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I have tried the method described in an answer to "How can I remove multiple segments from a video using FFmpeg?". It works well, except that the audio is missing. Can anyone suggest how to get both the video and audio into the output?

I have a 2min video shot on holiday, of a kangaroo. There are 2 sections of it (both about 6secs long) I want to extract (including the audio) into a single, short piece with just these 2 cute bits.
I know I can extract two separate bits, and join them, but the article mentioned above allowed me to do exactly what I wanted, but THERE IS NO AUDIO when you follow that method.
I would like to use a similar single call of ffMpeg.

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possible duplicate of How can I remove multiple segments from a video using FFmpeg? – Sickest Feb 27 '14 at 7:58
NO, this is not a duplicate. Its really an extension. How to get the audio as well as the video. – BruceR Feb 27 '14 at 8:33
Please clarify: do you want to get one section from a longer file, and this smaller section should have both audio and video? Or is it something else? Please edit your question and add an example case to illustrate. – Rajib Feb 27 '14 at 9:05
I have edited the original, as requested. I find it odd that some people point to my question as a duplicate, when I mentioned the referenced article in my question, and ask for help extending the functionality. That shows a lack of research by the respondents, not me. – BruceR Mar 1 '14 at 0:59
The original answer by ptQa in the referenced thread did not include the audio stream. See the answer below to see the added audio stream and pads. The 2 step process is given only for matter of completeness. – Rajib Mar 2 '14 at 7:28

1 Answer 1

up vote 1 down vote accepted

Here I am assuming that your original file is in mp4 container, but the method should work for other containers as well.

One step method- (slightly more involved) Also see the answer given by ptQa in the referenced thread. But here is the same with audio added:

ffmpeg -i inputfile.mp4 -filter_complex "[0:v]trim=start=10:end=16,setpts=PTS-STARTPTS[a];  [0:v]trim=start=20:end=26,setpts=PTS-STARTPTS[b]; [0:a]atrim=start=10:end=16,asetpts=PTS-STARTPTS[c]; [0:a]atrim=start=20:end=26,asetpts=PTS-STARTPTS[d]; [a][c][b][d]concat=n=2:v=1:a=1[e][f]" -map '[e]' -map '[f]' -strict -2 outputfile.mp4    

This adds the audio stream and neccesary pads to get audio.

Provided for completeness:

The Easy Way: You could use the 2 step process which you are already aware of:

First Cut and extract the 2 pieces you want out of the full length video.
Second Join these 2 pieces together.

This should be the easy way out.

To cut a piece from say the third second to ninth second:

ffmpeg -i in.mp4 -ss 00:00:03 -to 00:00:09 -c:v copy -c:a copy part1.mp4    

You can repeat the process for the second part. If it is from 10th second to 16th second:

ffmpeg -i in.mp4 -ss 00:00:10 -to 00:00:16 -c:v copy -c:a copy part2.mp4

Also, see this thread for more details.

Now you have 2 files which you can join. You can "concatenate" in at least 3 different ways. The way to do it without re-encoding is to do it through the demuxer option. Create a text file named (say) joinlist.txt with this content:

file 'part1.mp4'
file 'part2.mp4'

To join the two files place the 2 movies and text (joinlist.txt) in the same folder and use this command:

ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4
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Thank You, Rajib, that is exactly what I was looking for. I had tried a number of ways of selecting audio, but defining the 2 video bits and the 2 audio bits as output suitable for the next step eluded my various attempts (guesses!) at the syntax. Once again Thank You – BruceR Mar 2 '14 at 22:55
If this solves your problem you might want to accept the answer by using the check mark. – Rajib Mar 3 '14 at 2:41
Sorry; New at this. Thanks – BruceR Mar 8 '14 at 16:02
Thanks and you're welcome :) – Rajib Mar 8 '14 at 16:55

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