[mythtv-users] Odd response to forward

[Stephen Worthington]

On Sun, 23 Mar 2014 17:36:55 -0700, you wrote:

>On Sun, Mar 23, 2014 at 5:05 PM, Dick Steffens <dick at dicksteffens.com> wrote:
>> Last night we watched something I had recorded with my old ReplayTV before I
>> had Myth running. I used the ReplayTV download function to transfer the .mp4
>> (and several other .mp4 files) to my desktop machine. The, when Myth was
>> running, I copied those files to the Myth machine, and moved them to
>> /var/lib/mythtv/videos. Then I used the function (don't remember the name,
>> or where it is) to have Myth discover those videos.
>>
>> The movie included some commercial breaks. When we got to them I used the
>> jump ahead function (right arrow on the remote) a few times to get to the
>> next part of the movie. The odd thing was that the first time I hit the
>> right arrow, instead of jumping forward, it jumped back. Further
>> applications of the right arrow did jump forward. That sequence was repeated
>> for each commercial break. Otherwise, the movie played correctly.
>>
>> Any idea what was going on there? I haven't had that problem with any videos
>> recorded by Myth, nor with the other imported videos that were recorded on
>> my ReplayTV.
>>
>> Possibly unrelated: When we finished watching that movie I tried to delete
>> it. Myth said it could not. This afternoon I was noodling around and noticed
>> that I was the owner of that file. Once I changed the ownership of that file
>> and the associated .png file to mythtv, Myth was able to delete the video. I
>> went back and looked in /var/lib/mythtv/videos and, sure enough, the video
>> file was gone, however the png file was still there.
>>
>> Also possibly unrelated, somehow the .mp4 file had an extra dot in front of
>> the .mp4, so movie..mp4. I know that's no problem for Linux to deal with,
>> but is that why Myth didn't delete the .png file, which has only one dot?
>>
>> Thanks in advance.
>>
>> --
>> Regards,
>>
>> Dick Steffens
>>
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>
>Note: I've seen this before but never bothered to investigate it that
>much. Below is just an educated guess as to what is happening.
>
>Sounds like a time sync issue (IIRC, from a damaged or non-indexed
>video). I'd bet that if you ran a stopwatch while watching it, they
>wouldn't be in sync after a few minutes. Basically, you've watched 10
>minutes of show, but the time bar reports you are at a different time
>(for instance, the 8 minute mark). So when you were skipping forward,
>you hit the 30 second skip button, mythtv says ok, he's at 8 minutes,
>skip to 8:30. At that point, it skips to the actual 8 minute 30 second
>mark of the video (the part you already watched). So it was always
>skipping forward according to mythtv, it just didn't really know where
>you were.
>
>Thanks,
>
>Thomas Mashos

Your description of a time sync issue is what I have always suspected
in the few video files I have run across that have had this problem. I
have never been able to work out just what files will have the problem
though - it appears that some software out there just creates files
that do this when played on MythTV.  It may be a problem with MythTV
somewhere, as my best recollection of my problem files is that with
most of them, if I play them with mplayer instead of MythTV's internal
player, the problem goes away.