How do I concat videos ffmpeg?
Joins clips end to end, copying streams when the inputs already match.
Join videos with FFmpeg
Joins clips end to end, copying streams when the inputs already match.
ffmpeg -i https://cdn.rendobar.com/assets/examples/sample.mp4 -i https://cdn.rendobar.com/assets/examples/sample.mp4 -filter_complex "[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1[v][a]" -map "[v]" -map "[a]" -t 8 out.mp4- Encode
- 1768 ms
- Output
- 780.4 KB
- Cost
- $0.0033
- Result
- 1280x720
job_12f3d6e2ad514364
The part everyone gets wrong
There are two different concats and they solve different problems. The concat DEMUXER copies streams and is instant, but it requires identical codecs, resolution and timebase. The concat FILTER, used here, re-encodes and accepts mismatched inputs. Reaching for the demuxer on mismatched files is where the corrupted-output reports come from.
Frequently asked questions
What goes wrong most often?
There are two different concats and they solve different problems. The concat DEMUXER copies streams and is instant, but it requires identical codecs, resolution and timebase. The concat FILTER, used here, re-encodes and accepts mismatched inputs. Reaching for the demuxer on mismatched files is where the corrupted-output reports come from.
Do I need FFmpeg installed?
Not with Rendobar. The command on this page ran through the API against a URL, with no local FFmpeg and no server. The job id below it is the job that produced these numbers.
More recipes, all measured
Trim a video without re-encoding Cuts a section out of a video by copying streams, which is effectively instant and lossless. Remove audio from a video Strips the audio track and copies the video untouched, so there is no quality loss and almost no work. Resize a video with FFmpeg Scales to a target width while computing a height that stays even, which H.264 requires. Rotate a video with FFmpeg Rotates the picture in 90-degree steps and clears the rotation metadata so players do not rotate it again.
Run this without installing FFmpeg
This exact command ran through the API against a URL.