On Sat, Jul 20, 2024 at 9:55 PM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> I don't know of any tool where you can simply pick up a frame and move it > while you're watching a stream. You might be able to use shuffleframes for > uniform runs, but when the pattern changes you're stuck with making > intermediate shuffleframes until the uniformity returns. That would require > you to make splits based on frame numbers and it could get really ugly. > Hi Mark, Thanks again for your insightful help. Well, fortunately (if I dare say so), once the camera starts mangling a video, it is always the same pattern that gets repeated. But I often leave the camera recording for periods between half an hour and 2 hours and the GoPro splits videos in chunks of around 4GB (which is about 11 minutes with my settings). In other words, I have 5 or 7 files to which I should apply the same shuffling pattern, but the split between video files is not always on a 5-frame boundary, so I need to start reshuffling after 0..4 frames depending on the file. Hence my quest to drop a few frames before applying the shuffling, ideally without reencoding. As the 2-pass (seek + shuffle) worked, I tried to achieve it without reencoding by piping the video between two ffmpeg processes, like so: ffmpeg -i in_bad_frame_order.mp4 -ss 0.04 -t 5 -f rawvideo -vcodec rawvideo -video_size 3840x2160 -r 30 -pix_fmt rgb24 pipe: | ffmpeg -y -f rawvideo -vcodec rawvideo -video_size 3840x2160 -r 30 -pix_fmt rgb24 -i pipe: -vf "shuffleframes=1 0 3 4 2" out.mp4 It seems to work on a small excerpt, but it is quite slow (memory issue maybe) - and of course I'm losing the audio, which must then be extracted, trimmed and remuxed separately. Do you think there is a way to make ss and shuffleframes play along nicely ? Or, back to my initial idea, editing the frames PTS so that they play in the right order, without any reencoding at all (see the setpts formula in my original question) ? Kind regards, Vincent _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
