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#1370 (Improved timestamps on AV packets) – Xpra
https://www.xpra.org/trac/ticket/1370
r15985 adds support for these timestamps in the xpra audio and video paths, disabled by default for video unless the client specifies the capability "send-timestamps=True", which can be enabled with the env var: XPRA_SEND_TIMESTAMPS=1; The timestamp value is sent as part of the audio and video metadata under the key "ts".
#13334 (Improved Video timing and Synchronization) – MythTV
https://code.mythtv.org/trac/ticket/13334
Then it uses the audio and video timestamps to either halve or double the frame rate if the audio is more than three frames out of sync. ... There is a setting that can be adjusted to improve audio sync when the audio card does not provide the application with good data on the amount of sound buffered. ... AV Sync, audio ahead by 28473771 ms ...
AV Synchronization in Android Applications (Fire TV ...
https://developer.amazon.com/docs/fire-tv/audio-video-synchronization.html
Maintaining Audio-Video Sync in Applications. The pipelines for audio and video must render their frames with identical timestamps at the same time. The audio playback position is used as primary time reference, while the video pipeline simply outputs the video frames that match the latest rendered audio frame.
Android KitKat - Android Developers
https://developer.android.com/about/versions/kitkat
Audio timestamps for improved AV sync The audio framework can now report presentation timestamps from the audio output HAL to applications, for better audio-video synchronization. Audio timestamps let your app determine when a specific audio frame will be (or was) presented off-device to the user; you can use the timestamp information to more …
Audio Video not in sync - Individual Recording - How to ...
https://openvidu.discourse.group/t/audio-video-not-in-sync-individual-recording/1912
The A/V sync issues in Chrome were caused by the sensitivity that Chrome player has to timestamp issues. Other players such Firefox are able to play the files correctly because it basically ignores the timestamp in the file. The issue is caused by gaps in the recorded timestamps. For example, say that frames 4 and 5 are missing, the recorded ...
Question / Help - Audio out of sync - can't find most ...
https://obsproject.com/forum/threads/audio-out-of-sync-cant-find-most-common-solution-device-timestamps.87221/
I've only used OBS occasionally, but I believe the setting you're looking for is found here: 1) Go to mixer under the main window 2) click the cogwheel next to the audio device for which you wish to change settings 3) click properties 4) Check " Use device timestamps".
Audio-to-video synchronization - Wikipedia
https://en.wikipedia.org/wiki/Audio-to-video_synchronization
The EBU Recommendation R37 “The relative timing of the sound and vision components of a television signal” states that end-to-end audio/video sync should be within +40ms and -60ms (audio before / after video, respectively) and that each stage should be within +5ms and -15ms. Viewer experience of incorrectly synchronized AV-sync
video - Streaming RTP/RTSP: sync/timestamp problems ...
https://stackoverflow.com/questions/11397655/streaming-rtp-rtsp-sync-timestamp-problems
The reason is that sync=FALSE tells the sink to just push out buffers as soon as it receives them. The sink drives the whole pipeline. Therefore, sync=FALSE will cause the pipeline to encode video and push it to UDP as fast as possible; it will use 100% CPU. What you need is the gstrtpjitterbuffer.
video - Timestamps are unset in a packet for stream 0 ...
https://video.stackexchange.com/questions/24462/timestamps-are-unset-in-a-packet-for-stream-0-this-is-deprecated-and-will-stop
Fix your code to set the timestamps properly [aac @ 0xb75f7880] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) frame=10213 fps= 14 q=-1.0 Lsize=N/A time=00:06:48.80 bitrate=N/A speed=0.574x. video ffmpeg audio codec sync. Share. Improve this question.
ALSA PCM Timestamping — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/sound/designs/timestamping.html
The ALSA API only allows for a single audio timestamp to be reported at a time. This is a conscious design decision, reading the audio timestamps from hardware registers or from IPC takes time, the more timestamps are read the more imprecise the combined measurements are. To avoid any interpretation issues, a single (system, audio) timestamp is ...
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