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I am trying to delete a few sections of a video using FFmpeg.

For example, imagine if you recorded a show on television and wanted to cut out the commercials. This is simple with a GUI video-editor; you just mark the beginning and ending of each clip to be removed, and select delete. I am trying to do the same thing from the command-line with FFmpeg.

I know how to cut a single segment to a new video like so:

ffmpeg -i input.avi -ss 00:00:20 -t 00:00:05 -map 0 -codec copy output.avi

This cuts a five-second clip and saves it as a new video file, but how can I do the opposite and save the whole video without the specified clip, and how I can I specify multiple clips to be removed?

For example, if my video could be represented by ABCDEFG, I would like to create a new one that would consist of ACDFG.

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possible duplicate of Splitting video in multiple episodes with ffmpeg, also perhaps check out Using FFMpeg to cut a video into 2 minute clips –  Ƭᴇcʜιᴇ007 Nov 28 '13 at 20:18
    
That is not what I am asking, I would like to get it all in one "episode", but this would have different sections from the original video. –  Matias Nov 29 '13 at 15:21
    
@Matias, if you were asking how to cut a few clips out of the video and leave the rest as is, that would be one thing, but you want to take a few clips from it and combine them with clips from other videos which makes this not a separate, unique question. You have to do what the other questions asked to get the separate segments, then combine them. –  Synetech Nov 29 '13 at 16:47
    
@Synetech thanks for your answers. I do not want to combine them with clips from other videos. I just want to remove some parts from the videos. For example, if my video could be represented by ABCDEFG, I would like to create a new one that would consist of ACDFG. –  Matias Nov 29 '13 at 17:10
    
@Synetech That wasn't me, it was Tog who must have missunderstood. –  Matias Nov 29 '13 at 17:47

3 Answers 3

Well, you still can use the trim filter for that. Here is an example, lets assume that you want to cut out segments 30-40 sec (10 sec) and 50-80 sec (30 sec):

ffmpeg -i in.ts -filter_complex \
"[0:v]trim=duration=30[a]; \
 [0:v]trim=start=40:end=50,setpts=PTS-STARTPTS[b]; \
 [a][b]concat[c]; \
 [0:v]trim=start=80,setpts=PTS-STARTPTS[d]; \
 [c][d]concat[out1]" -map [out1] out.ts

What I did here? I trimmed first 30 sec, 40-50 sec and 80 sec to end, and then combined them into stream out1 with the concat filter.

About setpts: we need this because trim does not modify picture display time, and when we cut out 10 sec decoder counter does not see any frames for this 10 sec.

If you want to have audio too, You have to do the same for audio streams. So the command should be:

ffmpeg -i utv.ts -filter_complex \
"[0:v]trim=duration=30[av];[0:a]atrim=duration=30[aa];\
 [0:v]trim=start=40:end=50,setpts=PTS-STARTPTS[bv];\
 [0:a]atrim=start=40:end=50,asetpts=PTS-STARTPTS[ba];\
 [av][bv]concat[cv];[aa][ba]concat=v=0:a=1[ca];\
 [0:v]trim=start=80,setpts=PTS-STARTPTS[dv];\
 [0:a]atrim=start=80,asetpts=PTS-STARTPTS[da];\
 [cv][dv]concat[outv];[ca][da]concat=v=0:a=1[outa]" -map [outv] -map [outa] out.ts
share|improve this answer
    
Great one! Why do we need setpts? Could you add the explanation? –  Rajib Dec 1 '13 at 4:32
    
Ok, see updated answer. –  ptQa Dec 2 '13 at 7:41
2  
+1 This really should be selected as the answer. It is more suited for "multiple segments" and removes the necessity to perform multiple commands one after another. (unless another way is more speed efficient) –  Knossos Dec 17 '13 at 10:19
    
For the record, when I tried this with serveral segments (about 8) I got an error message about a "buffer queue overflow" and the program crashed. I don't know which versions are affected by this, but I wouldn't want to use this method for that reason. –  Wutaz Feb 13 at 22:35
up vote 1 down vote accepted

Although the answer provided by ptQa seems to work, I have developed an other solution which has prooved to work fine.

Essentially, what I do is to cut one video for each part of the original video that I want to include on my result. Later, I concatenate them with the Concat Demuxer explained here.

The solution is the same that waht I have tried first and presented sync problems. What I have added is the command -avoid_negative_ts 1 when generating the different videos. With this solution, the sync problems dissapear.

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I made a script to speed up editing recorded TV. The script asks you for the beginning and end times of segments you want to keep and splits them out into files. It gives you options, you can:

  • Take one or multiple segments.
  • You can combine the segments into one resulting file.
  • After joining you can keep or delete the part files.
  • You can keep the original file or replace it with your new file.

Video of it in action: here

Let me know what you think.

 #!/bin/bash
/bin/date >>segmenter.log

function segment (){
while true; do
    echo "Would you like to cut out a segment ?"
    echo -e "1) Yes\n2) No\n3) Quit"
    read CHOICE
    if [ "$CHOICE" == "3" ]; then
        exit
    elif [ "$CHOICE" == "2" ]; then
        clear
        break
    elif [ "$CHOICE" == "1" ]; then
        clear
        ((segments++))
        echo "What time does segment $segments start ?"
        read SEGSTART
        clear
        echo -e "Segment $segments start set to $SEGSTART\n"  
        echo "What time does segment $segments end ?"
        read SEGEND
        clear
        echo -e "Segment $segments end set to $SEGEND\n"
        break
    else
        clear
        echo -e "Bad option"
        segment "$segments"
    fi
done
if [ "$CHOICE" == "1" ]; then
    echo "Cutting file $file video segment $segments starting at $SEGSTART and ending at $SEGEND"
    ffmpeg -i "$file" -ss $SEGSTART -to  $SEGEND -map 0:0 -map 0:1 -c:a copy -c:v copy  "$filename-part$segments.$extension"  >> segmenter.log 2>&1
    clear
    echo -e "Cut file $filename-part$segments.$extension starting at $SEGSTART and ending at $SEGEND\n"                             
    segment "$segments"
fi
}

file="$1"
filename="${file%.*}"
extension="${file##*.}"
clear
segments=0
segment "$segments"
clear
if (("$segments"==1)); then
mv $filename"-part1."$extension "$filename-segmented.$extension"
elif (("$segments">1)); then
echo "Would you like to join the segments into one file ?"      
       OPTIONS="Yes No Quit"
       select opt in $OPTIONS; do
       clear
        if [ "$opt" == "Quit" ]; then
            exit
        elif [ "$opt" == "Yes" ]; then
            clear
            echo "Joining segments"
            ffmpeg -f concat -i <(for f in $filename"-part"*$extension;         do echo "file '$(pwd)/$f'"; done) -c:a copy -c:v copy "$filename-segmented.$extension" >>         segmenter.log 2>&1
            clear
            echo "Would you like to delete the part files ?"
            select opt in $OPTIONS; do
            clear
            if [ "$opt" == "Quit" ]; then
                exit
            elif [ "$opt" == "Yes" ]; then
                for f in $filename"-part"*$extension; do rm $f; done
                break
            elif [ "$opt" == "No" ]; then
                break
            else
                clear
                echo -e "Bad option\n"
            fi
            done
            break
        clear
        elif [ "$opt" == "No" ]; then
            exit
        else
            clear
            echo -e "Bad option\n"
        fi
    done
fi
echo "Would you like to replace the original file with the result of your changes ?"
OPTIONS="Yes No Quit"
select opt in $OPTIONS; do
    clear
    if [ "$opt" == "Quit" ]; then
        exit
    elif [ "$opt" == "Yes" ]; then
        rm $file
        mv "$filename-segmented.$extension" $file
        break
    elif [ "$opt" == "No" ]; then
        break
    else
        clear
        echo -e "Bad option\n"
    fi
done
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