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• lavf/qsv_scale : add scaling modes support

  18 juin 2019, par Zhong Li

  lavf/qsv_scale : add scaling modes support
  low_power mode will use a fixed HW engine (SFC), thus can offload EU usage.
  
  high quality mode will take EU usage (AVS sampler).
  Performance and EU usage (Render usage) comparsion on Intel(R) Xeon(R) CPU E3-1225 v5 @ 3.30GHz :
  High quality mode : ffmpeg -hwaccel qsv -c:v h264_qsv -i bbb_sunflower_1080p_30fps_normal_2000frames.h264 \
  
   vf scale_qsv=w=1280:h=736:mode=hq -f null -
  
  fps=389
  
  RENDER usage : 28.10 (provided by MSDK metrics_monitor)
  Low Power mode : ffmpeg -hwaccel qsv -c:v h264_qsv -i /bbb_sunflower_1080p_30fps_normal_2000frames.h264 \
  
   vf scale_qsv=w=1280:h=736:mode=low_power -f null -
  
  fps=343
  
  RENDER usage : 0.00
  Low power mode (SFC) may be disabled if not supported by
  
  MSDK/Driver/HW, and replaced by AVS mode interanlly.
  Signed-off-by : Zhong Li <zhong.li@intel.com>
  

  • [DH] libavfilter/vf_scale_qsv.c

• Integrate FFmpeg on iOS [on hold]

  11 décembre 2018, par Caleb

  I have referred links, still I have confusion. If any one has an idea then please share with me.
I am searching to implement FFmpeg on iOS for GIF , as like the example given for android, 


  Please refer this =>
  https://medium.com/wolox-driving-innovation/https-medium-com-wolox-driving-innovation-the-power-of-ffmpeg-on-android-ef6e0c01d59f


  I have referred these links,

  
https://github.com/DeviLeo/DLGPlayer


  https://github.com/ElfSundae/FFmpeg-iOS-build


  https://github.com/kewlbear/FFmpeg-iOS-build-script

  

what is the correct way to achieve this.
Any help would be highly appreciated.

• Synchronization Error in Gstreamer/H264 encoding

  21 juin 2020, par Ryan

  Trying to produce a frame synced recording platform w/multiple sensors all capturing at the same fps.

  


  Currently can get up to 8 usb cameras streaming and capturing h264 files. These files are reporting same durations, same number of frames, same frame rate etc. I am experiencing some drift in the videos however.

  


  I assume I am not able to write frames to disk fast enough and this results in the shift. However what I do not understand what is 'masking' this, and why it would report the same nb_frames and durations even though real world time is clearly different. The shift can be relatively minor (5-10 frames over 2 minutes) or more extreme (20-30). But what I am looking for is a multicam frame level sync. So each video can produce the exact same frame and a given timestamp.

  


  I know there are many elements at play here. What I'm looking for first is a better understanding of what my exact problem may be and how I can understand it.