Simultaneous Recording and Real-Time Display Using ffmpeg with DeckLink

Simultaneous Recording and Real-Time Display Using ffmpeg with DeckLink

Are you looking to record and display video simultaneously? Look no further! In this article, we will guide you through the process of using ffmpeg with DeckLink to achieve this. Whether you're a beginner or an entry-level user, we've got you covered.

What is ffmpeg and DeckLink?

Before we dive into the details, let's understand what ffmpeg and DeckLink are.

ffmpeg: ffmpeg is a powerful open-source software that allows you to record, convert, and stream audio and video files. It supports a wide range of formats and provides various features for manipulating multimedia files.

DeckLink: DeckLink is a series of video capture and playback cards developed by Blackmagic Design. These cards provide professional-grade video and audio input/output capabilities, making them ideal for tasks such as video editing, live streaming, and broadcasting.

Setting Up ffmpeg and DeckLink:

Before we begin, make sure you have ffmpeg and DeckLink installed on your system. You can download and install both from their respective official websites.

Once you have ffmpeg and DeckLink installed, follow the steps below to set them up:

1. Open a terminal or command prompt.
2. Navigate to the directory where ffmpeg is installed.
3. Run the following command to list the available DeckLink devices:

This command will display a list of available DeckLink devices along with their respective indices. Note down the index of the device you want to use for recording and displaying video.

Simultaneous Recording and Real-Time Display:

Now that we have everything set up, let's move on to recording and displaying video simultaneously using ffmpeg with DeckLink.

Open a terminal or command prompt and run the following command:

Replace [input_device_index] with the index of the DeckLink device you want to use for recording and displaying video. Also, replace [output_url] with the desired output URL or file path where you want to save the recorded video.

Let's break down the command and understand its components:

• -f decklink: Specifies the input format as DeckLink.
• -i [input_device_index]: Specifies the input device index for DeckLink.
• -vf "format=yuv420p": Sets the video format to YUV420p, which is widely supported.
• -c:v libx264: Sets the video codec to libx264, which is a popular and efficient codec.
• -preset ultrafast: Sets the encoding preset to ultrafast for minimal latency.
• -tune zerolatency: Optimizes the encoding for low latency streaming.
• -b:v 5000k: Sets the video bitrate to 5000 Kbps (adjust as per your requirements).
• -f flv: Specifies the output format as FLV (Flash Video).
• [output_url]: Specifies the output URL or file path for saving the recorded video.

Once you run the command, ffmpeg will start recording and displaying video in real-time. You can stop the process by pressing Ctrl+C in the terminal or command prompt.

Conclusion:

Congratulations! You have successfully learned how to use ffmpeg with DeckLink to record and display video simultaneously. Now you can explore further and customize the settings as per your requirements.

If you encounter any issues or have any questions, don't hesitate to reach out to our tech support team for assistance. Happy recording and displaying!