ZoneMinder Forums

Hi

I try to record with audio on Escam 360 eye

I select H264 passthrough and audio stream

rtsp://admin:admin@10.0.0.208:554/onvif1
UDP

All is ok live view and record on Chrome without sound but i think is AAC codec

But on Zmninja sound is ok but no Video, it's black

If i download video from zmninja and i read on pc with VLC i have video but no sound

Output #0, mp4, to 'essai.mp4':
Metadata:
title : H.264 Video, RtspServer_0.0.0.2
encoder : Lavf58.45.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 896x896, q=-1--1, 5 fps, 10240 tbn, 5 tbc
Metadata:
encoder : Lavc58.91.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s
Metadata:
encoder : Lavc58.91.100 aac


DO you know why
thanks

Sounds like the timestamps are out of sync.

Almost every problem I've had with getting video storage to work has been about the timestamps. Sounds like I need to get access to this cam and figure out what magical thing it is doing.

So to explain:
We record from camera and there are two streams, 1 for video 1 for audio and each packet has a timestamp. Let's say they start from 0 (they don't always). At some point we want to start recording, so first I seek back in our buffer and find a keyframe (video has to start with a keyframe). It will have a timestamp of 123456789. (timestamps aren't always seconds. Each stream will likely have it's own timestamp units. Video is often second/90000 audio is often 8000Hz). So I take that first keyframe and it's timestamp, save the timestamp, alter it to 0 and then use the saved timestamp to calculate the timestamp of all the other packets I write to the mp4. But we have to convert units, Deal with negatives, out of order packets, buffering delays, etc. It's a nightmare.