Conference video: LED screens, recording and streaming at one event

Define the result for each destination

Ask what people seated in the room should see and what remote viewers need. Also agree on the files to be delivered afterward: the final program, individual camera recordings, slides or a combination.

This example has one room, one presentation, slides, clips, graphics and two cameras. The presentation feeds the LED wall, while the recording and streaming program switches between cameras and presentation content. That is a choice for this example; change it if the room needs live camera images on screen or different coverage.

Use a table everyone can review

The table below describes logical destinations. Before setup, fill in ports, adaptations and formats for the selected models. A line in the diagram does not confirm that a device has the connection shown.

The example LED canvas is 1600 × 1000 pixels. This teaching example comes from the LED content map (Spanish); it is not confirmed inventory. The processor input signal still needs to be agreed.

Deliver files with a name and version

Deliver the approved file with titles, graphics and small text that let the team check readability. If there are different versions for LED and streaming, identify the destination in each file name. Use those same names in the worksheet and show rundown.

Record who can approve a change and the deadline for receiving materials. When an update arrives, confirm which version it replaces and check the received file. Keep a copy of the approved version so you can return to it.

Separate the pixel canvas, signal format and framing

The LED canvas describes the pixels used on the screen. In the signal-path worksheet, also record the resolution and frame rate of the signal reaching the processor. Ask the technician to confirm that combination in the model-specific manual.

Resolume Advanced Output lets you assign parts of a composition to different outputs and adjust the feed to the LED processor. Bring the project output map to rehearsal and compare its labels with the worksheet.

Decide who prepares the content and who calls the cue

For each program moment, identify what needs preparing and who confirms it can go live. If one person handles several tasks, agree on the sequence so they can rehearse it.

In OBS Studio Mode, you can prepare another scene in Preview and transition it to Program. Watch the destination receiving Program during the test: a prepared scene alone does not confirm what reaches the audience.

Include an audio worksheet with the video plan

List the speaker microphone, audience questions and clip audio. For each source, record what is heard in the room, what feeds the program and what must be kept in the recording. Confirm the mix with the audio lead.

If you add remote guests or languages, expand the diagram. Use the streaming (Spanish) and interpretation (Spanish) guides to check what each participant receives. The example diagram does not include those additional paths.

Check the recording while the stream is running

Rehearse the functions that will run together: camera switching, playback, recording and streaming. Save a short take, close it properly and open it in an application that can check the agreed tracks.

The OBS recording guide distinguishes recording and encoder settings; using options that differ from the stream can consume additional resources. Choose a configuration for your system and test it under the rehearsal workload.

Rehearse difficult transitions before doors open

Run a speaker entrance, a cut to slides, a clip with sound, a question and a break. Have one person watch the LED wall and another watch the stream, then review the recording. Record the program moment, destination and what happened.

Also test what each destination will show while a problem is being corrected. Agree on who makes the decision and what material is ready. Mark any untested path as outstanding in the worksheet.

Bring the worksheet to the technical meeting

Download the signal worksheet and fill in what you already know. It records destinations, formats, responsibilities, materials and test results. Include it with your request and the room plan.

To continue planning, see screens and content (Spanish), cameras (Spanish), recording (Spanish) and internet (Spanish). Use the same source and destination names throughout the worksheets.

Identify what changes in the picture

Before adjusting anything, save a clip of the problem. Note which camera and destination show it, whether the shot is static or moving, and what content is on the LED wall.

Brompton describes moiré as interference between the panel pixel grid and the sensor grid. It distinguishes this from sync and PWM artifacts; it does not propose correcting that spatial pattern in the processor.

Moiré: test every shot and the planned movement

Record the planned framing and the speaker’s movement, changing one variable per attempt. Note zoom, iris, focus and the camera-to-speaker and speaker-to-LED distances. Check both the face and the background: defocusing the LED can make text you need to retain unreadable.

On the HXC-FB80, check the focus-assist area (Spanish). If the detection area includes the background, the reading may be drawn away from the person. Check the person in the recorded image.

Compare banding and color at each destination

Save a sample from each camera and note its format, shutter setting and where bands appear. During rehearsal, change one control per attempt and compare the recording. On the FR7, check ECS and Flicker Reduce (Spanish). Test the other cameras separately.

If a face changes color only on the LED wall, first compare the same signal at the other destinations. For Tessera SX40/S8, the ChromaTune guide (Spanish) explains color-specific correction. Check logos and graphics too.

Make these comparisons off air. Keep the starting settings, change one condition per attempt and retain both clips. If an improvement harms another destination, note that difference before agreeing on the adjustment.

Use the camera-and-LED section of the signal worksheet. Assign each outstanding check to someone. To review paths and equipment with GLMedia, see video processing and cameras and streaming.

Audio ahead of the TV picture: compare the signal paths

Compare sound and picture at each destination before delaying a mix. If HDMI feeds a display and the analog outputs feed a recorder, measure and document those paths separately.

The television’s processing is one stage to check. Identify its model and available modes, and compare each part of the path. The total delay you observe is not a measurement of the converter’s latency.

The Blackmagic Converters manual, July 2024, pages 34–38 identifies the Mini Converter SDI to HDMI 6G outputs and internal paths. HDMI with embedded audio and the analog output allow separate monitoring paths; the diagram on page 38 helps identify which stage you are comparing. It does not provide a total delay for a particular TV or mixing setup.

Use the same visible and audible gesture in a rehearsal take. First check HDMI picture and sound together on the TV. Then identify the analog path and compare it against the same reference. Note where each result was observed and any other processing between the source and listening point. If the recording is aligned but the TV is late, investigate the TV branch before changing audio for every destination.

Use the monitoring and sync worksheet to record LED, recording and stream results separately. If the setup includes a scaler, also see the MD-HX/MD-LX converter guide (Spanish): Mini Converter 6G controls belong to that model and do not transfer to another converter.

HDMI Instant Lock: testing switch 1 on the Mini Converter 6G

In the July 2024 manual, page 35, switch 1 controls HDMI Instant Lock on the Mini Converter SDI to HDMI 6G. It keeps HDMI output active when switching between inputs of the same video standard and can add picture and audio delay. Setting it to OFF avoids the delay added by that function; it does not demonstrate zero delay throughout the chain.

To compare, save the initial state and test ON/OFF off air with the source, format and destination unchanged. Repeat the visible and audible gesture in both states. Then check the planned source changes and whether the TV retains or recovers picture and sound. Record both sync and continuity: disabling a function that helps switching can change output behavior.

If the delay remains, identify the models and settings elsewhere in the path before trying another control. Hearing your own voice in a hybrid panel needs a separate check: it can be uncomfortable even when the program is aligned.

When planning video processing and distribution, add the listening and viewing points used for each comparison to the map. Record the configuration to be used at the event and the tests still outstanding.