[mythtv] Ticket #13334: Improved Video timing and Synchronization
John Pilkington
johnpilk222 at gmail.com
Tue Oct 30 16:17:08 UTC 2018
On 30/10/18 14:16, Peter Bennett wrote:
>
>
> On 10/30/18 7:39 AM, MythTV wrote:
>> #13334: Improved Video timing and Synchronization
>> -------------------------------------+-------------------------------
>> Reporter: Peter Bennett | Owner: Peter Bennett
>> Type: Patch - Feature | Status: assigned
>> Priority: minor | Milestone: 30.0
>> Component: MythTV - Video Playback | Version: Master Head
>> Severity: medium | Resolution:
>> Keywords: | Ticket locked: 0
>> -------------------------------------+-------------------------------
>>
>> Comment (by jpilk):
>>
>> Some of my comments above probably applied to earlier builds. I don't
>> usually run with -v playback.
>>
>> Playback restart after a step within the editor has a larger
>> negative AV
>> Sync offset, sometimes more than 1 sec, when not using vdpau.
>> Lipsync is
>> clearly bad initially but is quickly recovered.
>>
> John
>
> See comment 2 in the ticket. You can adjust this to be quicker but at
> the possible expense of more jitter in playback. Play around with the
> "AVsync2 audio correction" and see what setting works best for you.
>
> Peter
>
Yes, thanks, I saw that. TBH I'm not much concerned about playback
quality within the editor; I just want to get the correct byte-offset
when using the cutlist that I create, and the bad initial sync looked as
if it might perhaps break that. It doesn't seem to.
Editing DVB radio, with 1 sec steps or, with some hoop-jumping, 320 ms
steps, now seems to place the first attempted editpoints further from
where I intended than it used to, but once they sound right the output
is ok too.
The 1-frame-backward-step-jitter in the editor seems to apply to vdpau
(f28 box) but not to software decoding (el7).
John
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