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Changing example program to time decoding of test video, forwards and backwards, with time print-outs.

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This commit is contained in:
Jonathan Thomas
2025-06-04 17:19:01 -05:00
parent c95fd837b6
commit 6e73a23259
1 changed files with 31 additions and 40 deletions
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71
examples/Example.cpp
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@@ -10,59 +10,50 @@
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include <fstream>
#include <chrono>
#include <iostream>
#include <memory>
#include <QFileDialog>
#include "Clip.h"
#include "Frame.h"
#include "FFmpegReader.h"
#include "Timeline.h"
#include "Profiles.h"
using namespace openshot;
int main(int argc, char* argv[]) {
QString filename = "/home/jonathan/test-crash.osp";
//QString filename = "/home/jonathan/Downloads/drive-download-20221123T185423Z-001/project-3363/project-3363.osp";
//QString filename = "/home/jonathan/Downloads/drive-download-20221123T185423Z-001/project-3372/project-3372.osp";
//QString filename = "/home/jonathan/Downloads/drive-download-20221123T185423Z-001/project-3512/project-3512.osp";
QString project_json = "";
QFile file(filename);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
std::cout << "File error!" << std::endl;
exit(1);
} else {
while (!file.atEnd()) {
QByteArray line = file.readLine();
project_json += line;
}
}
// Path to your video
const char* path = "/home/jonathan/Downloads/openshot-testing/sintel_trailer-720p.mp4";
// Open timeline reader
std::cout << "Project JSON length: " << project_json.length() << std::endl;
Timeline r(1280, 720, openshot::Fraction(30, 1), 44100, 2, openshot::LAYOUT_STEREO);
r.SetJson(project_json.toStdString());
r.DisplayInfo();
FFmpegReader r(path);
r.Open();
// Get max frame
int64_t max_frame = r.GetMaxFrame();
std::cout << "max_frame: " << max_frame << ", r.info.video_length: " << r.info.video_length << std::endl;
const long int total_frames = r.info.video_length;
for (long int frame = 1; frame <= max_frame; frame++)
{
float percent = (float(frame) / max_frame) * 100.0;
std::cout << "Requesting Frame #: " << frame << " (" << percent << "%)" << std::endl;
// --- Measure forward pass ---
auto t0 = std::chrono::high_resolution_clock::now();
for (long int frame = 1; frame <= total_frames; frame++) {
float percent = (float(frame) / total_frames) * 100.0f;
std::cout << "Forward: Requesting Frame #: " << frame
<< " (" << percent << "%)\n";
std::shared_ptr<Frame> f = r.GetFrame(frame);
// Preview frame image
if (frame % 1 == 0) {
f->Save("preview.jpg", 1.0, "jpg", 100);
}
// (optional) preview or process f here
}
r.Close();
auto t1 = std::chrono::high_resolution_clock::now();
auto forward_ms = std::chrono::duration_cast<std::chrono::milliseconds>(t1 - t0).count();
exit(0);
// --- Measure backward pass ---
auto t2 = std::chrono::high_resolution_clock::now();
for (long int frame = total_frames; frame >= 1; frame--) {
float percent = (float(total_frames - frame + 1) / total_frames) * 100.0f;
std::cout << "Backward: Requesting Frame #: " << frame
<< " (" << percent << "%)\n";
std::shared_ptr<Frame> f = r.GetFrame(frame);
// (optional) preview or process f here
}
auto t3 = std::chrono::high_resolution_clock::now();
auto backward_ms = std::chrono::duration_cast<std::chrono::milliseconds>(t3 - t2).count();
std::cout << "\nForward pass elapsed: " << forward_ms << " ms\n";
std::cout << "Backward pass elapsed: " << backward_ms << " ms\n";
r.Close();
return 0;
}