[mythtv-users] Regression? 0.26+20130221 Time sync issues

[Frank Feuerbacher]

I have been using mythtv and ubuntu 12.10 on my new machine since 
mid-January. I was running fine with 0.26. I was applying updates 
several times a week. I stopped applying updates due to system crashes 
that set in (I have resolved those, I think it was wine, which I removed).

I had a backlog of encodings so it took me a while to notice this 
problem. I strongly believe that it crept in around the middle of 
February. I'll try to get a precise date this evening if I can correlate 
when I recorded the shows. I don't know of apt-get keeps a history of 
applied updates. If it does, I'll report back on that.

The movies originate as mpeg-2 transport streams.

What I find VERY interesting is that before using mythtv, I was 
experimenting using NextPVR on my Windows 7 box with the very same 
channels and InfiinTV card. I would always have to run the captured .ts 
files through Project-X (or some other tool) to clean it up before 
Avidemux or Handbrake would touch it. *But on occasion,* I got files 
that behaved the same as now: Handbrake would report time sync issues, 
and Handbrake would produce h.264 video that would play at almost 2x 
time and the audio had lots of drop outs. Using VideoRedo would fix the 
problem, except for the last two minutes of the recordings, where it 
would revert to the bad behavior. My assumption was that I overloaded 
the CPU (or I/O) with handbrake jobs. But, on my new Ubuntu/mythtv setup 
I have never experienced any problem encoding and recording at the same 
time. I will, of course, do a test with no other activity on the system 
while recording.

On 3/1/2013 4:20 PM, Jim Stichnoth wrote:
> On Fri, Mar 1, 2013 at 2:07 PM, Frank Feuerbacher <fbacher at brisbin.net> wrote:
>> For some time now I have been capturing HD movies with mythtv, trimming them
>> with Avidemux 2.5.6 and the encoding with Handbrake. About a week ago I
>> applied 2:0.26.0+fixes.20130221.c3fff6e-0ubuntu0mythbuntu2 amd64. Now the
>> resulting .mkv files are unusable. The audio and video are sped up and
>> jerky. Handbrake reports many sync: audio time went backwards and other
>> errors, resulting a numerous dropped frames. Viewing the .mpgs in Avidemux
>> exhibits some audio problems.
>>
>> Unrelated to this problem is that I have always found the audio in Avidemux
>> and Handbrake to be ~750ms out of sync and constant.
>>
>> I'm using an InfiniTV PCIe device with cablecard and 1088i mpeg transport
>> stream content. I have a quad core 3.4GHz box. I am just beginning to
>> analyze the problem. I tried the latest updates last night and the problem
>> is still present. I'll see if I can find an older update to try (I would
>> rather not rebuild it myself). If it is indeed a mythtv issue, then it
>> should have crept in fairly recently since I had been applying frequent
>> updates.
>>
>> Any other thoughts about how to resolve this?
> What version of MythTV were you running before this broke?
>
> What format video are you capturing?  You mentioned 1080i, but is it
> mpeg2 or h.264?
>
> This seems like it must be a recorder issue, but I'm not aware of much
> going on in 0.26 with respect to recorders with the exception of the
> HD-PVR.
>
> Jim
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