Created
January 26, 2021 13:52
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Example usage how to get rough timing debug information
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| $ v4l2-ctl --stream-mmap --stream-count=2 --verbose | |
| VIDIOC_QUERYCAP: ok | |
| VIDIOC_REQBUFS: ok | |
| VIDIOC_QUERYBUF: ok | |
| VIDIOC_QBUF: ok | |
| VIDIOC_QUERYBUF: ok | |
| VIDIOC_QBUF: ok | |
| VIDIOC_QUERYBUF: ok | |
| VIDIOC_QBUF: ok | |
| VIDIOC_QUERYBUF: ok | |
| VIDIOC_QBUF: ok | |
| VIDIOC_STREAMON: ok | |
| Index : 0 | |
| Type : Video Capture | |
| Flags : mapped | |
| Field : None | |
| Sequence : 0 | |
| Length : 512000 | |
| Bytesused: 512000 | |
| Timestamp: 115759.342487s (Monotonic, Start-of-Exposure) | |
| Index : 1 | |
| Type : Video Capture | |
| Flags : mapped | |
| Field : None | |
| Sequence : 2 | |
| Length : 512000 | |
| Bytesused: 512000 | |
| Timestamp: 115759.406629s (Monotonic, Start-of-Exposure) | |
| VIDIOC_STREAMOFF: ok | |
| $ ./v4l2-ctl --version && ./v4l2-ctl --stream-mmap --stream-count=10 --verbose | |
| v4l2-ctl 1.21.0-4700 | |
| VIDIOC_QUERYCAP: ok | |
| VIDIOC_REQBUFS returned 0 (Success) | |
| VIDIOC_QUERYBUF returned 0 (Success) | |
| VIDIOC_QUERYBUF returned 0 (Success) | |
| VIDIOC_QUERYBUF returned 0 (Success) | |
| VIDIOC_QUERYBUF returned 0 (Success) | |
| VIDIOC_QBUF returned 0 (Success) | |
| VIDIOC_QBUF returned 0 (Success) | |
| VIDIOC_QBUF returned 0 (Success) | |
| VIDIOC_QBUF returned 0 (Success) | |
| VIDIOC_STREAMON returned 0 (Success) | |
| cap dqbuf: 0 seq: 0 bytesused: 512000 ts: 116035.356400 delta: 116035356.400 ms (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 1 seq: 2 bytesused: 512000 ts: 116035.424378 dropped: 1 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 2 seq: 3 bytesused: 512000 ts: 116035.456412 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 3 seq: 4 bytesused: 512000 ts: 116035.492398 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 0 seq: 5 bytesused: 512000 ts: 116035.528416 fps: 29.07 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 1 seq: 6 bytesused: 512000 ts: 116035.560437 fps: 29.41 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 2 seq: 7 bytesused: 512000 ts: 116035.596393 fps: 29.17 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 3 seq: 8 bytesused: 512000 ts: 116035.632404 fps: 28.99 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 0 seq: 9 bytesused: 512000 ts: 116035.668433 fps: 28.84 (ts-monotonic, ts-src-soe) | |
| cap dqbuf: 1 seq: 10 bytesused: 512000 ts: 116035.700420 fps: 29.07 (ts-monotonic, ts-src-soe) | |
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