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How to increase the duration of the transition effect between multiple video cuts in this ffmpeg `-filter_complex` command

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1

As instructed in Gyan's solution to this question, ffmpeg can be used to interleave two audio/video inputs with a lapse dissolve transition. For example, this command will divide each input into cut ups of 6 seconds and introduce a smooth alternating 0.5 second fade in/out between the two:

ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0][1]blend=all_expr='if(mod(trunc(T/6),2),min(1,2*(T-6*trunc(T/6))),max(0,1-2*(T-6*trunc(T/6))))*A+if(mod(trunc(T/6),2),max(0,1-2*(T-6*trunc(T/6))),min(1,2*(T-6*trunc(T/6))))*B';[0]volume='if(mod(trunc(t/6),2),min(1,2*(t-6*trunc(t/6))),max(0,1-2*(t-6*trunc(t/6))))':eval=frame[a]; [1]volume='if(mod(trunc(t/6),2),max(0,1-2*(t-6*trunc(t/6))),min(1,2*(t-6*trunc(t/6))))':eval=frame[b];[a][b]amix" output.mkv

(A similar command is in an easier to read format at the original question.)

I found I could change the duration of the video cut ups by changing the 6 variable in the above command. What I don't know is how to increase the duration of the transition effect. The command at issue doesn't use the fade video filter, but a more obtuse mathematical formulation.

I've read the manual, tested many variables in the command, and also asked a similar question several months ago. How do I increase the duration of the transition effect between multiple video cuts in the above ffmpeg -filter_complex command?

command-line scripting video ffmpeg

share|improve this question

asked 13 hours ago

LichtungLichtung

2844 bronze badges

add a comment | 

1

As instructed in Gyan's solution to this question, ffmpeg can be used to interleave two audio/video inputs with a lapse dissolve transition. For example, this command will divide each input into cut ups of 6 seconds and introduce a smooth alternating 0.5 second fade in/out between the two:

ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0][1]blend=all_expr='if(mod(trunc(T/6),2),min(1,2*(T-6*trunc(T/6))),max(0,1-2*(T-6*trunc(T/6))))*A+if(mod(trunc(T/6),2),max(0,1-2*(T-6*trunc(T/6))),min(1,2*(T-6*trunc(T/6))))*B';[0]volume='if(mod(trunc(t/6),2),min(1,2*(t-6*trunc(t/6))),max(0,1-2*(t-6*trunc(t/6))))':eval=frame[a]; [1]volume='if(mod(trunc(t/6),2),max(0,1-2*(t-6*trunc(t/6))),min(1,2*(t-6*trunc(t/6))))':eval=frame[b];[a][b]amix" output.mkv

(A similar command is in an easier to read format at the original question.)

I found I could change the duration of the video cut ups by changing the 6 variable in the above command. What I don't know is how to increase the duration of the transition effect. The command at issue doesn't use the fade video filter, but a more obtuse mathematical formulation.

I've read the manual, tested many variables in the command, and also asked a similar question several months ago. How do I increase the duration of the transition effect between multiple video cuts in the above ffmpeg -filter_complex command?

command-line scripting video ffmpeg

share|improve this question

asked 13 hours ago

LichtungLichtung

2844 bronze badges

add a comment | 

As instructed in Gyan's solution to this question, ffmpeg can be used to interleave two audio/video inputs with a lapse dissolve transition. For example, this command will divide each input into cut ups of 6 seconds and introduce a smooth alternating 0.5 second fade in/out between the two:

ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0][1]blend=all_expr='if(mod(trunc(T/6),2),min(1,2*(T-6*trunc(T/6))),max(0,1-2*(T-6*trunc(T/6))))*A+if(mod(trunc(T/6),2),max(0,1-2*(T-6*trunc(T/6))),min(1,2*(T-6*trunc(T/6))))*B';[0]volume='if(mod(trunc(t/6),2),min(1,2*(t-6*trunc(t/6))),max(0,1-2*(t-6*trunc(t/6))))':eval=frame[a]; [1]volume='if(mod(trunc(t/6),2),max(0,1-2*(t-6*trunc(t/6))),min(1,2*(t-6*trunc(t/6))))':eval=frame[b];[a][b]amix" output.mkv

(A similar command is in an easier to read format at the original question.)

I found I could change the duration of the video cut ups by changing the 6 variable in the above command. What I don't know is how to increase the duration of the transition effect. The command at issue doesn't use the fade video filter, but a more obtuse mathematical formulation.

I've read the manual, tested many variables in the command, and also asked a similar question several months ago. How do I increase the duration of the transition effect between multiple video cuts in the above ffmpeg -filter_complex command?

command-line scripting video ffmpeg

share|improve this question

asked 13 hours ago

LichtungLichtung

2844 bronze badges

share|improve this question

asked 13 hours ago

LichtungLichtung

2844 bronze badges

share|improve this question

asked 13 hours ago

LichtungLichtung

2844 bronze badges

asked 13 hours ago

LichtungLichtung

2844 bronze badges

asked 13 hours ago

LichtungLichtung

2844 bronze badges