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• FFMpeg slide text from right to left an leave from left to right after x seconds

  13 août 2018, par Marco van 't Klooster

  I’m trying to slide a text inside my video from right to left and leaving the video after 13 seconds.
  The text has to stay there for 13 seconds and the leave in the opposite direction the video.

  Right now I’m using the following command :
  ffmpeg -i Pool\ scores.m4v -vf "[in]drawtext=fontfile=/usr/share/fonts/truetype/msttcorefonts/Arial.ttf:fontsize=40:fontcolor=white:x=900:y=570:text='Marco':enable='between(t,11,24)' [out]" -c:v libx264 scrolling.m4v

  So the text Marco have to be at x=900 and y=570. Thats also the coordinate where the text have to leave from.

  The idea is to create a pool score board where the video is auto generated with dynamic text. In this image there is an example of what the animation have to look like. I’ve to retime it tom match the same speed.
  See example

  Thanks in advance !!

• Appium screen recording doesn't work on simulator

  31 août 2022, par Oks

  I'm running automation tests on simulator and trying to record screen but it crashes on line driver.start_recording_screen()
I'm using Python for testing and Flutter for client side.

  


  self.utils.driver.switch_to_native_context()
driver.start_recording_screen()


  


  Appium logs :

  


  [ffmpeg] ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers
[ffmpeg]   built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
[ffmpeg]   configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
[ffmpeg] 
[ffmpeg]   libavutil      57. 28.100 / 57. 28.100
[ffmpeg]   libavcodec     59. 37.100 / 59. 37.100
[ffmpeg]   libavformat    59. 27.100 / 59. 27.100
[ffmpeg]   libavdevice    59.  7.100 / 59.  7.100
[ffmpeg]   libavfilter     8. 44.100 /  8. 44.100
[ffmpeg]   libswscale      6.  7.100 /  6.  7.100
[ffmpeg]   libswresample   4.  7.100 /  4.  7.100
[ffmpeg] 
[ffmpeg]   libpostproc    56.  6.100 / 56.  6.100
[ffmpeg] 
[ffmpeg] [mjpeg @ 0x148605ab0] No JPEG data found in image
[ffmpeg] 
[ffmpeg] [mjpeg @ 0x14b104080] Could not find codec parameters for stream 0 (Video: mjpeg, none(bt470bg/unknown/unknown)): unspecified size
[ffmpeg] Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[ffmpeg] Input #0, mjpeg, from '********':
[ffmpeg]   Duration: N/A, bitrate: N/A
[ffmpeg]   Stream #0:0: Video: mjpeg, none(bt470bg/unknown/unknown), 25 tbr, 1200k tbn
[ffmpeg] 
[ffmpeg] Stream mapping:
[ffmpeg]   Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
[ffmpeg] Press [q] to stop, [?] for help
[ffmpeg] [mjpeg @ 0x14b004620] No JPEG data found in image
[ffmpeg] Error while decoding stream #0:0: Invalid data found when processing input
[ffmpeg] Cannot determine format of input stream 0:0 after EOF
[ffmpeg] Error marking filters as finished
[ffmpeg] Conversion failed!
[ffmpeg] 
[XCUITest] Screen capture process did not start within 5000ms. Continuing anyway



  


  Anyone knows how to fix it ?
Thanks !

  


• Can -axcorrelate be used for time delay analysis ?

  31 octobre 2020, par koral

  I'm trying to find a way to easily automatically synchronize two audio tracks. I've found the axcorrelate filter in ffmpeg's documentation, and I'm curious if it can be used for time delay analysis with cross-correlation.

  


  I've been playing around with correlating different audio files and opening them in Audacity to see some sort of a pattern that can be detected in the output file, but I wasn't able to see anything that stands out to me.

  


  My observations :

  


  

  • correlating two same tracks results in mostly empty output

  


  • if I delay one of the input files by one second, the correlation start (time in wav file when for the first time a sound is output) is moved by one second forward, but the delay cannot be calculated since the original start time is unknown

  


  • correlating some original file with that original file delayed by some amount results in gibberish data, that seems random to me

  


  


  Any help would be appreciated. I found this pdf that uses Praat to detect the cross correlation, but I'd like to keep this FFmpeg only to not ship multiple dependencies to my users.