Quick answer: Expect to pay AU$25 to AU$60 for a converter that takes composite video at 480i or 576i and scales it to 1080p, one way only. Choose a box with a 5 V USB power input, PAL and NTSC support, and stereo audio through the red and white sockets. Latency runs 16 to 50 ms, fine for a set top box and hopeless for gaming. Composite is the lowest rung of analogue video, so set expectations low before you compare it with a modern stream. Nothing recovers detail: a 720 by 576 source stays soft on a 4K panel.
Composite video arrives on one yellow plug at 1 V peak to peak into 75 ohm, carrying roughly 5 MHz of luma and a colour subcarrier riding on top. HDMI expects a digital stream at 4.95 Gbit/s for 1080p60. A converter bridges those worlds with an analogue to digital stage and a scaler, and the quality of that scaler decides the entire result.
One Direction Only: Composite In, HDMI Out
What the sockets accept
The yellow socket takes composite video, and the red and white pair take line level audio at about 2 V root mean square. Some boxes add a 4 pin S-Video input, which separates luma from chroma and removes most dot crawl. Cheap units accept NTSC 480i only and show PAL 576i in black and white, so confirm both standards on the label before paying.
What no converter can fix
Composite shares one channel between brightness and colour, so colour bleed and dot crawl are already in the signal. A 576i frame carries 720 by 576 pixels, and the scaler has to invent every pixel above that. A good box makes the result watchable on a 55 inch panel; no box makes it sharp.
What the Scaler Does With 480i
Deinterlacing decides the look
The first job is deinterlacing: 480i and 576i carry half a frame every 50th or 60th of a second, and the box must weave or bob those fields into whole frames. Cheap chips bob, which makes horizontal edges jitter on movement. Boxes above AU$40 use motion adaptive deinterlacing and look calmer on sport and news tickers.
Pick the output the panel wants
The second job is scaling to a fixed output. Set 1080p when the display is 4K or 1080p, and 720p for older 1366 by 768 panels. Leaving the box on 1080p into a 720p projector forces the projector to scale again and softens text. One scaling step, done by the better device, always wins.
Power, Latency and Audio Traps
Most converters run from 5 V at 1 A over micro USB, and a television USB port often supplies less than that, which shows as flicker or dropouts. Use the supplied mains adaptor. Audio is embedded as two channel PCM at 48 kHz, so surround sound from an old DVD player is lost and dialogue defaults to the left and right mix.
| Input | Source lines | Output | Latency (ms) | Price band (AUD) |
|---|
| Composite | 480i | 1080p60 | 16 to 30 | AU$25 to AU$40 |
| Composite | 576i | 1080p60 | 20 to 40 | AU$30 to AU$50 |
| S-Video | 576i | 1080p60 | 20 to 45 | AU$40 to AU$60 |
| Composite | 480i | 720p60 | 16 to 35 | AU$25 to AU$45 |
| Composite | 576i | 1080p60 | 35 to 50 | AU$50 to AU$60 |
Choosing Between Converter Boxes
Checklist before you pay
Look for PAL and NTSC in the specification, a 5 V input with a supplied adaptor, phono audio inputs rather than a 3.5 mm jack, and a metal case that survives a rack. A box that lists only 480i is an NTSC unit. Where one source must feed a projector and a recorder, feed the converter into an hdmi splitter versus switch and keep the analogue side untouched.
Cable choice still matters after conversion. A 1080p60 stream needs 4.95 Gbit/s, which any High Speed lead manages to 5 m, and the hdmi cable rating categories page explains the Premium and Ultra High Speed tiers. For recording on a laptop, an hdmi to usb adapter takes the converted output into USB video at 1080p30.
Describe the source device, its output standard and the display to zongcarrie@zh-zong.com or call +86 13543026126. You get a converter recommendation with the correct power rating, plus an AUD quote and freight to any Australian capital.
Practical scenarios
- Situation: A Adelaide clinic keeps a 2008 DVD player for patient education and needs it on a 65 inch panel. What to do: Use a powered composite converter set to 1080p60 and feed the panel input directly.
- Situation: A Gold Coast townhouse has a Foxtel set top box with composite output only. What to do: Set the box to 576i output, convert to 1080p, and check the audio menu for stereo PCM.
- Situation: A Western Sydney warehouse wants a security recorder on a wall display 15 m away. What to do: Convert at the recorder, then run the HDMI over Cat6 rather than extending composite.
- Situation: A Hobart church hall projects a laptop slide deck through an old VGA projector. What to do: Convert composite to 720p60 for that projector and keep the output fixed at 4:3.
FAQ
Does an RCA to HDMI converter improve picture quality?
No. It makes an old analogue signal compatible with a modern input and removes the need for a VCR style tuner. Detail, colour and noise stay as they were, because the information is not in the source. What improves is stability and the ability to display on a panel with no analogue inputs at all.
Will it work with a Foxtel or Fetch box?
It works when the box has composite outputs and you set them to a standard the converter accepts, usually 576i. Recent Foxtel and Fetch hardware favours HDMI, so check the rear panel first. Where HDMI already exists, converting down to composite and back up only adds softness and delay.
Why is there a delay between picture and sound?
The deinterlacer and scaler buffer at least one frame, which adds 16 to 50 ms, and some televisions add their own processing on top. If the audio runs through a separate amplifier, use the converter phono outputs so both paths share the same delay, or apply a delay setting on the amplifier.
