ios - Regarding rotation information when rotating a movie in Avfoundation -


i able rotate movie following code

videocompositiontrack.preferredtransform = cgaffinetransform(rotationangle: cgfloat(m_pi_2))

i confirmed information of rotated video ffmpeg. rotate in tag not fluctuate shown below, tag called side_data_list generated , value of rotation in side_data_list fluctuated, while keeping information of rotate in tag unchanged.i want change "tag" information.

"tags": {                 "rotate": "90"         }, "side_data_list": [                 { "rotation": -90                 }

are there advice on avfoundation , ffmpeg?


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