Video Editing

This is written in March 2021.

In this page, Adobe Premiere Pro is mostly described.

Workflow

If you make a video from multiple other videos, then

1. Prepare source videos
2. Clip some videos to make import time shorter and easy to edit
   • ffmpeg might be helpful to do this
3. Import them into Premiere Pro
   • Ingest settings: Use Proxy
   • Codec: Apple ProRes or DNxHR
4. Edit a video

Codec

• DNxHQ: Standard codec as of 2018
• 10 bit codec has more color and shade options than 8 bit codec
• If a compression rate is higher, it is inefficient for video editing because it requires decompression during video editing.

Import media

• How to import .webm file?
  • Install a plugin
• Which one is better to ingest, transcoding or using proxies?
  • I do not know so far.
  • Both of transcoding and proxies needs to encode a media and it takes long time if it's a big file. If media is 2GB, you may have to wait a couple of hours to finish it.

Export media

See this video for more details about how to export videos faster in Premiere Pro. Here is a few tips from the video. For a complete tips, please watch the video.

1. Format and codec of a sequence
   • Choose lightweight but high quality format and codec. For instance,
     • Preview File Format: QuickTime
     • Codec: DNxHR/DNxHD or ProRes
   • Pre-render by hitting a return or enter key
   • Enable "Use Previews" when you export your video
2. About Bitrate ecoding settings under Video tab
   • Choose CBR (constant bitrates) and lower Target Bitrates for faster exporting
     • For example, to upload YouTube, YouTube recommendation for a HD video is 8Mbps bitrates

Audio editing

• How to speed up or down audio without changing pitch

Troubleshootings for Adobe Premiere Pro

1. How to fix spikes seen on captions when a font size is big.
   • It seems there is no configuration to solve it on captions.
     • Adobe Support Community
     • Reddit
   • Workaround is to use a drop shadowing effect. See this video for the tutorial of it.
2. How to show two videos side by side?
   • Set scale to 50 for both of two videos and change the positions of them
   • See this answer on Quora for more details.

Other tools

ffmpeg

ffmpeg is a useful command line tool to encode, trim, or do other things for video files. The example of trimming and copy a video without encoding is something like this ffmpeg -i input.mp4 -ss HH:MM:SS -to HH:MM:SS -c copy output.mp4.

Here is brief explanation of each option:

• Encoding: -c option
  • See Tutorial - Using FFMPEG for DNxHD/DNxHR encoding, resizing, and batch encoding for more details
  • Instead of -c, -c:a for audio and -c:v for video can be used
• Trimming: -ss and -to options
  • See Trim video files using FFmpeg or Cutting the videos based on start and end time using ffmpeg for more details.
  • When trimmings, there might be a black screen without showing anything on the beginning or end of the videos. It can be avoided by -allow_negative_rs make_zero.
    • See How to avoid the black screen at the beginning? for more details

Also, there is an other way to use ffmpeg.

• Check a resolution of video: ffmpeg -i [file]

Spleeter

Spleeter is a tool to extract audios from a video. See its GitHub page for more details.

It doesn't require an off-vocal video to recognize an audio inside a video.

Utagoe Vocal Ripper (歌声りっぷ)

I've never used it. It extracts an audio from a video, the same as Spleeter. This requires an off-vocal video besides on-vocal one to extract. There is few English resource, but this is an example post to explain this tool in Japanese.