[mythtv-users] How to transcode HD recording

[John Pilkington]

On 11/01/14 02:04, HP-mini wrote:
> On Thu, 2014-01-09 at 20:14 +0000, John Pilkington wrote:
>> On 07/01/14 23:29, John Pilkington wrote:
>>> I made comments earlier in this thread about wide and variable spacing
>>> of keyframes in FreeviewHD UK programmes.  I've been looking at this a
>>> bit more, and my latest test recordings have been better behaved.  The
>>> problem certainly exists, but it may be unusual.
>>
>> I have just found that for a recording from DVB-T2 FreeviewHD (h264), a
>> listing of the markup data generated after mythcommflag --rebuild
>> contains only a small subset of the lines in a similar listing made
>> immediately after recording.
>>
>> In the 'original' table, keyframe separation is typically around 24
>> frames.  In the 'rebuilt' table the spacing is variable, sometimes in
>> the hundreds.  Points listed there are also in the original table.
>>
>> In my experiments I have often been working with recordings having a
>> rebuilt seektable.  This explains why editing has sometimes been difficult.
>>
>> Should I open a Ticket?
>>
>
> How about a 100MB sample cut from beginning of recording using "dd" ?
>
> The UK freeview H264 HD sample clips (I have here) behave well..my
> seektables had to be generated by mythcommflag..
>
> Broadcast OTA H264 uses intra-refresh so the peak bitrate is
> constrained. All the broadcast samples (I have seen) use this & have
> about 2 sec keyframe intervals.
>

http://code.mythtv.org/trac/ticket/12010

I will attach markup files and a link to a short clip asap.