[FFmpeg-trac] #3328(undetermined:new): video "judder" issue noted after DVR-MS to MP4 conversion

FFmpeg trac at avcodec.org
Tue Jan 21 13:46:26 CET 2014

#3328: video "judder" issue noted after DVR-MS to MP4 conversion
             Reporter:  beteljuice   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by beteljuice):

 Using ffmpeg w/ git 633b90c, I found that the resulting output (as an .avi
 file) played back properly with no judder. However, I did note the
 following when playing back the files using Windows Media Player 11:

 - the audio on the .avi was quieter than the .dvr-ms (had to increase the
 volume to compensate)
 - Using MediaInfo to evaluate the properties of each file, I found that
 both files showed a resolution of 720x480 and an aspect ratio of 16:9.
 However, the video stream for the .avi reported 59.940 fps, while the
 .dvr-ms reported 23.976fps.
 - When playing the files in fullscreen, the height of the black bars above
 and below the .avi was less than the height of the black bars for the
 .dvr-ms. As an example: the spinning globe at the beginning of the .dvr-ms
 file is perfectly round, while the globe in the .avi file is oval (left
 and right sides of the globe pressed inwards).

 Are these expected side effects of the test?

Ticket URL: <https://trac.ffmpeg.org/ticket/3328#comment:10>
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