I am looking for a command to join two video files, however I want the videos joined split-screen, frame by frame, instead of one after another.
Any ideas? Seems this is not possible with ffmpeg.
With a recent version of ffmpeg (assuming both videos are the same resolution):
ffmpeg -i input1.mp4 -i input2.mp4 \
-filter_complex \
"[0:v]pad=iw*2:ih[int]; \
[int][1:v]overlay=W/2:0[vid]" \
-map "[vid]" \
-c:v libx264 -crf 23 \
output.mp4
This essentially doubles the size of input1.mp4 by padding the right side with black the same size as the original video, and then places input2.mp4 over the top of that black area with the overlay filter.
If one of your videos has an audio track that you need to add to the output, add the option -map 0:a
for the first file's audio, or -map 1:a
for the second file's audio.
If you have two audio tracks that you would like to mix, use the amix
filter:
ffmpeg -i input1.mp4 -i input2.mp4 \
-filter_complex \
"[0:v]pad=iw*2:ih[int]; \
[int][1:v]overlay=W/2:0[vid]; \
[0:a][1:a]amix=inputs=2:duration=longest[aud]" \
-map "[vid]" \
-map "[aud]" \
-c:v libx264 -crf 23 \
-c:a aac -b:a 192k \
output.mp4
Unrecognized option 'crf'. Error splitting the argument list: Option not found
. If I remove cr
then unrecognized option 'preset'
[Parsed_pad_0 @ 0x1e6e1c0] Input area 0:0:445:369 not within the padded area 0:0:890:368 or zero-sized
Simply adding 1 to the width and height of the output gets rid of this problem: ffmpeg -i left.avi -i right.avi -filter_complex \ '[0:v]pad=iw*2+1:ih+1[int];[int][1:v]overlay=W/2:0[vid]' \ -map [vid] -c:v libx264 -crf 23 -preset veryfast output.avi
Commented
Mar 19, 2018 at 21:14