ffmpeg -ss 00:00:00.0 -t 00:00:10.0 -accurate_seek -i XM031_0.3_26.avi -c copy -avoid_negative_ts 1 seg1.avi
ffmpeg -ss 00:00:11.0 -t 00:00:20.0 -accurate_seek -i XM031_0.3_26.avi -c copy -avoid_negative_ts 1 seg2.avi
ffmpeg -ss 00:00:21.0 -t 00:00:30.0 -accurate_seek -i XM031_0.3_26.avi -c copy -avoid_negative_ts 1 seg3.avi
ffmpeg -ss 00:00:00 -t 00:00:30 -i IMG_2316_856x480.mp4 -vcodec copy -acodec copy output1.mp4
ffmpeg -ss 00:00:31 -t 00:00:59 -i IMG_2316_856x480.mp4 -vcodec copy -acodec copy output2.mp4
ffmpeg -ss 00:01:00 -t 00:01:30 -i IMG_2316_856x480.mp4 -vcodec copy -acodec copy output3.mp4
