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• ffmpeg : error while loading shared libraries : libmp3lame.so.0 : cannot open shared object file : No such file or directory

  3 septembre 2013, par GetItDone

  I am using this buildpack (heroku-python-buildpack-ffmpeg-lame) for my app on heroku that uses ffmpeg to convert uploaded videos to .mp4. I had been using the version without libmp3lame, and since I switched I am getting the error

  ffmpeg: error while loading shared libraries: libmp3lame.so.0: cannot open shared object file: No such file or directory

  I checked to see where libmp3lame.so.0 is located on my server with heroku run —app myapp find / -name libmp3lame.so.0, and the resulting path was /app/vendor/lame/lib/libmp3lame.so.0. I tried adding /vendor/lame/lib to my heroku path using the heroku config:set command, but even after adding it I still get the same error. Anyone know what the problem could be ?

• Does Facebook multicast or unicast the live videos to its viewers ?

  14 avril 2018, par Kamran Zahoor

  This is how a live stream goes from one broadcaster to millions of viewers :

  1. A broadcaster starts a live video on their phone.
  2. The phone sends a RTMP stream to a Live Stream server.
  3. The Live Stream server decodes the video and transcodes to multiple bit rates.
  4. For each bit rate a set of one-second MPEG-DASH segments is continuously produced.
  5. Segments are stored in a datacenter cache.
  6. From the datacenter cache segments are sent to caches located in the points of presence (a PoP cache).
  7. On the view side the viewer receives a Live Story.
  8. The player on their device starts fetching segments from a PoP cache at a rate of one per second.

  My question is simple. After the step 6, does PoP cache/Edge cache/eNB (edge layer node) multicast a live video content to multiple viewers or unicast each user separately (opening up seperate streams for each user) ?

• AWS Lambda. Error=20 (Not a directory) when moving FFmpeg to /tmp

  18 novembre 2017, par Omar Riaz

  I am using the ffmpeg-cli-wrapper to run FFmpeg from an application I upload onto AWS lambda. I was initially getting the

  error=13 Permission Denied

  when trying to call it via the wrappers ProcessBuilder. My inital solution was to chmod 755 ffmpeg before uploading, but it didn’t help.

  For information, my FFmpeg and ffprobe files are located in the following classpath : static/ffmpeg/ffmpeg and static/ffmpeg/ffprobe. They are also statically linked.

  AWS Lambda permission denied when trying to use ffmpeg

  I’ve tried to follow the instructions given in the example above, but when I try to perform either mv or cp command :Runtime.exec("mv " + pathToFFmpeg + " /tmp"), I get the

  error=20, Not a directory

  error.

  I know that I have the correct path for FFmpeg because the following command mv *pathToFFmpeg* *an arbitrary name* runs without error, meaning that the file is there and so the mv command just renames it as it’s supposed to do.