ffmpeg -i 1.f4v -vcodec copy -acodec copy -vbsf h264_mp4toannexb 1.ts ffmpeg -i 2.f4v -vcodec copy -acodec copy -vbsf h264_mp4toannexb 2.ts ffmpeg -i 3.f4v -vcodec copy -acodec copy -vbsf h264_mp4toannexb 3.ts ffmpeg -i 4.f4v -vcodec copy -acodec copy -vbsf h264_mp4toannexb 4.ts ffmpeg -i "concat:1.ts|2.ts|3.ts|4.ts" -acodec copy -vcodec copy -absf aac_adtstoasc out.mp4