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• how to install ffmpeg on localhost

  25 mars 2014, par Paul Ledger

  There is a lot of topics on this but after hours of reading i am still getting no where.
  I have found a lot of issues wit this.

  1. people have given links to files that no longer exist
  2. the help people have given refers to files that aren't included with the download

  This is the nearest i have found

  link

  I followed this exactly, after finding a different version of the file broken link

  version I found version available at sourceforge which isn't very helpful.

  Steps as decribed :

  1. unzip
  2. copy ffmpeg.exe somewhere and remember the path for later use
  3. move php_ffmpeg.dll to php extension dir (usually c :\xampp\php\ext)
  4. move all other files to Windows\System32 (except COPYING.GPLv3.txt,
     readme.txt)
  5. add extension=php_ffmpeg.dll to php.ini (usually
     c :\xampp\php\php.ini)
  6. restart apache with fingers crossed questions/answers
     http://www.apachefriends.org/f/viewtopic.php?f=16&t=41913

  But when I restart apache I get the error :

  The program can't because avcodec-51.dll is missing

  AND

  PHP startup : Unable to load dynamic libary php_ffmpeg.dll can't be found

  The php_ffmpeg file is in the apache extention folder and has been declared in the php.ini file. I don't really change many settings in my php.ini file so I just put iy at the top of the extentions, if this is the problem please let me know.

  extension=php_ffmpeg.dll <---first extention added
  extension=php_bz2.dll <---- this was allready there

  If anybody knows an easy way to install this on a localhost I would really appropriate and if I'm having this much trouble on localhost should I bother trying to get this working on my lunix server.

  (I am using xampp on windows and my lunix server is hosted through 1and1 - not my first choice but its for a friends site)

• Mux ts segments to fragmented mp4 in realtime

  10 avril 2021, par bsack

  I have an HLS stream which plays in the browser. What I want to do is have a URL like /stream.mp4 that plays the livestream back as a fragmented mp4 from the current point in time. This way you could download the stream as a single file and it would work without any js dependencies.

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  The method I thought of is :

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  1. send an mp4 header

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  2. wait for a new segment

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  3. convert the segment into an mp4 fragment with ffmpeg

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  4. send the mp4 fragment

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  5. go to 2.

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  (I know you can concatenate .ts segments but they don't play in Firefox.)

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  This answer describes how to create a fragmented mp4 when you have all the segments at hand (tl ;dr use -movflags frag_keyframe+emptymoov). But I want to do this on the fly so each new HLS segment is converted to an mp4 fragment as soon as it's created.

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  I think this is similar to what DASH does natively, where any chunk chunk-$n.m4s can be appended to init.m4s and it'll be a proper fragmented mp4. But can this be done without using DASH ?

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  How can I transmux a ts segment into an mp4 fragment ?

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  Edit : I found a way of doing what I wanted, but not through transmuxing mpegts segments to fmp4. It turns out that later versions of HLS do support fragmented mp4 (like DASH does), and FFmpeg provides the -hls_segment_type fmp4 option for this.

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• Ask Help for Reproduce AccMPEG coded by Du Kuntai

  30 novembre 2022, par censhallwe

  Here is his github : https://github.com/KuntaiDu/AccMPEG&#xA;When I follow his steps to reproduce AccMPEG, I meet some problems. It's my first time to reproduce others' paper. When I set up the conda environment, the conda_env.yml has some pip errors and stop like picture1 :
  &#xA;PIC 1.
  &#xA;So I change its name to accmpeg (originally diff) and delete some code about torch/torchvision/torchaudio/detectron2. After setup the environment, I run generate_mpeg_curve.py and meet some errors like picture2 :
  &#xA;PIC 2.
  &#xA;Maybe I failed to setup the environment. And when I run batch_blackgen_roi.py, I meet some errors like these :
  &#xA;IMG 3.
  &#xA;I search accmpeg and want to try to find solution from the Internet. But I don't get useful information. Therefore, I try to seek help. If you can give me a hand, I am very grateful.
  &#xA;If you can reproduce it well, please teach me how to operate. It's better if you have some useful pictures.Thanks very much !

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