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Stuttering playback in panning scenes (x264 encoded material)

tvOS Video playback support subforum
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davilla
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Joined: 26 Oct 2015, 17:01

Re: Stuttering playback in panning scenes (x264 encoded material)

Post by davilla » 23 Mar 2017, 14:46

"display to sync" syncs to the display refresh rate. Normally, audio timestamps are the source for the 'master' clock. "display to sync" switches this so that video timestamps are the source for the 'master' clock. That means video frames are never dropped/delayed to keep a/v sync and instead, audio packets are dropped or silence injected to maintain a/v sync.

Some find a dropped frame more annoying than a tiny audio blip/silence. I think it also depends on age :) I for example, just hate talking over cell phones, the audio quality is just crap and audio drop outs just make the conversation tiring. To date myself, I remember when Sprint started routing their phone signals via satellite. The delays were quite annoying and we found ourselves saying 'over' at the end of sentences like talking over ham/cb radio :)

cosmoxl
Posts: 1407
Joined: 12 Dec 2015, 14:16

Re: Stuttering playback in panning scenes (x264 encoded material)

Post by cosmoxl » 23 Mar 2017, 15:12

davilla wrote:
23 Mar 2017, 14:46
"display to sync" syncs to the display refresh rate. Normally, audio timestamps are the source for the 'master' clock. "display to sync" switches this so that video timestamps are the source for the 'master' clock. That means video frames are never dropped/delayed to keep a/v sync and instead, audio packets are dropped or silence injected to maintain a/v sync.

Some find a dropped frame more annoying than a tiny audio blip/silence. I think it also depends on age :) I for example, just hate talking over cell phones, the audio quality is just crap and audio drop outs just make the conversation tiring. To date myself, I remember when Sprint started routing their phone signals via satellite. The delays were quite annoying and we found ourselves saying 'over' at the end of sentences like talking over ham/cb radio :)
I never get audio drops, etc. when sync to display is on. but, I think since it's decoding and outputting PCM that's expected. I recall that a few years ago kodi had the ability to do sync to display but also keep passthrough/bitstream working. In that case I might get some popping noises here and there. I figured that wasn't good for my speakers so I turned that off. :)

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