How to set FPS using ffmpeg
I'm trying to save my CCTV stream into segments of 300 seconds with a FPS of 7. Here's my command:
ffmpeg -r 7 -i rtsp://192.168.1.100/...stream=0.sdp -acodec aac -strict -2 -vcodec copy -f segment -segment_time 300 -segment_format mp4 "mon1-%03d.mp4"
The output file doesn't seem to respect the '-r 7' command (for FPS = 7). Does anyone know how to set the FPS of the output?
ffmpeg libav fps
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
asked Jun 3 '17 at 10:56
John M.
10817
add a comment |
I'm trying to save my CCTV stream into segments of 300 seconds with a FPS of 7. Here's my command:
ffmpeg -r 7 -i rtsp://192.168.1.100/...stream=0.sdp -acodec aac -strict -2 -vcodec copy -f segment -segment_time 300 -segment_format mp4 "mon1-%03d.mp4"
The output file doesn't seem to respect the '-r 7' command (for FPS = 7). Does anyone know how to set the FPS of the output?
ffmpeg libav fps
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
asked Jun 3 '17 at 10:56
John M.
10817
add a comment |
I'm trying to save my CCTV stream into segments of 300 seconds with a FPS of 7. Here's my command:
ffmpeg -r 7 -i rtsp://192.168.1.100/...stream=0.sdp -acodec aac -strict -2 -vcodec copy -f segment -segment_time 300 -segment_format mp4 "mon1-%03d.mp4"
The output file doesn't seem to respect the '-r 7' command (for FPS = 7). Does anyone know how to set the FPS of the output?
ffmpeg libav fps
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
asked Jun 3 '17 at 10:56
John M.
10817
I'm trying to save my CCTV stream into segments of 300 seconds with a FPS of 7. Here's my command:
ffmpeg -r 7 -i rtsp://192.168.1.100/...stream=0.sdp -acodec aac -strict -2 -vcodec copy -f segment -segment_time 300 -segment_format mp4 "mon1-%03d.mp4"
The output file doesn't seem to respect the '-r 7' command (for FPS = 7). Does anyone know how to set the FPS of the output?
ffmpeg libav fps
ffmpeg libav fps
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
asked Jun 3 '17 at 10:56
John M.
10817
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
asked Jun 3 '17 at 10:56
John M.
10817
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
edited Jun 3 '17 at 20:41
JakeGould
30.9k1093137
30.9k1093137
asked Jun 3 '17 at 10:56
John M.
10817
asked Jun 3 '17 at 10:56
John M.
10817
asked Jun 3 '17 at 10:56
John M.
10817
10817
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
When you put an argument before -i, it will be applied to the following input only.
Move the -r argument somewhere between the input and output file.
In your case, the frame rate is not changed, since you only copy the video bitstream. When changing the frame rate, you have to re-encode the video, since dropping frames means that inter-frame predictions will no longer be valid.
answered Jun 3 '17 at 12:54
slhck
159k47440464
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
@slhck - with containers that have timestamps, inputrdoes not alter PTS intervals in copy mode. Works with raw bitstreams.
– Gyan
Jun 3 '17 at 13:04
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.-crf 23).
– slhck
Jun 3 '17 at 20:29
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
When you put an argument before -i, it will be applied to the following input only.
Move the -r argument somewhere between the input and output file.
In your case, the frame rate is not changed, since you only copy the video bitstream. When changing the frame rate, you have to re-encode the video, since dropping frames means that inter-frame predictions will no longer be valid.
answered Jun 3 '17 at 12:54
slhck
159k47440464
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
@slhck - with containers that have timestamps, inputrdoes not alter PTS intervals in copy mode. Works with raw bitstreams.
– Gyan
Jun 3 '17 at 13:04
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.-crf 23).
– slhck
Jun 3 '17 at 20:29
add a comment |
When you put an argument before -i, it will be applied to the following input only.
Move the -r argument somewhere between the input and output file.
In your case, the frame rate is not changed, since you only copy the video bitstream. When changing the frame rate, you have to re-encode the video, since dropping frames means that inter-frame predictions will no longer be valid.
answered Jun 3 '17 at 12:54
slhck
159k47440464
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
@slhck - with containers that have timestamps, inputrdoes not alter PTS intervals in copy mode. Works with raw bitstreams.
– Gyan
Jun 3 '17 at 13:04
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.-crf 23).
– slhck
Jun 3 '17 at 20:29
add a comment |
When you put an argument before -i, it will be applied to the following input only.
Move the -r argument somewhere between the input and output file.
In your case, the frame rate is not changed, since you only copy the video bitstream. When changing the frame rate, you have to re-encode the video, since dropping frames means that inter-frame predictions will no longer be valid.
answered Jun 3 '17 at 12:54
slhck
159k47440464
When you put an argument before -i, it will be applied to the following input only.
Move the -r argument somewhere between the input and output file.
In your case, the frame rate is not changed, since you only copy the video bitstream. When changing the frame rate, you have to re-encode the video, since dropping frames means that inter-frame predictions will no longer be valid.
answered Jun 3 '17 at 12:54
slhck
159k47440464
edited Jun 3 '17 at 20:27
answered Jun 3 '17 at 12:54
slhck
159k47440464
answered Jun 3 '17 at 12:54
slhck
159k47440464
answered Jun 3 '17 at 12:54
slhck
159k47440464
159k47440464
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
@slhck - with containers that have timestamps, inputrdoes not alter PTS intervals in copy mode. Works with raw bitstreams.
– Gyan
Jun 3 '17 at 13:04
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.-crf 23).
– slhck
Jun 3 '17 at 20:29
add a comment |
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
@slhck - with containers that have timestamps, inputrdoes not alter PTS intervals in copy mode. Works with raw bitstreams.
– Gyan
Jun 3 '17 at 13:04
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.-crf 23).
– slhck
Jun 3 '17 at 20:29
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
I've tried putting it in front of the filename, but the output fps is still 20.
– John M.
Jun 3 '17 at 12:55
@slhck - with containers that have timestamps, input
r does not alter PTS intervals in copy mode. Works with raw bitstreams.– Gyan
Jun 3 '17 at 13:04
@slhck - with containers that have timestamps, input
r does not alter PTS intervals in copy mode. Works with raw bitstreams.– Gyan
Jun 3 '17 at 13:04
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@Mulvya Didn't see the copy in the OP's question, of course you're right.
– slhck
Jun 3 '17 at 20:25
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.
-crf 23).– slhck
Jun 3 '17 at 20:29
@John It seems you have to re-encode the video, as you can't just arbitrarily change the FPS. Remove the copy option and set some quality parameter for the output (e.g.
-crf 23).– slhck
Jun 3 '17 at 20:29
add a comment |
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