Recorded video cannot be played in iOS

[vincent1000]

I recorded some videos and they can be played in windows and android, but they cannot be played when I put them in my iphone. I thought that the encoder may be incompatible with iOS, so I convert them with ffmpeg, something like "ffmpeg -i input.mp4 -c:v libx264 -crf 23 -profile:v baseline -level 3.0 -pix_fmt yuv420p -c:a aac -ac 2 -b:a 128k -movflags faststart ksk-output.mp4". After that, the videos can be played in iphone. So I wonder whether there are some settings to fix it. I use the following when recording: VideoEncoderOptions = new VideoEncoderOptions { Framerate = 30, IsFixedFramerate = true, IsFragmentedMp4Enabled = true, IsThrottlingDisabled = false, IsHardwareEncodingEnabled = true, IsLowLatencyEnabled = false, IsMp4FastStartEnabled = false }

[vincent1000]

Find the root cause. IsFragmentedMp4Enabled should be false in order to play in iOS.