[fernandovg]

I'm a Raspbmc user and notice with 30-Oct NB that when video lags (my raspbmc has other programs running and sometimes it lags a little) the subtitles continue to play so when video stops lags there's a delay between video and subtitle.

What I do to "fix" its jump back and jump forward but sometimes even when jump back it lags too and sub and video gets out of sync. I keep jump back forward until no lags.

The problem here is not the lag, but the sync between video and sub. Maybe there's only a resync of subs when jump back/forward. Pausing didn't work.


I can't confirm this hasn't happened before. But its hard to reproduce as my RPI don't lag often.

[miappa]

Yes, I have seen this as well on my bedroom Pi where I use a wi-fi bridge and it is quite annoying.
Lags only occur on big 1080 mkv´s but it is fairly easy for me to reproduce it, so if anyone want any logs let me know.

I set the following in advancedsettings.xml, it will be slower to start and jump in videos, but it helped me with this problem:

Code:

<advancedsettings>

  <network>
    <alwaysforcebuffer>1</alwaysforcebuffer>
    <cachemembuffersize>104857600</cachemembuffersize>
    <readbufferfactor>4.0</readbufferfactor>
  </network>

</advancedsettings>

Note that the buffer size is quite big, but it works good for me.

Edit: I am almost 100% certain that I saw this prior to Oct 30 nightly...

[fernandovg]

Mine is wired. Playing 1080p videos also. My lag is not network but high cpu usage from others programs

[miappa]

Mine is also wired (using a Airport express as bridge) and I it seems like the same issue.
However you might be right: buffer settings workaround might not help you since the lag is caused by high CPU... but it might be worth a shot.

[popcornmix]

What type of sub (text based or graphical)?
Can you post a log of when this happens.

[miappa]

I will get a log + mediainfo when I get home tonight. I cannot remember if it was internal subs or external .srt (in any case most certainly text files and not graphical).

Edit: @fernandovg
The workaround (which might not be a valid workaround for you anyway) I believe only work in Gotham (but I am uncertain about the Frodo backport).

[fernandovg]

Mine is Gothan and .srt (external)

[miappa]

I had to disable the force buffer, but could reproduce this quite easily.
I opened movie.mkv, skipped twice (20 minutes) and got lags almsot immediately, but subtitles kept going and therefor un-syncing.
Kept it playing for a couple of minutes and got more lags and subtitles got more un-synced.

Mediainfo
xbmc.log

[fernandovg]

popcornmix, any news on this ?
Thanks!

[popcornmix]

popcornmix, any news on this ?

Not yet. I'll try to look into it this weekend.

[fightnight]

It happens to me. Video freezes and subtitles keep playing.

[popcornmix]

I've tested this on Gotham, with a file with external srt, and I'm copying a file (over nfs) whilst playing a video, and that causes the video to underrun and stutter.
subtitles keep in sync with the audio.

@fernandovg - are you sure you've seen this fail with a recent Gotham build?

[fernandovg]

I will check with a new NB and let you know

[fernandovg]

I tried with the last available build (Nov-13) in Raspbmc but It didnt play my videos.
See whats happens:
https://www.dropbox.com/sc/y5919ddlpmmlfr9/5e9BBnGMu0

With 30-Oct it plays ok.

I contacted Sam about no new NB available and Im waiting so I can test it.

[fightnight]

It happens on latest frodo release.

I just updated to latest nightly and so far no problems.

But with this nightly I have one weird problem. If i seek, it shows all lines of the subtitle at the same time.

Sorry for my bad english.

EDIT: exactly like fernando video!