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I have a Seagate drive plugged into the usb port on my Aura, and have VLC installed. The sound is ahead of the video. I’ve tried several settings, but can’t sync it. Does anyone know how to sync VLC audio on 5he Aura?
Will VLC play them OK on a PC. I have files on a USB stick. The audio delay is set on my aVR and no lip synch issues. Recordings made on the box have significant delay built in to the audio by the broadcaster.
Install MediaInfo on a computer. Open one of the files. Select view- tree export the text data to a file. It should include the built in audio delay relative to the video.
This is part of the analysis of a Channel 4-HD recording. You would need a built in delay of around the same to lip synch the files.
Not sure how you created them. TSmuxerGUI can remux files and adjust the audio relative to the video.
Audio
ID : 302 (0x12E)
Menu ID : 17664 (0x4500)
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Muxing mode : LATM
Codec ID : 17
Duration : 2 h 14 min
Bit rate mode : Variable
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Delay relative to video : -1 s 152 ms
Language : English
There’s a fairly easy way to test this. Use the Box Webif to export a HD recording to a PC. It will be transcoded to SD. Copy the file to your usb drive and check if it plays back without lip synch issues.
To have any chance of lip synch playback external files would need at least a built in audio delay of around 1000ms.
Suspect this is related to the request asking for the opposite correction.
The basic principle is pretty simple.
The amount of data the video decoder has to handle is massively larger than the audio decoder.
The difference is around a very large 1 second. Ergo the audio always needs to delayed around 1 second or so to get anywhere near the video output.
The built in delays are much smaller than this. It has to be the files you are using perhaps with zero delays to the audio. Without some idea as to the built in delay in the problem files this thread is going nowhere.
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