How to set FPS using ffmpeg












0














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?










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    0














    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?










    share|improve this question



























      0












      0








      0







      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?










      share|improve this question















      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






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jun 3 '17 at 20:41









      JakeGould

      30.9k1093137




      30.9k1093137










      asked Jun 3 '17 at 10:56









      John M.

      10817




      10817






















          1 Answer
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          0














          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.






          share|improve this answer























          • 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












          • @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











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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          0














          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.






          share|improve this answer























          • 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












          • @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
















          0














          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.






          share|improve this answer























          • 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












          • @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














          0












          0








          0






          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.






          share|improve this answer














          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.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Jun 3 '17 at 20:27

























          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, 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










          • @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










          • @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










          • @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


















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