Is it possible to speed up video with audio using ffmpeg, without changing audio pitch?
Is there a relatively simple way to speed up a video (mp4, with aac encoded audio), by say "x1.25" or "x1.3" while keeping the original audio-video sync, but also retaining the original pitch of the audio ?
I've read some discussions about extracting audio track into separate file, then use rubberband to lower the pitch by the requisite value, and then merge the audio video tracks using ffmpeg with speed-up, which raises the pitch of the audio back again to original. However, it appears that this is a bit of hit-n-miss, because rubberband appears to use number of octaves as the parameter to raise or lower pitch, and this may not always align perfectly with the video, as musical notes / octaves have specific ratios. Also, this is cumbersome.
So, is there any simpler ways using ffmpeg alone ?
audio video ffmpeg
asked May 21 '18 at 2:37
icarus74icarus74
1781211
add a comment |
Is there a relatively simple way to speed up a video (mp4, with aac encoded audio), by say "x1.25" or "x1.3" while keeping the original audio-video sync, but also retaining the original pitch of the audio ?
I've read some discussions about extracting audio track into separate file, then use rubberband to lower the pitch by the requisite value, and then merge the audio video tracks using ffmpeg with speed-up, which raises the pitch of the audio back again to original. However, it appears that this is a bit of hit-n-miss, because rubberband appears to use number of octaves as the parameter to raise or lower pitch, and this may not always align perfectly with the video, as musical notes / octaves have specific ratios. Also, this is cumbersome.
So, is there any simpler ways using ffmpeg alone ?
audio video ffmpeg
asked May 21 '18 at 2:37
icarus74icarus74
1781211
1
rubberband offers a tempo option which takes in a decimal number.
– Gyan
May 21 '18 at 6:03
Thanks @Gyan. Sounds like a valid answer, even if it is not as simple as I'd hope it to be, but removes the issue ofrubberbandbeing (wrongly presumed to be) limited to pitch change based on number of notes (of a chromatic scale).
– icarus74
May 21 '18 at 6:20
1
rubberband can be compiled as a ffmpeg filter, so no need to extract audio.
– Gyan
May 21 '18 at 6:42
add a comment |
Is there a relatively simple way to speed up a video (mp4, with aac encoded audio), by say "x1.25" or "x1.3" while keeping the original audio-video sync, but also retaining the original pitch of the audio ?
I've read some discussions about extracting audio track into separate file, then use rubberband to lower the pitch by the requisite value, and then merge the audio video tracks using ffmpeg with speed-up, which raises the pitch of the audio back again to original. However, it appears that this is a bit of hit-n-miss, because rubberband appears to use number of octaves as the parameter to raise or lower pitch, and this may not always align perfectly with the video, as musical notes / octaves have specific ratios. Also, this is cumbersome.
So, is there any simpler ways using ffmpeg alone ?
audio video ffmpeg
asked May 21 '18 at 2:37
icarus74icarus74
1781211
Is there a relatively simple way to speed up a video (mp4, with aac encoded audio), by say "x1.25" or "x1.3" while keeping the original audio-video sync, but also retaining the original pitch of the audio ?
I've read some discussions about extracting audio track into separate file, then use rubberband to lower the pitch by the requisite value, and then merge the audio video tracks using ffmpeg with speed-up, which raises the pitch of the audio back again to original. However, it appears that this is a bit of hit-n-miss, because rubberband appears to use number of octaves as the parameter to raise or lower pitch, and this may not always align perfectly with the video, as musical notes / octaves have specific ratios. Also, this is cumbersome.
So, is there any simpler ways using ffmpeg alone ?
audio video ffmpeg
audio video ffmpeg
asked May 21 '18 at 2:37
icarus74icarus74
1781211
asked May 21 '18 at 2:37
icarus74icarus74
1781211
asked May 21 '18 at 2:37
icarus74icarus74
1781211
asked May 21 '18 at 2:37
icarus74icarus74
1781211
asked May 21 '18 at 2:37
icarus74icarus74
1781211
1781211
1
rubberband offers a tempo option which takes in a decimal number.
– Gyan
May 21 '18 at 6:03
Thanks @Gyan. Sounds like a valid answer, even if it is not as simple as I'd hope it to be, but removes the issue ofrubberbandbeing (wrongly presumed to be) limited to pitch change based on number of notes (of a chromatic scale).
– icarus74
May 21 '18 at 6:20
1
rubberband can be compiled as a ffmpeg filter, so no need to extract audio.
– Gyan
May 21 '18 at 6:42
add a comment |
1
rubberband offers a tempo option which takes in a decimal number.
– Gyan
May 21 '18 at 6:03
Thanks @Gyan. Sounds like a valid answer, even if it is not as simple as I'd hope it to be, but removes the issue ofrubberbandbeing (wrongly presumed to be) limited to pitch change based on number of notes (of a chromatic scale).
– icarus74
May 21 '18 at 6:20
1
rubberband can be compiled as a ffmpeg filter, so no need to extract audio.
– Gyan
May 21 '18 at 6:42
1
1
rubberband offers a tempo option which takes in a decimal number.
– Gyan
May 21 '18 at 6:03
rubberband offers a tempo option which takes in a decimal number.
– Gyan
May 21 '18 at 6:03
Thanks @Gyan. Sounds like a valid answer, even if it is not as simple as I'd hope it to be, but removes the issue of
rubberband being (wrongly presumed to be) limited to pitch change based on number of notes (of a chromatic scale).– icarus74
May 21 '18 at 6:20
Thanks @Gyan. Sounds like a valid answer, even if it is not as simple as I'd hope it to be, but removes the issue of
rubberband being (wrongly presumed to be) limited to pitch change based on number of notes (of a chromatic scale).– icarus74
May 21 '18 at 6:20
1
1
rubberband can be compiled as a ffmpeg filter, so no need to extract audio.
– Gyan
May 21 '18 at 6:42
rubberband can be compiled as a ffmpeg filter, so no need to extract audio.
– Gyan
May 21 '18 at 6:42
add a comment |
1 Answer
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It can be done with ffmpgeg using a complex filter:
ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv
Doku: https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
add a comment |
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It can be done with ffmpgeg using a complex filter:
ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv
Doku: https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
add a comment |
It can be done with ffmpgeg using a complex filter:
ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv
Doku: https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
add a comment |
It can be done with ffmpgeg using a complex filter:
ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv
Doku: https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
It can be done with ffmpgeg using a complex filter:
ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv
Doku: https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
answered Jan 15 at 22:08
WeidenrindeWeidenrinde
1412
1412
add a comment |
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1
rubberband offers a tempo option which takes in a decimal number.
– Gyan
May 21 '18 at 6:03
Thanks @Gyan. Sounds like a valid answer, even if it is not as simple as I'd hope it to be, but removes the issue of
rubberbandbeing (wrongly presumed to be) limited to pitch change based on number of notes (of a chromatic scale).– icarus74
May 21 '18 at 6:20
1
rubberband can be compiled as a ffmpeg filter, so no need to extract audio.
– Gyan
May 21 '18 at 6:42