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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.

• How can I automatically embed commit information into a subtitles file that I'm tracking ?

  23 février 2015, par microspace

  I use git to track *.ass subtitle files.
  Here is example of *.ass file :

  [Script Info]
  
  ; Script generated by Aegisub 3.1.2
  
  ; http://www.aegisub.org/
  
  Title: Default Aegisub file
  
  ScriptType: v4.00+
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour,    BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1
  
  Style: titr,DejaVu     
  
  
  
  Sans,20,&H007DDBFA,&H000000FF,&H00000000,&HFF000000,0,0,0,0,100,100,0,0,1,2,2,1,10,10,10,1
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,0:00:00.46,0:00:11.22,Default,,0,0,0,,Если это можно было бы
  
  Dialogue: 0,0:00:03.44,0:00:08.96,titr,,0,0,0,,{\pos(20,240)\fad(600,600)}бывший министр

  After commit I burn subtitles into video :

  ffmpeg -i video.avi -vf "ass=subtitle.ass" out.avi

  My goal is to show commit date for 10 second at the start of movie. This should be done automatically.

  1) It can be easily done with by modifying subtitle.ass itself, but I can’t do it after commit and there are other reasons.

  2) It can be done by ffmpeg from command line : How to use ffmpeg to add a text to avi video ?

  Problem is that in this case text will be shown for the whole lenght of movie.

  3) I can copy *.ass file to temporary directory, insert date, render and delete *.ass file.

  Is there a simpler way ?