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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.

• Realtime removal of carriage return in shell

  1er mai 2013, par Seth

  For context, I'm attempting to create a shell script that simplifies the realtime console output of ffmpeg, only displaying the current frame being encoded. My end goal is to use this information in some sort of progress indicator for batch processing.

  For those unfamiliar with ffmpeg's output, it outputs encoded video information to stdout and console information to stderr. Also, when it actually gets to displaying encode information, it uses carriage returns to keep the console screen from filling up. This makes it impossible to simply use grep and awk to capture the appropriate line and frame information.

  The first thing I've tried is replacing the carriage returns using tr :

  $ ffmpeg -i "ScreeningSchedule-1.mov" -y "test.mp4" 2>&1 | tr '\r' '\n'

  This works in that it displays realtime output to the console. However, if I then pipe that information to grep or awk or anything else, tr's output is buffered and is no longer realtime. For example : $ ffmpeg -i "ScreeningSchedule-1.mov" -y "test.mp4" 2>&1 | tr '\r' '\n'>log.txt results in a file that is immediately filled with some information, then 5-10 secs later, more lines get dropped into the log file.

  At first I thought sed would be great for this : $ # ffmpeg -i "ScreeningSchedule-1.mov" -y "test.mp4" 2>&1 | sed 's/\\r/\\n/', but it gets to the line with all the carriage returns and waits until the processing has finished before it attempts to do anything. I assume this is because sed works on a line-by-line basis and needs the whole line to have completed before it does anything else, and then it doesn't replace the carriage returns anyway. I've tried various different regex's for the carriage return and new line, and have yet to find a solution that replaces the carriage return. I'm running OSX 10.6.8, so I am using BSD sed, which might account for that.

  I have also attempted to write the information to a log file and use tail -f to read it back, but I still run into the issue of replacing carriage returns in realtime.

  I have seen that there are solutions for this in python and perl, however, I'm reluctant to go that route immediately. First, I don't know python or perl. Second, I have a completely functional batch processing shell application that I would need to either port or figure out how to integrate with python/perl. Probably not hard, but not what I want to get into unless I absolutely have to. So I'm looking for a shell solution, preferably bash, but any of the OSX shells would be fine.

  And if what I want is simply not doable, well I guess I'll cross that bridge when I get there.