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  23. 31 Jan, 2013 2 commits
    • Giorgio Vazzana's avatar
      lavd/v4l2: read the correct time per frame from devices that support a standard · 514216d8
      Giorgio Vazzana authored
      Generally speaking, there are two types of v4l2 devices [1]:
      
      1) devices that support a standard, like PAL or NTFS (tv cards, for example). For
      this class of devices the framerate is fixed by the standard (for example PAL uses
      25 fps) and the v4l2 driver cannot usually negotiate a different framerate (unless
      it can skip frames on the driver side, to save I/O bandwidth).
      
      2) devices for which the notion of standard does not make sense (webcams, for example).
      For these devices it is usually possibile to request a desidered framerate.
      
      In either case, the desidered frame rate can be requested when the VIDIOC_G_PARM
      ioctl returns the V4L2_CAP_TIMEPERFRAME flag in the capability field.
      
      Currently the code does not check for V4L2_CAP_TIMEPERFRAME and supports only the
      second category of devices, returning a time per frame of 0/0 for devices in the
      first group that do not permit to negotiate the framerate.
      
      This patch adds support to read the correct framerate in all cases.
      
      [1] http://linuxtv.org/downloads/v4l-dvb-apis/standard.htmlSigned-off-by: 's avatarStefano Sabatini <stefasab@gmail.com>
      514216d8
    • Giorgio Vazzana's avatar
      lavd/v4l2: add list_standards option · ff23b768
      Giorgio Vazzana authored
      Since the user is expected to choose the standard by name (with -standard
      option), add the possibility to list all the supported standards.
      Signed-off-by: 's avatarStefano Sabatini <stefasab@gmail.com>
      ff23b768
  24. 27 Jan, 2013 3 commits
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  26. 16 Jan, 2013 3 commits