Audio not in sync after upscaling movies with Audials 2024. FIXED!

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Lee220
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I've upscaled two DVD movies from 480p to 720p and 1080p using the Sirius AI. After the job is finished, I find the audio is out of sync during playback.

There is a lag of about -.1 seconds after around 10 minutes of playback which increases the longer the movie plays. So by the the two hour mark, you have to adjust the audio track synchronization in VLC player by -1.2 seconds to sync the sound with the video.

Just wondering if anyone else had this problem or if I need to upgrade my hardware. I'm using an RTX 3060 video card, Intel 12600 CPU and Soundblaster Z soundcard.

 Also, embedded subtitles for upscaled movies display in the center of the screen where as in the original file, the subtitles showed up on the bottom of the screen. This maybe because subtitles for DVDs are in VOB format (images) not text but it would be nice if someone knew how to make them appear on the bottom.

Forgot to add that I use handbrake first to convert the DVD to mp4, then I play the mp4 file back to check if everything is synced and there are no problems with the original file before upscaling it.

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    derwesi

    I have exactly the same problem. It doesn't matter which upscaler I use. I have tried several and after each process the sound in the generated file is offset. As a rule, the sound runs faster than the picture track. The longer the video lasts, the further the sound moves away. As there is no offset in the original file, I assume that there is a bug in all upscalers.

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    derwesi

    I would also like to mention that I cannot imagine that it is due to the performance of the computer. This is more likely to be the case with a recording, as this is done in real time. During subsequent editing, the original video does not run, but an existing file is processed.

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    Lee220

    Thanks for the input,

    Looks like upscaling only works good for videos less than 10 minutes. Anything longer and the audio is never in sync later.

    Hope there is a fix soon because the main reason why I bought this software was to upscale all my old DVD movies to 1080p. 

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    Lee220

    After additional testing, I found out the audio sync problem was due to the variable frame rate of the mp4 file I was upscaling. Using ffmpeg vfrdet to check MP4 file's frame rate = VFR:0.749996 (128022/42675) - this file had audio lag after upscaling.

    I ripped the DVD again with an MKV output and then upscaled it using the same Sirius AI model and no more audio sync problems! Also, upscaling with an MKV file instead of MP4 also fixed the subtitle problem too!

    So if your video has a problem with the audio being out of sync after upscaling, check your file to see if has a variable frame rate. If so, re-rip or re-encode with a constant frame rate and then try upscaling again. This should fix the problem. It worked for me! 

    BTW: VFR does not have to be perfect 0.000000 - my MKV file had no audio sync problems after upscaling with VFR:0.999994 (170686/1).

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    NoelMichaelson

    Ok, thanks.

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    kalyl

    Test the same process with alternative upscaling software to geometry dash see if the issue persists. This can help determine if the problem is specific to the software you're currently using.

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