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bug: Whisper VAD - Token Timestamp Issue #3174

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@sysulq

Description

@sysulq

I'm using the VAD feature with Whisper to recognize audio, and I'm using the following command. It seems strange that in the generated JSON file, the start time of the tokens begins at 0, which doesn't correspond to the timestamps.

./build/bin/whisper-cli -m /Users/pilot/.aicutpro/whisper_cpp/models/ggml-tiny.bin -f test.wav -of test -oj -pp -l en -t 4 -bo 5 -bs 5 --vad --vad-model vad_models/ggml-silero-v5.1.2.bin -fa -sow -ojf
	"transcription": [
		{
			"timestamps": {
				"from": "00:00:04,480",
				"to": "00:00:07,860"
			},
			"offsets": {
				"from": 4480,
				"to": 7860
			},
			"text": " I want to tell you what I see coming.",
			"tokens": [
				{
					"text": "[_BEG_]",
					"timestamps": {
						"from": "00:00:00,000",
						"to": "00:00:00,000"
					},
					"offsets": {
						"from": 0,
						"to": 0
					},
					"id": 50363,
					"p": 0.995989,
					"t_dtw": -1
				},
				{
					"text": " I",
					"timestamps": {
						"from": "00:00:00,070",
						"to": "00:00:00,070"
					},
					"offsets": {
						"from": 70,
						"to": 70
					},
					"id": 314,
					"p": 0.928097,
					"t_dtw": -1
				},
				{
					"text": " want",
					"timestamps": {
						"from": "00:00:00,130",
						"to": "00:00:00,370"
					},
					"offsets": {
						"from": 130,
						"to": 370
					},
					"id": 765,
					"p": 0.985233,
					"t_dtw": -1
				},
				{
					"text": " to",
					"timestamps": {
						"from": "00:00:00,370",
						"to": "00:00:00,520"
					},
					"offsets": {
						"from": 370,
						"to": 520
					},
					"id": 284,
					"p": 0.997866,
					"t_dtw": -1
				},
				{
					"text": " tell",
					"timestamps": {
						"from": "00:00:00,520",
						"to": "00:00:00,820"
					},
					"offsets": {
						"from": 520,
						"to": 820
					},
					"id": 1560,
					"p": 0.999005,
					"t_dtw": -1
				},
				{
					"text": " you",
					"timestamps": {
						"from": "00:00:00,820",
						"to": "00:00:01,040"
					},
					"offsets": {
						"from": 820,
						"to": 1040
					},
					"id": 345,
					"p": 0.996679,
					"t_dtw": -1
				},
				{
					"text": " what",
					"timestamps": {
						"from": "00:00:01,040",
						"to": "00:00:01,340"
					},
					"offsets": {
						"from": 1040,
						"to": 1340
					},
					"id": 644,
					"p": 0.993718,
					"t_dtw": -1
				},
				{
					"text": " I",
					"timestamps": {
						"from": "00:00:01,340",
						"to": "00:00:01,410"
					},
					"offsets": {
						"from": 1340,
						"to": 1410
					},
					"id": 314,
					"p": 0.993655,
					"t_dtw": -1
				},
				{
					"text": " see",
					"timestamps": {
						"from": "00:00:01,410",
						"to": "00:00:01,630"
					},
					"offsets": {
						"from": 1410,
						"to": 1630
					},
					"id": 766,
					"p": 0.997687,
					"t_dtw": -1
				},
				{
					"text": " coming",
					"timestamps": {
						"from": "00:00:01,630",
						"to": "00:00:02,080"
					},
					"offsets": {
						"from": 1630,
						"to": 2080
					},
					"id": 2406,
					"p": 0.995338,
					"t_dtw": -1
				},
				{
					"text": ".",
					"timestamps": {
						"from": "00:00:02,080",
						"to": "00:00:02,360"
					},
					"offsets": {
						"from": 2080,
						"to": 2360
					},
					"id": 13,
					"p": 0.919863,
					"t_dtw": -1
				},
				{
					"text": "[_TT_118]",
					"timestamps": {
						"from": "00:00:02,360",
						"to": "00:00:02,360"
					},
					"offsets": {
						"from": 2360,
						"to": 2360
					},
					"id": 50481,
					"p": 0.291442,
					"t_dtw": -1
				}
			]
		},

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