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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