non monotonically increasing

[passtschu]

Summary of the bug:
non monotonically increasing while muxing rtsp stream

How to reproduce:

ffmpeg -y -i 'rtsp://a1966.v1252936.c125293.g.vq.akamaistream.net/7/1966/125293/v0001/mp4.od.origin.zdf.de.gl-systemhaus.de/none/zdf/13/06/130610_querschuss_ps_sok1_1596k_p13v9.mp4' -acod
ec copy -vcodec copy '/path/to/file.mp4' -v info
ffmpeg version 0.10.6 Copyright (c) 2000-2012 the FFmpeg developers
  built on May 14 2013 10:45:00 with gcc 4.7.3
  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, rtsp, from 'rtsp://a1966.v1252936.c125293.g.vq.akamaistream.net/7/1966/125293/v0001/mp4.od.origin.zdf.de.gl-systemhaus.de/none/zdf/13/06/130610_querschuss_ps_sok1_1596k_p13v9.mp4':
  Metadata:
    title           : /7/1966/125293/v0001/mp4.od.origin.zdf.de.gl-systemhaus.de/none/zdf/13/06/130610_querschuss_ps_sok1_1596k_p13v9.mp4
  Duration: 00:43:02.61, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Main), yuv420p, 852x480 [SAR 1:1 DAR 71:40], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1: Audio: aac, 48000 Hz, stereo, s16
Output #0, mp4, to '/storage/tmp/SOKO_5113/Querschuss.mp4':
  Metadata:
    title           : /7/1966/125293/v0001/mp4.od.origin.zdf.de.gl-systemhaus.de/none/zdf/13/06/130610_querschuss_ps_sok1_1596k_p13v9.mp4
    encoder         : Lavf53.32.100
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 852x480 [SAR 1:1 DAR 71:40], q=2-31, 25 fps, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (@[0][0][0] / 0x0040), 48000 Hz, stereo
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Application provided invalid, non monotonically increasing dts to muxer in stream 0: 74296980 >= 74196000
av_interleaved_write_frame(): Invalid argument

Same problem with rtsp://a1966.v1252936.c125293.g.vq.akamaistream.net/7/1966/125293/v0001/mp4.od.origin.zdf.de.gl-systemhaus.de/none/zdf/13/06/130611_endstation_mord_ps_sok3_1596k_p13v9.mp4 and others.

[Carl Eugen Hoyos]

Please test current git head.