- Posts: 23
- Joined: Sat May 25, 2013 1:46 pm
Hello!
My current setup includes a some consumer HDMI cameras, HDMI2SDI converters connected to a ATEM TV Studio. The audio signal is fed separately into the ATEM TVS using a Behringer DEQ2496 unit.
To determine a delay between the audio and video signal I recorded a short clip using a) MXLight and b) a sep. HDMI recording box. The video was shot with a camera, the audio equipment involved and a clapper application on an iPad.
The resulting clip (MP4 container) I imported to FinalCutProX (FCPX). There I could "see" a video delay with roughly 200ms. Adding this delay to the DEQ2496 didn't change much in an additional run. FCPX again came up with roughly 200ms delay.
To verify the results I compared audio and video with avidemux2 and Audacity, there I could determine a delay of about 90msec for the first run.
Additionally I converted the MP4 file to ProRes (using ffmepeg). Comparing MP4 and ProRes file showed different results in FCPX.
Questions:
Thanks for your support.
LagaV
My current setup includes a some consumer HDMI cameras, HDMI2SDI converters connected to a ATEM TV Studio. The audio signal is fed separately into the ATEM TVS using a Behringer DEQ2496 unit.
To determine a delay between the audio and video signal I recorded a short clip using a) MXLight and b) a sep. HDMI recording box. The video was shot with a camera, the audio equipment involved and a clapper application on an iPad.
The resulting clip (MP4 container) I imported to FinalCutProX (FCPX). There I could "see" a video delay with roughly 200ms. Adding this delay to the DEQ2496 didn't change much in an additional run. FCPX again came up with roughly 200ms delay.
To verify the results I compared audio and video with avidemux2 and Audacity, there I could determine a delay of about 90msec for the first run.
Additionally I converted the MP4 file to ProRes (using ffmepeg). Comparing MP4 and ProRes file showed different results in FCPX.
Questions:
- Is FCPX doing some "magic" with the audio when importing MP4 files and therefore falsifying my approach?
Are there any other suggestions how to measure / determine a potential delay?
Thanks for your support.
LagaV