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mpegplayer A/V sync - please report experiences

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linuxstb:

--- Quote from: Didro on March 28, 2007, 05:46:41 AM ---I tried to set off Skip Frames option: video became good. Besides that A/V sync is good too in many videos but in other audio goes ahead video.

--- End quote ---

Didro,

Can you upload your video somewhere for me to analyse?

Amblin:
So far, I have tried a number of files, from different sources, all encoded from different codecs like XVID and DIVX, with 2 different programs, TMPEG 4.0 and
recently WinFF. It seems to me that at the beginning of each file, after about 5 seconds, the plugin skips forward 2-3 seconds of audio and stays that way for the remainder of the video.

Llorean:
Again, he needs a sample video where this doesn't occur playing the video on the PC, but does on the device.

As you may have guessed, problems that are readily apparent don't happen with the video's he's encoded (and that skipping after 5 seconds hasn't happened with any I've encoded) so just describing the bug isn't necessarily enough information.

If that happens then you should just need to encode a 20 second video or so to demonstrate it. Also, of course, it's expected that you're testing on unmodified official Current Builds

Amblin:
Ok, Ive had a breakthrough. On both WinFF and TMPEG 4, if I manipulate the screen ratio (16:9 to 4:3 for example) on a clip, the A/V will play in sync on my computer but not on the plugin. If I choose to leave the ratio alone, the A/V will play in sync on the plugin just fine. This issue has also come about when converting clips for the OF's video player. Its beyond me why something like changing the screen ratio would affect sound, but some of you more tech people should know..

linuxstb:
Amblin,

I can't replicate your problems with my own files - can you give me a copy of a video you've encoded that plays correctly on your PC, but not in Rockbox?

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