[mythtv-users] ATSC Encoder change breaks Mythtv

[Taylor Ralph]

Greg,

On Fri, Oct 8, 2010 at 6:28 AM, Greg Maus <g.maus at fnmmail.com> wrote:
> On Thu, 2010-10-07 at 21:06 -0400, Taylor Ralph wrote:
>> On Thu, Oct 7, 2010 at 7:41 PM, Greg Maus <g.maus at fnmmail.com> wrote:
>> >
>> >> Have you tried playing back the video files in another player
>> >> (MPlayer,
>> >> VLC, etc). What format is the audio stream in (MPlayer will tell
>> >> you)?
>> >> What is your audio output configuration? That information will
>> >> certainly
>> >> help.
>> >
>> > The recorded files that will not play in Myth frontend play fine in all
>> > of the common media players.  I am not exactly sure what you mean what
>> > format is the audio stream.  I know that it is AC3, and that is the same
>> > audio format as files that were recorded prior to the encoder change.
>> > Is there a command line option in mplayer to get more specific audio
>> > stream info?
>> >
>> > My Mythtv audio config is pretty basic.  ASLA:default.  I have also
>> > tried ALSA:spdif, but there is no difference in playback regardless of
>> > the settings.
>> >
>>
>> You need to provide a small sample so a dev can take a look at what's going on.
>>
>> Regards.
>> --
>> Taylor
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
> A sample file has been uploaded here:
> http://filebin.ca/mhvyt/KSTP_5.1sample.mpg
> Thank you!
>

I've analyzed this video and unfortunately the FFmpeg mpegts demuxer
doesn't provide any valid video timestamps (DTS or PTS). Obviously,
this makes A-V sync impossible to accomplish. In mplayer the video
plays fine with perfect A-V sync but by default it doesn't use the
FFmpeg mpegts demuxer. So it is most likely a valid video format.
FFmpeg prints the following error when processing the video:

[mpegts @ 0x93da2c0]invalid dts/pts combination

The only way to get this resolved is to file a bug report at
http://ffmpeg.org/bugreports.html and provide the sample which you've
already created. Then open a ticket at
http://svn.mythtv.org/trac/newticket and reference the FFmpeg ticket.
Sorry I don't have better news but the sooner we get this fixed the
better since I can only imagine other broadcasters will start using
this new encoder at some point.

Regards.

--
Taylor