Hardware-Accelerated Transcoding for Web Streaming guide illustration
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Hardware-Accelerated Transcoding for Web Streaming

Table of Contents

High-fidelity 4K recordings are great for archival, but they can be a nightmare to stream over a standard web browser or mobile connection. The solution is Automated Transcoding: using your hardware’s encoder (NVENC or QuickSync) to create web-friendly versions the moment a recording finishes.

Why Transcode for the Web?

Standard MP4 files from Cam Software can have massive bitrates (15 Mbps+). Transcoding allows you to:

  • Save Bandwidth: Reduce a 10GB file to a 1GB version for remote viewing.
  • Ensure Compatibility: Convert HEVC (H.265) to H.264 for older browsers.
  • Adaptive Bitrate: Prepare your library for HLS streaming.

Prerequisites

You need a GPU or CPU with a hardware encoder:

  • NVIDIA: NVENC (available on most GTX/RTX cards).
  • Intel: QuickSync (available on CPUs with integrated graphics).
  • FFmpeg: Installed and added to your system PATH.

Setting Up the Cam Software Hook

Cam Software can trigger a script every time a recording ends. We will use the on_stop event.

  1. Create a script file (e.g., transcode.sh or transcode.ps1).
  2. In Cam Software settings, set the Post-Processing command to point to this script.

The Transcoding Script (FFmpeg)

This command uses NVENC to convert your recording into a highly-compatible 1080p H.264 file with very low CPU impact.

Linux/Mac (Bash):

#!/bin/bash
# %f is passed by Cam Software as the full file path
INPUT_FILE="$1"
OUTPUT_FILE="${INPUT_FILE%.*}_web.mp4"

ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i "$INPUT_FILE" \
    -c:v h264_nvenc -preset p4 -tune hq -b:v 4M \
    -c:a aac -b:a 128k \
    "$OUTPUT_FILE"

Windows (PowerShell):

$InputFile = $args[0]
$OutputFile = $InputFile -replace "\.mp4$", "_web.mp4"

ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i $InputFile `
    -c:v h264_nvenc -preset p4 -tune hq -b:v 4M `
    -c:a aac -b:a 128k `
    $OutputFile

Advanced: HLS for Private Streaming

If you want to host your own private streaming site for your archives, you can generate HLS segments directly:

ffmpeg -i "$INPUT_FILE" \
    -c:v h264_nvenc -b:v 4M \
    -hls_time 10 -hls_list_size 0 \
    -f hls "index.m3u8"

Performance Benchmarks

On an RTX 3060, you can expect to transcode a 1-hour 4K recording in roughly 5-7 minutes using hardware acceleration, compared to nearly an hour using standard software (CPU) encoding.

Conclusion

By integrating hardware-accelerated transcoding into your Cam Software workflow, you make your high-quality archives accessible from any device, anywhere, without sacrificing your server’s performance.

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