ffmpeg -i Sign_Language_Recognition.mp4 -vcodec copy -acodec copy -vbsf h264_mp4toannexb 1.ts
ffmpeg -i Sign_Language_Recognition.mp4 -vcodec copy -acodec copy -vbsf h264_mp4toannexb 1.ts
ffmpeg -i "concat:0.ts|1.ts" -vcodec copy -acodec copy -absf aac_adtstoasc out.mp4