How to concatenate / merge video files | Concatenation Lesson Part 01
Today, we show how to concatenate (.i.e. add one after the other) video files. Concatenation allows to merge / add both video and audio tracks / streams. All parameters can be customized to suit your needs.
IMPORTANT! All files to be concatenated need to be of the same type (same format, size, SAR, audio sample rate, ...) or the concatenation will fail or produce unpredictible results (video skipping frames, video and audio out of sync', ...)
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EXAMPLES
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❶ Concatenate 2 full videos (images & sound)
→ ffmpeg -i input01.mp4 -i input02.mp4 -filter_complex concat=n=2:v=1:a=1 output01.mp4
with:
-i input.mp4 = Imports file «input01.mp4» …
-i input02.mp4 = … and file «input02.mp4» …
-filter_complex concat = … and calls the “concat” (complex) filter function …
n=2 = … asking to concatenate 2 segments (input files), …
v=1 = … considering 1 video stream …
a=1 = … and 1 audio stream.
output01.mp4 = Outputs finally the result to file «output01.mp4»
❷ Concatenate 3 video parts (images & sound)
→ ffmpeg -ss 00:00:00.0 -to 00:00:04.5 -i input01.mp4 -ss 00:00:04 -to 00:00:08.5 -i input02.mp4 -ss 00:00:03.5 -to 00:00:04.5 -i input01.mp4 -filter_complex concat=n=3:v=1:a=1 output02.mp4
with:
-ss 00:00:00.0 -to 00:00:04.5 -i input01.mp4 = Reads file «input01.mp4» between seconds 0 & 4.5, …
-ss 00:00:04 -to 00:00:08.5 -i input02.mp4 = … reads file «input02.mp4» between seconds 4 & 8.5, …
-ss 00:00:03.5 -to 00:00:04.5 -i input01.mp4 = … and reads file «input01.mp4» between seconds 3.5 & 4.5. …
-filter_complex concat = … and calls the “concat” (complex) filter function …
n=3 = … asking to concatenate 3 segments (input files), …
v=1:a=1 = … considering 1 (v)ideo & 1 (a)udio streams …
output02.mp4 = … and outputs finally the result to file «output02.mp4»
❸ Concatenate 2 videos (sound only)
→ ffmpeg -ss 00:00:00.0 -to 00:00:05.0 -i input01.mp4 -ss 00:00:00 -to 00:00:05 -i input02.mp4 -filter_complex concat=n=2:v=0:a=1 output03.mp4
with:
-ss 00:00:00.0 -to 00:00:05.0 -i input01.mp4 = Reads file «input01.mp4» between seconds 0 & 5, …
-ss 00:00:00 -to 00:00:05 -i input02.mp4 = … and reads file «input02.mp4» between seconds 0 & 5, …
-filter_complex concat = … and calls the “concat” (complex) filter function …
n=2 = … asking to concatenate 2 segments (input files), …
v=0 = … considering 0 video stream (this means the video stream will not be concatenated to the original)…
a=1 = … and 1 audio stream.
output03.mp4 = Outputs finally the result to file «output03.mp4»
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→ Catch up with the FFMPEG guy Channel
• ALL THE VIDEOS FROM THE CHANNEL
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MUSIC
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