[FFmpeg-trac] #4101(undetermined:new): segment option creates continually longer files

[FFmpeg]

#4101: segment option creates continually longer files
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             Reporter:  illumilore   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 When running:
 ./ffmpeg -f video4linux2 -input_format mjpeg -s 960x720 -r 5 -strict -2 -i
 /dev/video0 http://127.0.0.1:8090/cam.ffm -map 0 -f segment -segment_time
 60 -r 5 -s 640x480 /media/cam/testing_%04d.avi

 the video files it creates will start to become longer videos than the 60
 seconds that they each should be according to segment. When opening
 testing_0010.avi with vlc for example, it will be 11 minutes long, with
 the first 10 minutes consisting of the same frame. and then the 0011 file
 will have 11 minutes of the same image before actual video movement starts
 happening.

 $ ./ffmpeg -f video4linux2 -input_format mjpeg -s 960x720 -r 5 -strict -2
 -i /dev/video0 http://127.0.0.1:8090/cam.ffm -map 0 -f segment
 -segment_time 60 -r 5 -s 640x480 /media/cam/testing_%04d.avi
 ffmpeg version N-67516-g8c28a39 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Nov 10 2014 17:34:19 with gcc 4.8 (SUSE Linux)
   configuration:
   libavutil      54. 11.100 / 54. 11.100
   libavcodec     56. 12.100 / 56. 12.100
   libavformat    56. 12.103 / 56. 12.103
   libavdevice    56.  2.100 / 56.  2.100
   libavfilter     5.  2.103 /  5.  2.103
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  1.100 /  1.  1.100
 Input #0, video4linux2,v4l2, from '/dev/video0':
   Duration: N/A, start: 117967.621236, bitrate: N/A
     Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown),
 960x720, 0 kb/s, 5 fps, 5 tbr, 1000k tbn, 1000k tbc
 [swscaler @ 0x19977e0] deprecated pixel format used, make sure you did set
 range correctly
 [swscaler @ 0x19d4840] deprecated pixel format used, make sure you did set
 range correctly
 [swscaler @ 0x19f1120] deprecated pixel format used, make sure you did set
 range correctly
 Output #0, ffm, to 'http://127.0.0.1:8090/cam.ffm':
   Metadata:
     creation_time   : now
     encoder         : Lavf56.12.103
     Stream #0:0: Video: flv1 (flv), yuv420p, 960x720, q=5-15, 4000 kb/s, 5
 fps, 1000k tbn, 5 tbc
     Metadata:
       encoder         : Lavc56.12.100 flv
     Stream #0:1: Video: mjpeg, yuvj422p(pc), 960x720, q=1-5, 200 kb/s, 5
 fps, 1000k tbn, 5 tbc
     Metadata:
       encoder         : Lavc56.12.100 mjpeg
     Stream #0:2: Video: mjpeg, yuvj422p(pc), 480x320, q=1-5, 200 kb/s, 5
 fps, 1000k tbn, 5 tbc
     Metadata:
       encoder         : Lavc56.12.100 mjpeg
 Output #1, segment, to '/media/cam/testing_%04d.avi':
   Metadata:
     encoder         : Lavf56.12.103
     Stream #1:0: Video: mpeg4, yuv420p, 640x480, q=2-31, 200 kb/s, 5 fps,
 5 tbn, 5 tbc
     Metadata:
       encoder         : Lavc56.12.100 mpeg4
 Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> flv1 (flv))
   Stream #0:0 -> #0:1 (mjpeg (native) -> mjpeg (native))
   Stream #0:0 -> #0:2 (mjpeg (native) -> mjpeg (native))
   Stream #0:0 -> #1:0 (mjpeg (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 [mjpeg @ 0x19c3120] rc buffer underflow
     Last message repeated 1 times
 [mjpeg @ 0x19c6540] rc buffer underflow
 [mjpeg @ 0x19c3120] rc buffer underflow

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Ticket URL: <https://trac.ffmpeg.org/ticket/4101>
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