preparation

• if source file is h.265 (hvec) format: convert it to h.264 (avc) (mp4) with the software handbrake (also choose the english audio track), then just use those to edit. (they don't have to be .mp4 after converting, but their file size should be smaller)

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preview laggy?

• set preview quality to 1/4 (for playback and pause) and disable high-quality (in context menu)
• use the fx mute button to disable effects
• render areas that are done ( sequence » render in to out )
• enable proxies:
  • make sure adobe media encoder is installed
  • edit » preferences » media » enable proxies
  • right click on the source file in the project tab » proxies » create (choose format quicktime ) » ok » (wait a long time) » then it works
  • preview might look weird. but after exporting it uses the good version

tips

• timeline gone? open the project, go to the "project:" panel, and double click the one with the timeline icon. (you can also rename it here). that opens the timeline again. if there is none, create a new "sequence" in that panel.
• match frame: ("f" key or sequence » match frame ), goes to the source file at that time. you can drag out the audio and video from there
• clearing in+out points in timeline markers » clear in and out
• always make sure the correct (and at least one video and audio) track is selected

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export

• format: H.264 Preset: Match Source - High bitrate
• leave 8-10 seconds at the end of the video for youtube cards