Answer by Gyan for Change framerate in ffmpeg without reencoding
Here's the method using current versions of FFmpeg. It relies on the concat demuxer not rescaling the PTS of inputs after the first file, but simply applying a fixed offset. Let's say you have a 30 fps...
View ArticleChange framerate in ffmpeg without reencoding
I have a mkv (h264) video that is 23.976 fps (24000/1001) but I want to convert it to 25fps without reencoding and loosing quality. I know mkvmerge can do it ( with option --default-duration...
View ArticleAnswer by ulatekh for Change framerate in ffmpeg without reencoding
Use -itsscale on the input video to achieve an effective framerate change. It works fine with -vcodec copy.
View ArticleAnswer by Eric for Change framerate in ffmpeg without reencoding
ffmpeg -itsscale 1.0427083 -i input.mp4 -codec copy output.mp4This correctly slows down a 25 fps mp4 created by Handbrake from a PAL DVD source to 23.974 fps. The original show is NTSC. The audio stays...
View ArticleAnswer by PlantDaddy for Change framerate in ffmpeg without reencoding
Building on @Eric's answer:If you aren't doing these frame rates, the itsscale value might not be the same for you. To figure out your values, some simple math is needed.In my case, my desired frame...
View ArticleAnswer by goweon for Change framerate in ffmpeg without reencoding
You can do this using the bitstream filter setts. This also avoids the hassle of writing a raw stream out to a file, then remuxing it. This works because while you can't use normal filters with codec...
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