On Monday, 20 December 2021 11:16:14 GMT Wols Lists wrote: > On 20/12/2021 08:25, Neil Bothwick wrote: > > On Mon, 20 Dec 2021 07:55:15 +0000, Wols Lists wrote: > >> With pretty much every bit of linux software I've found, I have to > >> import my source into a project, make a meal of deleting the sections I > >> don't want, and then I can't just "save a file", I have to tell the > >> program loads of crap that I don't have a clue about, I just want my > >> new file to be EXACTLY THE SAME as the original, just missing the bits > >> I've deleted. > > > > Avidemux works just like that, select the bits you don't want, delete > > them, save using the copy codec, which does no transcoding. > > > > Or you can use a different codec/bitrate/whatever if you also want to > > reduce the size. > > Ummm. > > I don't know what the problem was, but I know I tried Avidemux, and it > really didn't work for me. afair, it just got slower and slower, and was > taking hours to save a file. Maybe a couple of days to save a 2hr video, > that sort of thing ... > > Cheers, > Wol
kdenlive would be the same, IF you are transcoding the streams. If you are just clipping sections, but copying over the same codecs and remuxing, it will be much faster. I've tried various GUIs and found I was wasting more time learning how each application worked, than actually doing work. So I reverted back to using ffmpeg on CLI. ffmpeg -ss 00:03:00 -i input.mp4 -codec: copy -t 00:43:00 output.mp4 The above works a treat to clip start and end on a video and is fast. If I need to clip many bits along the length of the video, e.g. removing adverts from a TV transmission, then I clip them separately and concatenate them as shown here: https://trac.ffmpeg.org/wiki/Concatenate When I want to transcode streams I use hardware acceleration which is faster and cooler than burning CPU cycles, e.g.: ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -ss 00:04:12 -i input.ts -vf format='nv12|vaapi,hwupload' -codec:v h264_vaapi -codec:a ac3 -t 00:59:08 output.ts
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