static async Task fragmp4(int seconds)
{
// This generates a "fragmented" MP4 which should be larger than an MP4
// with a normal single MOOV atom trailer at the end of the file. See:
// https://superuser.com/a/1530949/143047
// 10 seconds of "-badmp4" is 34MB
// 10 seconds of "-fragmp4" is 26MB regardless of the other options described in the link
// 60 seconds (bad) is 219MB versus 208MB (frag) and again we lose 2 seconds
// -g is keyframe rate, default is 250
// -flush_packets 1 flushes the I/O stream after each packet, decreasing latency (apparently)
// adding two seconds to the requested duration approximates the regular file size (10s = 33MB, 60s = 218MB)
seconds += 2; // HACK! see above
var cam = GetConfiguredCamera();
var pathname = ramdiskPath + "video.mp4";
Directory.CreateDirectory(ramdiskPath);
File.Delete(pathname);
Console.WriteLine("Preparing pipeline...");
cam.ConfigureCameraSettings();
using (var ffmpeg = new ExternalProcessCaptureHandler(
new ExternalProcessCaptureHandlerOptions
{
Filename = "ffmpeg",
Arguments = $"-framerate 24 -i - -b:v 2500k -c copy -movflags +frag_keyframe+separate_moof+omit_tfhd_offset+empty_moov {pathname}",
EchoOutput = true,
DrainOutputDelayMs = 500, // default
TerminationSignals = new[] { Signum.SIGINT, Signum.SIGQUIT }, // not the supposedly-correct SIGINT+SIGINT but this produces some exit output
}))
{
// quality arg-help says set bitrate zero to use quality for VBR
var portCfg = new MMALPortConfig(MMALEncoding.H264, MMALEncoding.I420, quality: 10, bitrate: 0, timeout: null);
using var encoder = new MMALVideoEncoder();
using var renderer = new MMALVideoRenderer();
encoder.ConfigureOutputPort(portCfg, ffmpeg);
cam.Camera.VideoPort.ConnectTo(encoder);
cam.Camera.PreviewPort.ConnectTo(renderer);
Console.WriteLine("Camera warmup...");
await Task.Delay(2000);
Console.WriteLine($"Capturing MP4: {pathname}");
var timerToken = new CancellationTokenSource(TimeSpan.FromSeconds(seconds));
await Task.WhenAll(new Task[] {
ffmpeg.ManageProcessLifecycleAsync(timerToken.Token),
cam.ProcessAsync(cam.Camera.VideoPort, timerToken.Token),
}).ConfigureAwait(false);
}
// can't use the convenient fall-through using or MMALCamera.Cleanup
// throws: Argument is invalid. Unable to destroy component
cam.Cleanup();
Console.WriteLine("Exiting.");
}
static async Task badmp4(int seconds)
{
Console.WriteLine("\n\nWARNING:\nffmpeg can't create a valid MP4 when running as a child process.\nSee repository README. This code is here for reference only.\n\nPress any key...");
Console.ReadKey(true);
var cam = GetConfiguredCamera();
var pathname = ramdiskPath + "video.mp4";
Directory.CreateDirectory(ramdiskPath);
File.Delete(pathname);
Console.WriteLine("Preparing pipeline...");
cam.ConfigureCameraSettings();
using (var ffmpeg = new ExternalProcessCaptureHandler(
new ExternalProcessCaptureHandlerOptions
{
Filename = "ffmpeg",
Arguments = $"-framerate 24 -i - -b:v 2500k -c copy {pathname}",
EchoOutput = true,
DrainOutputDelayMs = 500, // default
TerminationSignals = new[] { Signum.SIGINT, Signum.SIGQUIT }, // not the supposedly-correct SIGINT+SIGINT but this produces some exit output
}))
{
// quality arg-help says set bitrate zero to use quality for VBR
var portCfg = new MMALPortConfig(MMALEncoding.H264, MMALEncoding.I420, quality: 10, bitrate: 0, timeout: null);
using var encoder = new MMALVideoEncoder();
using var renderer = new MMALVideoRenderer();
encoder.ConfigureOutputPort(portCfg, ffmpeg);
cam.Camera.VideoPort.ConnectTo(encoder);
cam.Camera.PreviewPort.ConnectTo(renderer);
Console.WriteLine("Camera warmup...");
await Task.Delay(2000);
Console.WriteLine($"Capturing MP4: {pathname}");
var timerToken = new CancellationTokenSource(TimeSpan.FromSeconds(seconds));
await Task.WhenAll(new Task[] {
ffmpeg.ManageProcessLifecycleAsync(timerToken.Token),
cam.ProcessAsync(cam.Camera.VideoPort, timerToken.Token),
}).ConfigureAwait(false);
}
// can't use the convenient fall-through using or MMALCamera.Cleanup
// throws: Argument is invalid. Unable to destroy component
cam.Cleanup();
Console.WriteLine("Exiting. Remember, video.mp4 is not valid.");
}
static async Task stream(int seconds)
{
var cam = GetConfiguredCamera();
MMALCameraConfig.VideoResolution = new MMALSharp.Common.Utility.Resolution(640, 480);
MMALCameraConfig.SensorMode = MMALSensorMode.Mode7; // for some reason mode 6 has a pinkish tinge
MMALCameraConfig.VideoFramerate = new MMAL_RATIONAL_T(20, 1);
Console.WriteLine("Preparing pipeline...");
cam.ConfigureCameraSettings();
// note cvlc requires real quotes even though we used apostrophes for the command line equivalent
using (var vlc = new ExternalProcessCaptureHandler(
new ExternalProcessCaptureHandlerOptions
{
Filename = "cvlc",
Arguments = @"stream:///dev/stdin --sout ""#transcode{vcodec=mjpg,vb=2500,fps=20,acodec=none}:standard{access=http{mime=multipart/x-mixed-replace;boundary=7b3cc56e5f51db803f790dad720ed50a},mux=mpjpeg,dst=:8554/}"" :demux=h264",
EchoOutput = true,
DrainOutputDelayMs = 500, // default
TerminationSignals = ExternalProcessCaptureHandlerOptions.signalsVLC
}))
{
var portCfg = new MMALPortConfig(MMALEncoding.H264, MMALEncoding.I420, quality: 0, bitrate: MMALVideoEncoder.MaxBitrateMJPEG, timeout: null);
using var encoder = new MMALVideoEncoder();
using var renderer = new MMALVideoRenderer();
encoder.ConfigureOutputPort(portCfg, vlc);
cam.Camera.VideoPort.ConnectTo(encoder);
cam.Camera.PreviewPort.ConnectTo(renderer);
Console.WriteLine("Camera warmup...");
await Task.Delay(2000);
Console.WriteLine($"Streaming MJPEG for {seconds} sec to:");
Console.WriteLine($"http://{Environment.MachineName}.local:8554/");
var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(seconds));
await Task.WhenAll(new Task[] {
vlc.ManageProcessLifecycleAsync(timeout.Token),
cam.ProcessAsync(cam.Camera.VideoPort, timeout.Token),
}).ConfigureAwait(false);
}
// can't use the convenient fall-through using or MMALCamera.Cleanup
// throws: Argument is invalid. Unable to destroy component
cam.Cleanup();
Console.WriteLine("Exiting.");
}
