[mythtv-users] mythfrontend lip sync problems?
jfabernathy at gmail.com
Mon Oct 19 15:15:55 UTC 2020
On 10/19/20 10:55 AM, John Pilkington wrote:
> On 19/10/2020 14:26, Greg Oliver wrote:
>> On Mon, Oct 19, 2020 at 8:21 AM James Abernathy
>> <jfabernathy at gmail.com <mailto:jfabernathy at gmail.com>> wrote:
>> I have never had lip sync problems with mythfrontend until now. The
>> reason seems to be my FireTV Cube.
>> I do NOT have lip sync problems with mythfrontend on RPI4, FireTV 4K
>> Stick, Ubuntu PC, or Shield TV.
>> On all my Android devices, including the Cube I don't have problems
>> with lip sync on Leanfront or Kodi 18.8.
>> On the FireTV Cube only I have to edit the Audio Lip Sync to -400ms
>> so the picture and audio match. Some days it's -200ms. Since I've
>> never experienced this before, I'm wondering what could be the
>> problem? Luckily, I can adjust to fix it, but it makes me think the
>> Cube isn't so good.
>> Is lip sync a common problem or is it just me and my Cube?
>> Jim A
>> It's a definite problem with some hardware. My AT&T TV (formerly
>> DirecTV Now) box had a pretty large skew. Once I get the video
>> performing the way I like it with the playback profiles, I then match
>> up the audio sync. I never have to touch it afterward.
>> You are correct though - the leanback interfaces have always sync'ed
>> with no interaction.
> I have no experience of the FireTV Cube, but the spec for the 2019
> device suggests that it should be OK. IIUC lipsync drift in recent
> MythTV frontend has often resulted from frame dropping with greedy
> high-spec deinterlacers, and perhaps not having all available cores
> enabled. I'm not sure if that's what you are getting. Once set,
> again IIUC, the offset is remembered.
> John P
I appreciate all the help on this, but I finally realized that all my
recent problems have been because I'm trying to make the Cube perform as
well as my Nvidia Shield TV 2017 model. I never really had a problem
with the Nvidia on Mythtv-Frontend of Mythtv-leanfront. My only issues
were on non-MythTV apps like Hulu+ and Netflix frame rate on European
films. I solved those issue with beta fixes from Nvidia, so I really
have no issues with Shield TV.
I solved my FireTV Cube problem this morning by returning it to Amazon
for a full refund.
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