[mythtv-users] BBC HD test card

[John Pilkington]

On 22/03/13 10:18, David Watkins wrote:
>> I just recorded the "BBC HD audio sync test" (about 2 min) and the "BBC HD
>> test card & 5.1 audio channel check" (about 8 min) from about 0902 and 0952
>> on DVB-T2 BBC HD.  I cut them from a continuous recording with MythDVBcut
>> Around 220 MiB in total.
>
>
> I've recorded these also.
>
> Doesn't cutting them out of a longer recording pose a risk of altering
> the audio/video sync, and hence make the value of the audio sync test
> a bit dubious?  I know that loss of audio sync is one of the problems
> I've had when trying to transcode recordings.

MythDVBcut in its UK HD mode just cuts the recorded stream at keyframes 
but doesn't modify it in any other way.  The display device should treat 
it just as it would a new start, and the TS format is, AIUI, designed to 
cope with transmission glitches.

I think transcoding goes to PS;  open-source TS muxers seem thin on the 
ground.

John P