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• How to reproject and join these two clips with ffmpeg ?

  20 janvier 2023, par jumpjack

  I have two videoclips embedded in this single video :

  


  https://sci.esa.int/web/cassini-huygens/-/39218-huygens-descent-to-titan-surface

  


  Download lo-res : link

  


  The timings which I calculated to sync the two clips are :

  


  

  • 01:33.233 - 02:24.133

  


  • 02:33.700 - 03:24.600

  


  


  I want to join them into a single view ; I thought that cropping the video between the dots which mark east and west was enough, but it is not : I tried this, but with terrible results :

  


  #echo off
# Cut east and west clips:
@echo cut east...
ffmpeg -ss 01:33.233 -to 02:24.133 -i %1 -vf "crop=900:450:73:0, pad=w=iw:h=2*ih:x=0:y=ih:color=black" -y east-crop.mp4
@echo cut west...
ffmpeg -ss 02:33.700 -to 03:24.600 -i %1 -vf "crop=900:450:73:0, pad=w=iw:h=2*ih:x=0:y=ih:color=black" -y west-crop.mp4

@echo merge...
ffmpeg -i west-crop.mp4 -i east-crop.mp4 -filter_complex hstack=inputs=2 -y combined.mp4


  


  I think I have also to reproject... but I have no idea of which is the projection used.

  


  Any suggestion ?

  


  Example east/west frames :

  


  

  


  

  


  I would like to obtain a single equirectangular image which reprojects into a full sphere when seen into a VR viewer.

  


  Instead, I am getting this :

  


  

  


• Using hwaccel ffmpeg option with moviepy library

  12 octobre 2022, par Nicola Lepetit

  I am trying to add the hwaccel option of ffmpeg to a script I am working on in Python, based on the moviepy library, by passing the options via the ffmpeg_params parameter :

  


  from moviepy.editor import VideoFileClip

ASSETS_FOLDER = "./assets/backgrounds/road/"
video_file_name = "12386.mp4"
start_time = 5
end_time = 20
target_file = "output.mp4"

video = VideoFileClip(f"{ASSETS_FOLDER}{video_file_name}")
new = video.subclip(start_time, end_time)
new.fps = 25
new.write_videofile(target_file, ffmpeg_params= ['-hwaccel','cuda'])


  


  The problem is that these ffmpeg_params are added at the end of the ffmpeg command line, so I am getting the following error :

  


  [Errno 22] Invalid argument

MoviePy error: FFMPEG encountered the following error while writing file 
   ./assets/temp/3/cut1.mp4:

 b'Option hwaccel (use HW accelerated decoding) cannot be applied to output url 
  ./assets/temp/3/cut1.mp4 -- you are trying to apply an input option to an output file
  or vice versa. Move this option before the file it belongs to.\r\nError parsing
  options for output file ./assets/temp/3/cut1.mp4.\r\nError opening output files:
  Invalid argument\r\n'


  


  Is there another way to use the option with moviepy

  


• How to avoid ffmpeg failing to add chapters to mov file ?

  27 septembre 2022, par BabaG

  I've been trying all day to get ffmpeg to add chapters to a prores mov file. It does add the first two, but then it fails with the name of the text file and an error message :

  


  chapterstest_orig.txt: Invalid data found when processing input


  


  I see lots of online references to the format of both the ffmpeg command, as well as the text file containing the chapter metadata. Here are mine :

  


  ffmpeg -i chapterstest_orig.mov -i chapterstest_orig.txt -map_metadata 1 -codec copy chapterstest.mov


  


  i've also tried it with -map_chapters :

  


  ffmpeg -i chapterstest_orig.mov -i chapterstest_orig.txt -map_metadata 1 -map_chapters 1 -codec copy chapterstest.mov


  


  Here's a copy of my text file, containing the chapter info :

  


  ;FFMETADATA1
title=Angel's Gate Cultural Center
artist=Buzzworld

[CHAPTER]
TIMEBASE=1/1000
START=0
END=6999
title=Buzzworld 10-10-1997

[CHAPTER]
TIMEBASE=1/1000
START=7000
END=290999
title=The Road To Lisdoonvarna

[CHAPTER]
TIMEBASE=1/1000
START=291000
END=739999
title=Jack Orion

[CHAPTER]
TIMEBASE=1/1000
START=740000
END=992999
title=The Frieze Britches

[CHAPTER]
TIMEBASE=1/1000
START=993000
END=1295999
title=The Blackleg Miner

[CHAPTER]
TIMEBASE=1/1000
START=1296000
END=1559999
title=Johnny Jump Up

[CHAPTER]
TIMEBASE=1/1000
START=1560000
END=1867999
title=Tom Billy's

[CHAPTER]
TIMEBASE=1/1000
START=1868000
END=2143999
title=When Will We Be Married?

[CHAPTER]
TIMEBASE=1/1000
START=2144000
END=2500999
title=The Old Bush

[CHAPTER]
TIMEBASE=1/1000
START=2501000
END=2839000
title=Niamh's Capers


  


  If I delete everything after the second chapter, the file processes. It always fails if I add more chapters.

  


  I've also tried using things like :

  


  -map 0:v -map 0:a -map 0:s


  


  Any help is much appreciated. I'm kind of at my wits end here.

  


  Thanks.