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

Frank Feuerbacher fbacher at brisbin.net
Sat Mar 2 05:27:32 UTC 2013


I am still testing, but it appears that the problem resolved itself 
after the the update built on 02/27/2013. The break seems to have 
occurred sometime between 02/05/2013 and 02/21/2013. If I learn anything 
different I will give an update.

Frank

On 13-03-01 04:59 PM, Frank Feuerbacher wrote:
> 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
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>

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