How to concatenate flv file into one?

Question

There is a file named input.txt

file '/home/1.flv'
file '/home/2.flv'

I can use the command to Concatenate 1.flv and 2.flv into a mp4 file.

# there are two files in output.mp4
ffmpeg -f concat -i input.txt -c copy output.mp4

When i use the following command

ffmpeg -i "concat:1.flv|2.flv" -c copy output.mp4

I found the there is only one file 1.flv in the output.mp4, why?

llogan · Accepted Answer · 2013-06-25T18:49:15.273

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I found the there is only one file 1.flv in the output.mp4. Why?

Your first command uses the concat demuxer. This can be used if you want to avoid re-encoding and when your inputs do not support file level concatenation. Using the demuxer requires that all files must have the same streams (same formats, same time base, etc.), but is a relatively recent addition so older ffmpeg builds will not have this feature.

Your second command uses the concat protocol which requires your inputs to support file level concatenation (such as MPEG-1 video, MPEG-2 video, and DV). These are two different methods of concatenating (or "joining" as it is often called by users).

Also see How to concatenate (join, merge) media files on the FFmpeg Wiki. I see you also asked this on ffmpeg-user where someone else also provided an answer: [FFmpeg-user] can't concatenate the flv file.

edited Jun 25 '13 at 18:49

answered Feb 12 '13 at 18:43

llogan

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can you please write the command for merging more than 2 videos – Muhammad Tufail Oct 10 '17 at 18:00
@MuhammadTufail See the concat demuxer in [FFmpeg Wiki: Concatenate](https://trac.ffmpeg.org/wiki/Concatenate). – llogan Oct 10 '17 at 20:16
do you know how to concat video in andorid using ffmpeg – Muhammad Tufail Oct 10 '17 at 20:26
@MuhammadTufail I don't have any Andorid experience, but I don't see why you couldn't use one of the methods in the link I provided. – llogan Oct 10 '17 at 20:53
I used all these method but not working in android. – Muhammad Tufail Oct 11 '17 at 05:23
@MuhammadTufail You can ask a new question and provide the details. – llogan Oct 11 '17 at 07:12

score 0 · Answer 2 · edited Mar 20 '17 at 10:04

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If the files are using H.264, you need to remux them first.

ffmpeg -i q.mp4 -c copy -bsf h264_mp4toannexb q.ts

ffmpeg -i r.mp4 -c copy -bsf h264_mp4toannexb r.ts

ffmpeg -i "concat:q.ts|r.ts" -c copy -bsf aac_adtstoasc qr.mp4

edited Mar 20 '17 at 10:04

Community

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answered Feb 12 '13 at 15:45

Zombo

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How to concatenate flv file into one?

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