[Tutorial] Concatenate a List of `.flv` Files into a Single `.mp4` File

Published: August 14, 2024 by SingularityKChen (Last updated: August 14, 2024 )

• Categories:
• Tutorial 26

• Tags:
• FFmpeg 1

• Concat A List of .flv Files into a Single .mp4 File
• If the Video and Audio Codecs are Different

Concat A List of .flv Files into a Single .mp4 File

ffmpeg -f concat -safe 0 -i <(for f in ./*.flv; do echo "file '$PWD/$f'"; done) -c copy output.mp4

Or Create a .txt File to List the .flv Files

for f in ./*.flv; do echo "file '$PWD/$f'" >> filelist.txt; done
ffmpeg -f concat -safe 0 -i filelist.txt -c copy -threads 0 output.mp4

If the Video and Audio Codecs are Different

If the Video and Audio Codecs are Different, Re-encode the Video Stream with libx264 Codec:

ffmpeg -f concat -safe 0 -i filelist.txt -c:v libx264 -threads 0 output.mp4