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• Appium iOS screen recording in parallel runs result in overlapping videos

  29 juillet 2020, par Shiori Bermudo

  My code is in Python. I'm using appium's built in function driver.start_screen_recording() driver.stop_screen_recording().

  


  I run two tests (A and B) on different devices (A and B respectively), different appium servers (ports) and different wdalocalports. The tests are running on a schedule in Jenkins.

  


  Each test look something like this :

  


  self.driver = webdriver.Remote("http://localhost:portA/B")
# Part1
self.driver.start_screen_recording()
# do something ...
vbytes = self.driver.stop_screen_recording()
self.save_movie(vbytes, Part1fileName)
# Part2
self.driver.start_screen_recording()
# do something ...
vbytes = self.driver.stop_screen_recording()
self.save_movie(vbytes, Part2fileName)
# do something until test is over...
self.driver.quit()


  


  When Test B starts while Test A is running, the video output of B is showing the screen of Test A. The saved filenames are correct. TestA.mp4 is correct but TestB.mp4 shows the screen of Device A.

  


• Powerpoint can't show a video with headers. I see green screen

  28 novembre 2017, par zinon

  I’ve created a video using ffmpeg that contains headers.

  My script for creating it is :

  ffmpeg.exe -f rawvideo -vcodec rawvideo -s 560x448 -r 40 -pix_fmt yuv420p -i C_L_560x448_40_static_maxSSIM_QP23_B2.yuv -vcodec rawvideo -qscale 0 -filter_complex "drawtext=fontsize=32: fontfile=FreeSerif.ttf: text='SSIM=0.961': x=(w-tw)/2: y=(lh/2): fontcolor=orange, drawtext=fontsize=22: fontfile=FreeSerif.ttf: text='Bitrate≤1800 [1873 kbps], Frame rate≥40 [43.98 fps]': x=(w-tw)/2: y=(lh/2+30): fontcolor=orange : box=1: boxcolor=0x00000099, drawbox=x=80:y=160:w=220:h=135:color=red@0.5" C_L_560x448_40_static_maxSSIM_QP23_B2_new.avi

  Firstly, media player showed it as green screen. I downloaded

  Media Player Codec Pack

  and now show its correclty.

  However, when I insert it in powerpoint 2016 I have the same problem of green screen. Do you know how to fix this ?

  vlc player can play it correctly. Is there any way to change the player of excel and use vlc player instead ?

• get consistent 60fps while recording X screen with ffmpeg

  28 janvier 2021, par thelmuxkriovar

  I wrote the following script to record an X screen for a specified amount of time, to make sure that it's lossless I've separated it into two steps

  


  

  1. record for the specified amount in a codec that requires almost no compression (so there's no overhead that might cause frames to be dropped)

  


  2. re-encode the original video into HEVC to make the filesize significantly smaller

  


  


  ffmpeg -hwaccel cuda -hwaccel_output_format cuda -vsync 1 -f x11grab -probesize 128M -s 1920x1080 -r 60 -i :0.0 -qscale 0 -vcodec huffyuv -t 00:01:13 "$video.avi" # record the screen losslessly
ffmpeg -hwaccel cuvid -vsync 1 -i "$video.avi" -map 0:0 -c:v:0 hevc_nvenc -crf 23 -preset medium "$video-clean.mp4"


  


  This works just like I expect it to some of the time, but very often it drops a lot of frames (I've seen as many as 10000 frames dropped on occasion)

  


  The gpu is a 1080 TI that's being used just for rendering an X server with a chrome window and recording it, according to nvidia-smi the usage never goes to higher than 50% even in the most extreme cases.

  


  I don't know what else to try, I thought about using a ramdisk to write the file to as it might be an IO problem, but ffmpeg refuses to write to tmpfs (for some reason I can't explain)