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• ffmpeg.wasm DOMException : Failed to construct 'Worker' : Script at '/814.ffmpeg.js' cannot be accessed from origin ''

  18 mai 2024, par Quantum

  I have written a google chrome extension using local ffmpegwasm files (no need to run a server or download any ffmpegwasm files), which allows users to click an injected 'download' button under Reddit videos (via content_scripts). This was working great on ffmpegwasm v11, but since migrating to v12 (latest version) I have been unable to solve the following exception which is triggered during ffmpeg.load() : as seen in chrome's console log :

  


  DOMException: Failed to construct 'Worker': Script at 'https://www.redditstatic.com/814.ffmpeg.js' cannot be accessed from origin 'https://reddit.com'. At i.load (chrome-extension://ljejfmmefhnpbpdhkhbbajpihfhnbdnm/lib/ffmpeg/umd/ffmpeg.js:1:2918)


  


  I'm a programming beginner and I've been stuck trying to fix this for many, many hours. This exception does not happen and the video downloads if I instead use a feature of my extension which allows entering a Reddit video URL directly into a field in the extensions popup or options window. Also, I have no idea why the 814.ffmpeg.js file is being referenced along with redditstatic.com (from exception to exception, this url seems to randomly change to other reddit url's too), though I imagine this is part of the problem ?

  


  I have seen there are a couple of mentions of this error on the ffmpegwasm github repository, with some fixes involving using the worker814URL and/or classWorkerURL params within ffmpeg.load() and pointing them to the 814.ffmpeg.js file, which I have tried without any success (although I did notice that using classWorkerURL changed https://www.redditstatic.com/814.ffmpeg.js to chrome-extension://ljejfmmefhnpbpdhkhbbajpihfhnbdnm/lib/ffmpeg/umd/814.ffmpeg.js). Though, It seems that previous discussions around this error might not be too helpful for me as those appear geared towards ffmpegwasm running with a server, as apposed to entirely locally within a chrome extension.

  


  Any help would be super appreciated - many thanks

  


• avformat/iamf : Don't mix ownership and non-ownership pointers

  19 février 2024, par Andreas Rheinhardt

  avformat/iamf : Don't mix ownership and non-ownership pointers
  IAMFAudioElement and IAMFMixPresentation currently contain
  
  pointers to independently allocated objects that are sometimes
  
  owned by said structures and sometimes not.
  More precisely, upon success the demuxer transfers ownership
  
  of these other objects newly created AVStreamGroups, but it
  
  keeps its pointers. iamf_read_close() therefore always resets
  
  these pointers (because the cleanup code always treats them
  
  as ownership pointers). This leads to memory leaks in case
  
  iamf_read_header() without having attached all of these
  
  objects to stream groups.
  The muxer has a similar issue : It also clears these pointers
  
  (pointing to objects owned by stream groups created by the user)
  
  in its deinit function.
  This commit fixes this memleak by explicitly adding non-ownership
  
  pointers ; this also allows to remove the code to reset the
  
  ownership pointers.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/iamf.h
  • [DH] libavformat/iamf_parse.c
  • [DH] libavformat/iamf_writer.c
  • [DH] libavformat/iamfdec.c
  • [DH] libavformat/iamfenc.c

• FFMPEG Partial Audio Filter of Video File

  12 avril 2024, par Cole

  I am trying to apply an audio filter to a section of the audio track on a video file.

  


  Here are some details.
"video.mp4" is 1 minute and 36 seconds long. I want to lower the pitch of the first 30 seconds of the file. The video track does not need any change, so I can copy that and only transcode the audio. Note, I will have to do this same operation to other videos, with the pitch change at different times. This one is at the beginning, however.

  


  I have used this post for inspiration : https://superuser.com/questions/977743/ffmpeg-possible-to-apply-filter-to-only-part-of-a-video-file-while-transcoding

  


  I have tried the following :

  


  ffmpeg -i video.mp4 -filter_complex "[0:a]trim=start=0:duration=30,rubberband=pitch=0.5[a2];[0:a]trim=start=30[a3]" [a2][a3]concat[a] -map [a] -map [0:v] -c:v copy output.mp4


  


  The above combines the trim and rubberband into one action, but maybe that does not work (same error). In the below I separate them out.

  


  ffmpeg -i video.mp4 -filter_complex "[0:a]trim=start=0:duration=30[a1];[a1]rubberband=pitch=0.5[a2];[0:a]trim=start=30[a3]" [a2][a3]concat[a] -map [a] -map [0:v] -c:v copy output.mp4


  


  My thought process with the above is to take the audio track [0:a] and trim it to the portion I want to edit, now a1. Then apply the filter and make that a2. Lastly, take the other portion of the audio and save it as a3 (is this step even necessary ?). I concatenate the modified audio and unmodified audio (a2 and a3, respectively), then map the audio and video channels and output the final product.

  


  The error I receive is below.

  


  [Parsed_trim_0 @ 0x5623a0b03040] Media type mismatch between the 'Parsed_trim_0' filter output pad 0 (video) and the 'Parsed_rubberband_1' filter input pad 0 (audio)
[AVFilterGraph @ 0x5623a0ab6100] Cannot create the link trim:0 -> rubberband:0
Error initializing complex filters.
Invalid argument


  


  I think that this error is related to an audio/video track issue, but I don't know where to begin. Where am I going wrong ? What other suggestions do you have that I have not considered ?

  


  Edit : Thank you for pointing out the atrim ! That solved that particular issue. There were some other issues I had to figure out as well.