> ffmpeg -i unCut.MP4 -ss 00:00:18.440 -to 00:00:20.440 cut.MP4Ģ) Cut video while making every frame a keyframe (seems to reduce quality) ffprobe -f lavfi -i 'movie/path/to/input.mp4,blackdetect out0' -showentries tagslavfi.blackstart,lavfi.blackend -of defaultnw1 -v quiet TAG:lavfi.blackstart0 TAG:lavfi.blackend5.42208 TAG:lavfi.blackstart73.4067. First, a better way to get the blackdetect output is via ffprobe because it is capable of writing structured data such as XML, JSON or one keyvalue per line. I don't think any of those listed in the FAQ (/help/en/002.html) are lossless, correct?ġ) Cut video unCut.MP4 from 18.44s to 20.44s (video is 100 Hz and times where manually picked in Kinovea (toe off in my case) Here's a way to do it with the blackdetect and trim filters. But I have no idea which can be read by Kinovea. I understand, that this is not an ffmpeg forum, but since Kinovea uses it internally, maybe the developers have some insight here?ģ) Perhaps I could resolve the quality issue by exporting in ffmpeg to a lossless format. I would have thought, that only file size and playback performance would worsen. I'm not sure why this is, but I'm new to video editing/encoding. VLC can still play it).Ģ) If I convert the video in ffmpeg to turn all frames into keyframes, the quality drops (in/output is MP4 and I'm not recording). Seems like Kinovea is using it as a building block, too.ġ) If I happen to cut to a position which is not a keyframe (aka i-frame), Kinovea can not load the video anymore (screen appears black, yet e.g. So far ffmpeg () seems to be my best shot. That is, I have a Excel/csv file with video filenames and start/stop frames manually established through Kinovea. I'm trying to programmatically cut videos before using them in Kinovea.
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