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+--- Thread: Does Extract Chapter Images use Transcode Settings (/t-does-extract-chapter-images-use-transcode-settings)
Does Extract Chapter Images use Transcode Settings - Dunning Kruger - 2024-08-09
Does Extract Chapter Images use Transcode Settings?
I'm setting up a dedicated VM for Jellyfin and it's extracting chapter images. I'm not seeing the ffmpgeg processes in nvtop for my nvidia card. I do during a movie transcoding or trickplay.
Is there something about Extract Chapter Images that is CPU only?
RE: Does Extract Chapter Images use Transcode Settings - TheDreadPirate - 2024-08-09
There isn't really a lot to accelerate for chapter image extraction. Here is an example command that Jellyfin runs for extracting an image.
Code:
/usr/lib/jellyfin-ffmpeg/ffmpeg -f matroska -ss 00:19:31.962 -i file:/media/storage2/testMovies/Evangelion 3.0+1.0 Thrice Upon a Time/Evangelion 3.0+1.0 Thrice Upon a Time.mkv -threads 0 -v quiet -vframes 1 -vf scale=round(iw*sar/2)*2:round(ih/2)*2,thumbnail=n=24 -f image2 /cache/temp/628c9eee-454d-496f-95b2-0eeca47d5d73.jpgLiterally pulling out a single frame at a particular time stamp. Disk performance for the media storage is the bottleneck, really.
RE: Does Extract Chapter Images use Transcode Settings - ca2ju - 2024-08-26
What is the difference between extracting chapter images and the keyframe extractor?
RE: Does Extract Chapter Images use Transcode Settings - TheDreadPirate - 2024-08-26
My understanding is that keyframes are used to increase the speed of scrubing on the time line of a video when transcoding.
Chapter images are for this.
RE: Does Extract Chapter Images use Transcode Settings - ca2ju - 2024-08-26
now i understand, thanks bro!