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  • AVAssetWriter single frame

    5 novembre 2015, par Robert Figueira

    I’m trying to encode frame sequences to quicktime movies using AVAssetWriter, which works brilliantly. Problem is, it fails when I give it only one frame to write as a movie (the details of why I need single frame quicktime movies aren’t important, suffice to say it’s a necessary workflow thing for a very specific use case). It works fine with two frames, but with one frame it exits with the following error when calling AVAssetWriter.finishWritingWithCompletionHandler :

    writer failed with error : Optional(Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=NSUnderlyingError=0x6180000427c0 Error Domain=NSOSStatusErrorDomain Code=-12769 "(null)", NSLocalizedFailureReason=An unknown error occurred (-12769), NSLocalizedDescription=The operation could not be completed)

    This is true for all file types - since by that time it’s just reading in pixel buffers. I stepped through line by line while debugging and it definitely has appended the single pixel buffer before finishing, it just won’t write the movie with only a single frame.

    The thing that makes me think it’s more of an Apple problem and not just me is that ffmpeg won’t write single frame movies either... Anyone have some insight as to why this is happening ? I can’t see any reason why a two frame movie would work fine but a one frame movie fails to write. Thanks,

    Robert

  • PHP ID3 set tag on-the-fly via stream ?

    17 novembre 2012, par Mark F

    I am converting a video file to mp3 on the fly via passthru('ffmpeg ...') and I was wondering if it is possible to use id3_set_tag() onto the output stream. The documentation says id3_set_tag() can take a stream instead of a filename, but when i try php://STDOUT or php://output, it segfaults.

    Any help greatly appreciated !

  • unity recorder use at runtime in C#

    5 février 2020, par bluejayke

    I’m using the unity recorder package in the editor, but I wasn’t sure / didn’t see in the docs if its possible to use the unity recorder package to capture video at runtime — meaning after the project is built to webGL etc., can unity record, and perhaps send / stream the video result to a server ? If not how else would this be accomplished ?

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