ffmpeg tips

ffmpeg.sh

# losslessly concat mp4 files
ffmpeg -i input1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i input2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output.mp4

# concat files with the same format
# 1. create a file list
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'
# 2. concat
ffmpeg -f concat -i mylist.txt -c copy output

# encode Xvid
ffmpeg -i input.avi -c:v mpeg4 -vtag xvid -b:v 600k -c:a libmp3lame output.avi

# encode h264
ffmpeg -i input.avi -c:v libx264 -preset ultrafast -crf 22 -c:a copy output.mp4

# Black detect (0.04 is one frame)
ffmpeg -i test.avi -vf blackdetect=d=0.04:pix_th=.01 -f rawvideo -y /NUL

# change resolution + cut 20 seconds(0:00-0:20)
ffmpeg -i input.avi -ss 0 -t 20 -c:v libx264 -s 640x360 -c:a copy output.mp4

# encode mp4 file for ipad use
ffmpeg -i input.mp4 -c:v libx264 -preset medium -b:v 1200k -s 640x360 -c:a libvo_aacenc -b:a 64k output.mp4

# add watermark
# top left corner
ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=10:10 [out]" outputvideo.flv

# Top right corner
ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" outputvideo.flv

# Bottom left corner
ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" outputvideo.flv

# Bottom right corner
ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=(main_w-overlay_w-10)/2:(main_h-overlay_h-10)/2 [out]" outputvideo.flv

# center
ffmpeg -i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=main_w/2-overlay_w/2:main_h/2-overlay_h/2 [out]" outputvideo.flv

# Demux
ffmpeg -i inputvideo.mp4 -f mp3 audio.mp3
ffmpeg -i inputvideo.mp4 -c copy -an video.mp4

# Blur
ffmpeg -i intro.mov -vf "boxblur=5:1" intro-blur.mov

# Split video by keyframe
ffmpeg -i INPUT.mp4 -acodec copy -f segment -vcodec copy -reset_timestamps 1 -map 0 OUTPUT%d.mp4

# Cut by keyframes vs. cut by all frames. Note arguemnts are position dependent.
# http://www.markbuckler.com/post/cutting-ffmpeg/
# keyframes only
ffmpeg -ss 30 -i input_vid.mp4 -t 60 -c copy output_clip.mp4 
# all frames
ffmpeg -i input_vid.mp4 -ss 30 -t 60 -c copy output_clip.mp4


# Find all keyframes
ffmpeg -i .\bloodstained-v.mkv -vf "select=key[a];[a]showinfo=checksum=false" -an -f null -
# - or -
ffprobe -select_streams v -show_frames -show_entries frame=pkt_pts_time,pict_type -v quiet -of csv .\bloodstained.mkv  | grep I