Opened 10 years ago
Closed 10 years ago
#11899 closed Bug Report - General (Fixed)
Garbled CCs on some stations
Reported by: | Owned by: | Jim Stichnoth | |
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Priority: | minor | Milestone: | 0.27.1 |
Component: | MythTV - Captions | Version: | 0.27-fixes |
Severity: | medium | Keywords: | |
Cc: | Ticket locked: | no |
Description
Closed captions of shows recorded from CBC (Canadian Broadcasting Corporation) are garbled on 0.27, but work reasonably well on 0.23. I'm in Metro Detroit where we get Windsor, Ontario TV from our cable service, Wide Open West.
My production mythtv environment is 0.23 but I want to upgrade to 0.27. In my testing I discovered this problem. I have two samples that demonstrate the problem available on my web server: http://www.hbuus.com/~buus/rollup.mpg - a show that uses rollup captions http://www.hbuus.com/~buus/popup.mpg - a show that uses popup captions CCextractor v 0.66 has no problem decoding the captions in these recordings. As proof, I am attaching rollup.srt and popup.srt.
I've also seen CC problems on one show (Buffy the Vampire Slayer) recorded from basic cable station, FX, but I want to do more testing to see if other shows on that station are affected. I also want to test other stations I care about but don't have current samples. Closed captions on HD broadcast stations and other basic cable stations appear to be OK.
Attachments (3)
Change History (10)
Changed 10 years ago by
Attachment: | rollup.srt added |
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Changed 10 years ago by
Attachment: | version.txt added |
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comment:1 Changed 10 years ago by
Status: | new → accepted |
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comment:2 Changed 10 years ago by
comment:4 Changed 10 years ago by
Milestone: | unknown → 0.27.1 |
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Helen, after committing e20a6310b1 to master, your two samples seem to show the captions perfectly. Are you able to apply this patch to your 0.27 test environment? If so, I'd appreciate if you could do more extensive testing on your recordings before I commit it to 0.27-fixes.
Note that for HD broadcasts, the default is always to prefer CEA-708 "digital" captions, so you need to go into the Subtitles submenu during playback to enable the CEA-608 "VBI" captions for testing.
comment:5 Changed 10 years ago by
I applied both e20a6310b1 and a6e72eb27 to 0.27-fixes and then tested recordings made on all the channels I regularly record, both ATSC CC and VBI CC. All work well for me, including the rollup.mpg and popup.mpg examples. I see no regressions. I believe it is safe to commit to 0.27-fixes. Thanks!
comment:7 Changed 10 years ago by
Resolution: | → Fixed |
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Status: | accepted → closed |
Thanks for the extensive testing!
A few observations so far.
Especially in light of the xine behavior, I suspect an upstream ffmpeg problem, though it's also possible that it's a problem in our avformatdecoder.cpp.