Copyright © 2010-2023 Ted Burke, All Rights Reserved.
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Recent Posts
- Set timezone to Europe/Dublin at command line in Debian Live
- Arduino Nano Timer 1 interrupt example for 100 Hz sampling
- Running Arduino IDE in a Debian Live session
- Installing VirtualBox on Debian 11
- More PRBS turtle graphics
- PRBS visualisation in the style of turtle graphics
- Using ffmpeg to take a snapshot with a webcam in Windows
- Using a serial byte sent from an Arduino to launch an application on the PC
- Generating variations on a code analysis question in a Brightspace quiz
- How to merge two Garmin .fit files and upload to Strava on Ubuntu
- Moving statue of David Foster Wallace
- TU Dubuntu 19.10 – a customised live USB version of Xubuntu Linux 19.10 for TU Dublin
- Using Canon EOS 70D DSLR as a USB web cam in Xubuntu Linux 19.04
- TU Dubuntu – a customised live USB version of Xubuntu Linux 19.04 for TU Dublin
- Using the PHP command line web server to transfer files between devices on a local network
- €5 PPG – photoplethysmogram amplifier / Arduino circuit
- Clap detector circuit / AirSpell typing system
- AirMouse – control mouse pointer in Linux using one switch or by blowing on microphone
- Some RGB fractal doodles
- How to display USB webcam as live video on desktop using mplayer
- Ronan Byrne’s ultra low-cost brain-computer interface
- H-bridge control example for Arduino Nano (ATmega328) – two phase-displaced square waves
- An offcut from the Fraktalismus pattern factory
- Cafe Terrace at Starry Night
- €2 Robots in DIT
- A brief introduction to binary numbers…
- Can the PIC12F675 drive motors directly from its GPIO pins?
- Minimum Viable Program for PIC12LF1572
- dsPIC30F Quadrature Encoder Interface (QEI) – Basic Example
- Simple example program for the PIC12F675 microcontroller
- A simple way to read and write audio and video files in C using FFmpeg (part 2: video)
- A simple way to read and write audio and video files in C using FFmpeg (part 1: audio)
- Fraktalismus Outtakes: Sea Monsters
- Fraktalismus – my presentation at Dublin Maker 2016
- Example code from presentation: Ways of Seeing Julia Sets
- C or Python? Comparison of execution time for Mandelbrot image generation
- Julia Set Explorer
- (no title)
- What I’m working on right now…
- Simple 2-channel hardware PWM example for the MSP430G2452 microcontroller
- RoboSlam @ Dublin Maker – only two days away!
- Generating antiphase PWM signals with the dsPIC30F4011
- Very simple Python / Tkinter GUI to send selected keystrokes via serial port
- Using a dsPIC30F4011 to generating 4 PWM signals with equal duty cycles but at 90 degree phase increments
- Faster Mandelbrot image generation using numpy in Python
- Fractal variations using Python
- Using SendInput to type unicode characters
- Three PWM outputs with three different frequencies using the dsPIC30F4011 microcontroller
- 8-channel PWM with the MSP430G2553
- Simple Phaser Framework example – Flappy Words
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Tag Archives: pipe
A simple way to read and write audio and video files in C using FFmpeg (part 2: video)
In my previous post, I demonstrated how FFmpeg can be used to pipe raw audio samples in and out of a simple C program to or from media files such as WAV files (based on something similar for Python I … Continue reading
Posted in Uncategorized
Tagged C, command line, concatenate, ffmpeg, format, gcc, mp4, pclose, pipe, pixels, popen, raw, reading video, signal processing, splice, stdin, stdio, stdout, video, video processing, writing video
82 Comments
A simple way to read and write audio and video files in C using FFmpeg (part 1: audio)
C is my favourite programming language and the one I use most often. However, I have tended to shy away from using it for quick one-off signal processing tasks where I needed to read or write audio or video files … Continue reading
Posted in Uncategorized
Tagged audio, audio processing, C, command line, ffmpeg, format, gcc, MP3, pclose, pipe, popen, raw, reading audio, samples, signal processing, stdin, stdio, stdout, video, video processing, WAV, writing audio
8 Comments
Ugly speech synthesis in C
For quite a few years now, I’ve been teaching C programming to novice programmers. As I’m sure many other people who teach C have done, I got really tired of using the same old text-based example programs. The sort of … Continue reading
Posted in Uncategorized
Tagged aplay, audio, C, fwrite, pipe, speech, stdout, synthesis
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