ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     32 size:  1024
ret:-1         st:-1 flags:0  ts:-1.000000
ret:-1         st:-1 flags:1  ts: 1.894167
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ret:-1         st: 0 flags:1  ts:-0.317508
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ret:-1         st:-1 flags:1  ts: 1.047503
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ret:-1         st:-1 flags:0  ts: 1.306672
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ret:-1         st:-1 flags:1  ts:-0.645825