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• Making a blu-ray video-album from 30fps video-recordings ?

  11 janvier 2015, par mr_lou

  I wish to make a blu-ray video-album with all the family video-recordings I’ve done with various recording devices through-up the years. Most of the recordings are 720p 30fps, recorded with my cellphone.

  As many others before me I have now learned, that simply saving my video-project as a 720p 24fps rendering, results in a lot of jerkiness due to the missing frames. Not good.

  But what to do then ?

  According to http://en.wikipedia.org/wiki/Blu-ray_Disc#Media_format my other framerate options for 720p are 60fps (59.94fps) or 50fps. So as I’m writing this I’m trying to render my project into a 59.94fps video. Logically, if my recordings have 30fps, there’ll be a little jerkiness here too though ?

  Another option I seem to have, is to save my project as a 1080i 29.97fps video. This is as close to the 30fps I can get, but again : 29.97fps isn’t 30fps, so what happens with jerkiness here ?

  Also, saving my 720p 30fps recordings as either 720p 59.94fps or 1080i 29.97fps logically results in a bigger filesize. Filesize is somewhat important too, as I expect this blu-ray collection to contain as many videos as possible. (720p recordings should give at least 11 hours on a standard 25gb blu-ray disc).

  And finally, there’s also the theoretical option of converting my 30fps recordings to smooth 24fps recordings, but as far as I can understand in my searches, this is extremely tricky / almost impossible to do ?

  Surely it can’t be this tricky to put everyday recordings onto a blu-ray disc ? I must be missing something ?

  The overall question is : What is the best solution for putting 720p 30fps and 1080p 30fps video-recordings onto a blu-ray disc ?

  Thanks !

  EDIT :

  Two possible answers I’m expecting to hear :

  1) Best practice to put 720p 30fps and 1080p 30fps videos onto a blu-ray, is to just stick to 720p 30fps and 1080p 30fps. Although it is not a blu-ray standard, the majority of players will play them anyway.

  2) Best practice is to use 720p 59.94fps. That’s the only way to make sure the video plays on most devices. There are simply too many devices that will only play the blu-ray standards. So you can forget about using anything else.

• Revision ed2dc59c1b : Integral projection based motion estimation This commit introduces a new block

  13 février 2015, par Jingning Han

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/vp9_avg.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/x86/vp9_avg_intrin_sse2.c

  
  
  Integral projection based motion estimation

  This commit introduces a new block match motion estimation
  using integral projection measurement. The 2-D block and the nearby
  region is projected onto the horizontal and vertical 1-D vectors,
  respectively. It then runs vector match, instead of block match,
  over the two separate 1-D vectors to locate the motion compensated
  reference block.

  This process is run per 64x64 block to align the reference before
  choosing partitioning in speed 6. The overall CPU cycle cost due
  to this additional 64x64 block match (SSE2 version) takes around 2%
  at low bit-rate rtc speed 6. When strong motion activities exist in
  the video sequence, it substantially improves the partition
  selection accuracy, thereby achieving better compression performance
  and lower CPU cycles.

  The experiments were tested in RTC speed -6 setting :
  cloud 1080p 500 kbps
  17006 b/f, 37.086 dB, 5386 ms ->
  16669 b/f, 37.970 dB, 5085 ms (>0.9dB gain and 6% faster)

  pedestrian_area 1080p 500 kbps
  53537 b/f, 36.771 dB, 18706 ms ->
  51897 b/f, 36.792 dB, 18585 ms (4% bit-rate savings)

  blue_sky 1080p 500 kbps
  70214 b/f, 33.600 dB, 13979 ms ->
  53885 b/f, 33.645 dB, 10878 ms (30% bit-rate savings, 25% faster)

  jimred 400 kbps
  13380 b/f, 36.014 dB, 5723 ms ->
  13377 b/f, 36.087 dB, 5831 ms (2% bit-rate savings, 2% slower)

  Change-Id : Iffdb6ea5b16b77016bfa3dd3904d284168ae649c

• FFMPEG : Encoding settings to meet YouTube recommendation.

  1er novembre 2016, par Dinindu Perera

  So I need to encode to meet these guidelines from YouTube for 480p and 1080p videos. I need help in the settings of FFMPEG. The video should encode reasonably fast.

  These are the guidelines :
  480p 30fps x264
  

  • Video Bitrate : 2560 kbps
  • Audio Bitrate : 384 kbps

  1080p 30fps x264
  

  • Video Bitrate : 8192 kbps
  • Audio Bitrate : 384 kbps

  I’m still learning the ropes with video encoding. Thanks in advance :)