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Fix Video Player that support generate black image when finish playing video (reach the end of video)

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This commit is contained in:
Tuan Nghia Nguyen
2026-04-23 08:08:34 +10:00
parent f068eb716f
commit c625898f61
4 changed files with 24 additions and 17 deletions
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18
modules/ANSCV/ANSVideoPlayer.cpp
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@@ -253,7 +253,7 @@ namespace ANSCENTER {
_hwPlayer->play(); // starts read/video/audio threads
_hwEOF = false;
_hwFrameCount = 0;
_hwLastPts = 0;
_hwLastElapseMs = 0;
_isPlaying = true;
// Wait for first frame outside the mutex to let decode threads run
@@ -311,7 +311,7 @@ namespace ANSCENTER {
_hwCudaAccel = false;
_hwEOF = false;
_hwFrameCount = 0;
_hwLastPts = 0;
_hwLastElapseMs = 0;
}
else {
// --- cv::VideoCapture fallback ---
@@ -525,10 +525,14 @@ namespace ANSCENTER {
__FILE__, __LINE__);
}
// EOF detection: CFilePlayer auto-loops, but ANSVideoPlayer should stop.
// Detect when PTS wraps backwards (CFilePlayer seeked to start for looping).
if (_hwFrameCount > 10 && _hwLastPts > 0 && imgPts < _hwLastPts - 1000) {
// Position wrapped back to start → video reached end
// EOF detection: CFilePlayer auto-loops via av_seek_frame on AVERROR_EOF
// (file_player.cpp:434), so ANSVideoPlayer must detect the wrap itself.
// imgPts from getImage() is a monotonic call-counter, not a real PTS —
// use getElapse() (ms of real video position, updated from packet.pts
// in file_player.cpp:608). When the file loops, elapse drops back to ~0.
const int64_t elapseMs = _hwPlayer->getElapse();
if (_hwFrameCount > 10 && _hwLastElapseMs > 0 &&
elapseMs + 500 < _hwLastElapseMs) {
_hwEOF = true;
if (_resHeight <= 0 || _resWidth <= 0) { _resHeight = imgH; _resWidth = imgW; }
_previousImage = cv::Mat(_resHeight, _resWidth, CV_8UC3, cv::Scalar(0, 0, 0));
@@ -540,7 +544,7 @@ namespace ANSCENTER {
return _previousImage;
}
_hwLastPts = imgPts; // track for EOF detection (PTS wrap)
_hwLastElapseMs = elapseMs;
cv::Mat result = frame; // CFilePlayer returns owned Mat (already cloned internally)

3
modules/ANSCV/ANSVideoPlayer.h
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@@ -17,6 +17,7 @@
namespace ANSCENTER
{
// This class only allow to run 1 (to the end of video) then it will generate blank dark image
class ANSVIDEOPLAYER_API ANSVIDEOPLAYER
{
protected:
@@ -49,7 +50,7 @@ namespace ANSCENTER
bool _hwCudaAccel = false; // true = NVIDIA CUDA zero-copy available
bool _hwEOF = false; // true when video reached end of file
int64_t _hwFrameCount = 0; // frame counter for EOF detection
int64_t _hwLastPts = 0; // last video PTS for EOF wrap detection
int64_t _hwLastElapseMs = 0; // last CFilePlayer elapse (ms); EOF detected when it wraps backwards
ANSVIDEOPLAYER();
~ANSVIDEOPLAYER() noexcept;
[[nodiscard]] bool Init(std::string licenseKey, std::string url);