See FFmpeg encoding wiki and ffmpeg(1) § EXAMPLES.įFmpeg includes the x11grab and ALSA virtual devices that enable capturing the entire user display and audio input. However you may want to force the number of threads available by the parameter -threads number. FFmpeg should automatically choose the number of CPU threads available.Failing to do so may cause parameters being skipped or will prevent FFmpeg from executing. It is important that parameters are specified in the correct order (e.g.
> 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) 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) 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.
0 kommentar(er)
