How to cut up a video into uniform parts using a command line tool
I want to use a command line tool to cut up a video according to a specific interval, say 1 second. If I have a 60 second video, I expect it to be split up into 60 uniform parts. My only other requirement is that there be no re-encoding.
I've read two threads on this topic (1, 2). The 1st thread suggested an untrusted tool that no longer seems to be maintained. The 2nd thread suggested avconv to manipulate large segments of video with manual names. As I'll be cutting up these videos into potentially hundreds of smaller parts, the approach is far too tedious. One user offered a Bash script, but admitted this might "produce many errors and empty files". I'll repost this script here for clarity and to encourage a better solution:
#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "nb")
FILES=$(ls *.mp4|sort)
let START=0
for FILE in $FILES
do
echo Processing $FILE
mkdir "${FILE}-chop"
for COUNT in {1..59}
do
exec avconv -i "${FILE}" -ss $START -t 60 -c:v copy -c:a copy "./${FILE}-chop/${COUNT} - ${FILE}"
let START=$START+60
done
done
IFS=$SAVEIFS
Is a Bash script like this really the right approach here? Or is there a simpler, more efficient, more reliable tool that I can use for this purpose?
command-line bash scripts ffmpeg avconv
asked Feb 8 at 21:04
LichtungLichtung
133
add a comment |
I want to use a command line tool to cut up a video according to a specific interval, say 1 second. If I have a 60 second video, I expect it to be split up into 60 uniform parts. My only other requirement is that there be no re-encoding.
I've read two threads on this topic (1, 2). The 1st thread suggested an untrusted tool that no longer seems to be maintained. The 2nd thread suggested avconv to manipulate large segments of video with manual names. As I'll be cutting up these videos into potentially hundreds of smaller parts, the approach is far too tedious. One user offered a Bash script, but admitted this might "produce many errors and empty files". I'll repost this script here for clarity and to encourage a better solution:
#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "nb")
FILES=$(ls *.mp4|sort)
let START=0
for FILE in $FILES
do
echo Processing $FILE
mkdir "${FILE}-chop"
for COUNT in {1..59}
do
exec avconv -i "${FILE}" -ss $START -t 60 -c:v copy -c:a copy "./${FILE}-chop/${COUNT} - ${FILE}"
let START=$START+60
done
done
IFS=$SAVEIFS
Is a Bash script like this really the right approach here? Or is there a simpler, more efficient, more reliable tool that I can use for this purpose?
command-line bash scripts ffmpeg avconv
asked Feb 8 at 21:04
LichtungLichtung
133
add a comment |
I want to use a command line tool to cut up a video according to a specific interval, say 1 second. If I have a 60 second video, I expect it to be split up into 60 uniform parts. My only other requirement is that there be no re-encoding.
I've read two threads on this topic (1, 2). The 1st thread suggested an untrusted tool that no longer seems to be maintained. The 2nd thread suggested avconv to manipulate large segments of video with manual names. As I'll be cutting up these videos into potentially hundreds of smaller parts, the approach is far too tedious. One user offered a Bash script, but admitted this might "produce many errors and empty files". I'll repost this script here for clarity and to encourage a better solution:
#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "nb")
FILES=$(ls *.mp4|sort)
let START=0
for FILE in $FILES
do
echo Processing $FILE
mkdir "${FILE}-chop"
for COUNT in {1..59}
do
exec avconv -i "${FILE}" -ss $START -t 60 -c:v copy -c:a copy "./${FILE}-chop/${COUNT} - ${FILE}"
let START=$START+60
done
done
IFS=$SAVEIFS
Is a Bash script like this really the right approach here? Or is there a simpler, more efficient, more reliable tool that I can use for this purpose?
command-line bash scripts ffmpeg avconv
asked Feb 8 at 21:04
LichtungLichtung
133
I want to use a command line tool to cut up a video according to a specific interval, say 1 second. If I have a 60 second video, I expect it to be split up into 60 uniform parts. My only other requirement is that there be no re-encoding.
I've read two threads on this topic (1, 2). The 1st thread suggested an untrusted tool that no longer seems to be maintained. The 2nd thread suggested avconv to manipulate large segments of video with manual names. As I'll be cutting up these videos into potentially hundreds of smaller parts, the approach is far too tedious. One user offered a Bash script, but admitted this might "produce many errors and empty files". I'll repost this script here for clarity and to encourage a better solution:
#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "nb")
FILES=$(ls *.mp4|sort)
let START=0
for FILE in $FILES
do
echo Processing $FILE
mkdir "${FILE}-chop"
for COUNT in {1..59}
do
exec avconv -i "${FILE}" -ss $START -t 60 -c:v copy -c:a copy "./${FILE}-chop/${COUNT} - ${FILE}"
let START=$START+60
done
done
IFS=$SAVEIFS
Is a Bash script like this really the right approach here? Or is there a simpler, more efficient, more reliable tool that I can use for this purpose?
command-line bash scripts ffmpeg avconv
command-line bash scripts ffmpeg avconv
asked Feb 8 at 21:04
LichtungLichtung
133
asked Feb 8 at 21:04
LichtungLichtung
133
asked Feb 8 at 21:04
LichtungLichtung
133
asked Feb 8 at 21:04
LichtungLichtung
133
asked Feb 8 at 21:04
LichtungLichtung
133
133
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Use the segment muxer in ffmpeg:
ffmpeg -i input -map 0 -f segment -segment_time 60 -reset_timestamps 1 -c copy output_%03d.mp4
Using -c copy enables stream copy mode. The segment muxer will cut on keyframes when stream copying, so the segments may not have an exact duration of 60 seconds. If you need exactly 60 seconds per segment then you will need to re-encode by removing -c copy and setting an appropriate GOP size to fit your segment time constraint. For example, a one second GOP for a 25 framerate output is -g 25 (default is 250).
answered Feb 11 at 19:37
lloganllogan
5,1701536
This works almost perfectly, except thesegment_timedoesn't seem to allow less than 5 seconds per segment. I've triedsegment_time 1andsegment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.
– Lichtung
Feb 11 at 23:31
@Introspectre Did you try without-c copy?
– llogan
Feb 11 at 23:38
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
@Introspectre Add-g 25(and omit-c copy).
– llogan
Feb 12 at 0:24
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use the segment muxer in ffmpeg:
ffmpeg -i input -map 0 -f segment -segment_time 60 -reset_timestamps 1 -c copy output_%03d.mp4
Using -c copy enables stream copy mode. The segment muxer will cut on keyframes when stream copying, so the segments may not have an exact duration of 60 seconds. If you need exactly 60 seconds per segment then you will need to re-encode by removing -c copy and setting an appropriate GOP size to fit your segment time constraint. For example, a one second GOP for a 25 framerate output is -g 25 (default is 250).
answered Feb 11 at 19:37
lloganllogan
5,1701536
This works almost perfectly, except thesegment_timedoesn't seem to allow less than 5 seconds per segment. I've triedsegment_time 1andsegment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.
– Lichtung
Feb 11 at 23:31
@Introspectre Did you try without-c copy?
– llogan
Feb 11 at 23:38
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
@Introspectre Add-g 25(and omit-c copy).
– llogan
Feb 12 at 0:24
add a comment |
Use the segment muxer in ffmpeg:
ffmpeg -i input -map 0 -f segment -segment_time 60 -reset_timestamps 1 -c copy output_%03d.mp4
Using -c copy enables stream copy mode. The segment muxer will cut on keyframes when stream copying, so the segments may not have an exact duration of 60 seconds. If you need exactly 60 seconds per segment then you will need to re-encode by removing -c copy and setting an appropriate GOP size to fit your segment time constraint. For example, a one second GOP for a 25 framerate output is -g 25 (default is 250).
answered Feb 11 at 19:37
lloganllogan
5,1701536
This works almost perfectly, except thesegment_timedoesn't seem to allow less than 5 seconds per segment. I've triedsegment_time 1andsegment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.
– Lichtung
Feb 11 at 23:31
@Introspectre Did you try without-c copy?
– llogan
Feb 11 at 23:38
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
@Introspectre Add-g 25(and omit-c copy).
– llogan
Feb 12 at 0:24
add a comment |
Use the segment muxer in ffmpeg:
ffmpeg -i input -map 0 -f segment -segment_time 60 -reset_timestamps 1 -c copy output_%03d.mp4
Using -c copy enables stream copy mode. The segment muxer will cut on keyframes when stream copying, so the segments may not have an exact duration of 60 seconds. If you need exactly 60 seconds per segment then you will need to re-encode by removing -c copy and setting an appropriate GOP size to fit your segment time constraint. For example, a one second GOP for a 25 framerate output is -g 25 (default is 250).
answered Feb 11 at 19:37
lloganllogan
5,1701536
Use the segment muxer in ffmpeg:
ffmpeg -i input -map 0 -f segment -segment_time 60 -reset_timestamps 1 -c copy output_%03d.mp4
Using -c copy enables stream copy mode. The segment muxer will cut on keyframes when stream copying, so the segments may not have an exact duration of 60 seconds. If you need exactly 60 seconds per segment then you will need to re-encode by removing -c copy and setting an appropriate GOP size to fit your segment time constraint. For example, a one second GOP for a 25 framerate output is -g 25 (default is 250).
answered Feb 11 at 19:37
lloganllogan
5,1701536
edited Feb 12 at 0:23
answered Feb 11 at 19:37
lloganllogan
5,1701536
answered Feb 11 at 19:37
lloganllogan
5,1701536
answered Feb 11 at 19:37
lloganllogan
5,1701536
5,1701536
This works almost perfectly, except thesegment_timedoesn't seem to allow less than 5 seconds per segment. I've triedsegment_time 1andsegment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.
– Lichtung
Feb 11 at 23:31
@Introspectre Did you try without-c copy?
– llogan
Feb 11 at 23:38
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
@Introspectre Add-g 25(and omit-c copy).
– llogan
Feb 12 at 0:24
add a comment |
This works almost perfectly, except thesegment_timedoesn't seem to allow less than 5 seconds per segment. I've triedsegment_time 1andsegment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.
– Lichtung
Feb 11 at 23:31
@Introspectre Did you try without-c copy?
– llogan
Feb 11 at 23:38
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
@Introspectre Add-g 25(and omit-c copy).
– llogan
Feb 12 at 0:24
This works almost perfectly, except the
segment_time doesn't seem to allow less than 5 seconds per segment. I've tried segment_time 1 and segment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.– Lichtung
Feb 11 at 23:31
This works almost perfectly, except the
segment_time doesn't seem to allow less than 5 seconds per segment. I've tried segment_time 1 and segment_time 0.1, but the output is always a minimum of 5 seconds. The ffmpeg manual doesn't appear to explain this inconsistency.– Lichtung
Feb 11 at 23:31
@Introspectre Did you try without
-c copy?– llogan
Feb 11 at 23:38
@Introspectre Did you try without
-c copy?– llogan
Feb 11 at 23:38
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
Tried it just now, but it's the same duration, unfortunately.
– Lichtung
Feb 11 at 23:56
@Introspectre Add
-g 25 (and omit -c copy).– llogan
Feb 12 at 0:24
@Introspectre Add
-g 25 (and omit -c copy).– llogan
Feb 12 at 0:24
add a comment |
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