/{publisher_identity}/{track_id}-{time}.ogg', // File type for track egress (OGG for audio) fileType: EncodedFileType.OGG,

Thanks — this is very helpful. I’m responding to the egress config you shared (file egress writing OGG/Opus to S3 at the filepath you showed). To pinpoint why the LiveKit egress sounds faster than the Twilio recording I still need a couple quick diagnostics. Please supply one of the following: 1) ffprobe output for the LiveKit OGG file (and the Twilio file if you have it). Run:

ffprobe -hide_banner -show_streams <file>

Then paste the audio stream lines showing

codec_name

and

sample_rate

(for example:

codec_name=opus

,

sample_rate=48000

). OR 2) If you can’t run ffprobe, paste the exact filenames and how the Twilio recording is produced/received (which Twilio product: Programmable Video, Programmable Voice, or something else) and whether you upload the LiveKit file to Twilio or compare two independently recorded files. Also confirm: • Do you perform any post-processing or transcoding (FFmpeg commands, remux, re-encode) after egress or before playback? • LiveKit server version (if known). What I’ll check once you provide that: • Whether the LiveKit OGG/Opus file uses 48000 Hz (Opus typical) and whether Twilio’s recording uses a different sample rate. • Whether timestamps/clocking or remux/transcode steps could cause the playback rate shift. • If needed, I’ll give precise ffmpeg commands to fix sample-rate/timestamp issues or adjustments to your egress settings. If you prefer, attach a short 5–15s excerpt of the LiveKit OGG and the Twilio file and I’ll inspect metadata and confirm the exact cause and the corrective command to normalize playback. , with interactive elements

the audios are RoomComposite egress

Thanks — I’m responding to your note that both recordings come from RoomComposite egress and that the LiveKit output is OGG/Opus to S3. To diagnose the faster playback issue I need a couple quick diagnostics. Please provide one of these as convenient: 1) ffprobe output for the LiveKit RoomComposite OGG file (and the Twilio file if you have it). Run:

ffprobe -hide_banner -show_streams <file>

and paste the audio stream lines showing

codec_name

,

sample_rate

,

sample_fmt

, and any `duration`/`bits_per_raw_sample` lines. 2) If you can’t run ffprobe, tell me: • Which Twilio product produced the other recording (Programmable Video, Programmable Voice, or other)? • How you’re obtaining the Twilio recording (direct recording from Twilio, or you upload/forward the LiveKit file to Twilio)? • Whether you do any post-processing or transcoding after LiveKit egress (FFmpeg commands, remux, re-encode, or a media pipeline). • LiveKit server version (if known). Why I need this: • Opus typically uses 48000 Hz; a sample-rate mismatch (e.g., file encoded at 48 kHz but played as 44.1 kHz) will make audio play faster. The ffprobe output will confirm sample rate and timestamps. • If RoomComposite OGG is being remuxed or transcoded with wrong clock/timestamps, that can also cause speed changes. Knowing any post-processing steps will reveal that path. • Knowing how Twilio produced its recording lets me compare expected formats and clocking behavior. If you can, attach a short 5–15s excerpt of both files. If not, paste the ffprobe output and your answers above and I’ll pinpoint the cause and provide exact fixes (ffmpeg commands to normalize sample-rate/timestamps or recommended egress adjustments). , with interactive elements