Dear ZoneMinder Community,
I use the h264 pass-through branch of ZoneMinder 1.30.1 with a TrendNet TV-IP862IC. It's working great, except for one little detail:
The audio and video are not in completely in sync (I measured 0.3s delay for the audio track). I've found the reason for this delay online:
" [...] The H.264 is not a completely "contained" compression method -- by this I mean that Audio and Video tracks are still treated as separate entities that only QuickTime can recognize integrated timing information to match each track with one another. [...]"
(Source: https://support.jwplayer.com/customer/p ... ut-of-sync)
And indeed, there is no delay with the Quick Time Player, but with Windows Media Player (classic) or the ZoneMinder web player I have this short delay.
Is there anything I can do, to have a "synced" view, when I use the web player that comes with ZoneMinder?
Thank you for your help
Best,
Patrick
h.264 pass-through
-
nobodywashere
- Posts: 8
- Joined: Tue Jan 17, 2017 3:12 pm
Re: h.264 pass-through
Thanks for your reply. I'm using the feature-h264-videostorage branch. There were only some minor changes (or not, I'm not so sure 
) since I installed from the repository (in January). Which brachnes are you refering to?
Cheers,
Patrick
) since I installed from the repository (in January). Which brachnes are you refering to?Cheers,
Patrick
-
SteveGilvarry
- Posts: 494
- Joined: Sun Jun 29, 2014 1:12 pm
- Location: Melbourne, AU
Re: h.264 pass-through
Only got audio camera recently so let me see if I can test this, I wonder if VLC does it.
https://github.com/connortechnology/Zon ... orageareas, you can adjust the Debian build script to that repo and branch pretty easy.
https://github.com/connortechnology/Zon ... orageareas, you can adjust the Debian build script to that repo and branch pretty easy.
Production Zoneminder 1.37.x (Living dangerously)
Random Selection of Cameras (Dahua and Hikvision)
Random Selection of Cameras (Dahua and Hikvision)
-
nobodywashere
- Posts: 8
- Joined: Tue Jan 17, 2017 3:12 pm
Re: h.264 pass-through
Hi,
It's not working with VLC and Windows Media Player classic. I also tried remuxing (I used MP4Box), which worked in some cases, but the delay was increasing overnight and now remuxing only makes it worse
Thanks, I will look into that repository.
Best,
Patrick
It's not working with VLC and Windows Media Player classic. I also tried remuxing (I used MP4Box), which worked in some cases, but the delay was increasing overnight and now remuxing only makes it worse
Thanks, I will look into that repository.Best,
Patrick
Re: h.264 pass-through
I don't think the latest code will show any difference. in h264 video and audio tracks are given a timestamp as to when they should play. It is entirely possible that we are not converting them right. They have different time scales.
There are other issues as well. This code is experimental.
thatguy, who will be banned again shortly is referring to Shinobi, which is his zoneminder replacement. It might do what you want, but let's be clear it is NOT a ZoneMinder replacement (yet). Shinobi is a thin shell around ffmpeg, and ffmpeg is pretty good at this stuff.
There are other issues as well. This code is experimental.
thatguy, who will be banned again shortly is referring to Shinobi, which is his zoneminder replacement. It might do what you want, but let's be clear it is NOT a ZoneMinder replacement (yet). Shinobi is a thin shell around ffmpeg, and ffmpeg is pretty good at this stuff.