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• How to generate pcm audio file by setting 20 bit depth ?

  6 juillet 2015, par vip007

  No option using ffmpeg

  I am using ffmpeg to generate audio data. I am using following command

  ffmpeg.exe -i in.wav -ar 44100  -acodec pcm_s16le  -ac 1 out.wav

  but there is no option to convert to 20 bit depth pcm audio. (something like pcm_s20le).

  I want to perform some operations on apple codec (e.g. encoding pcm audio data to alac).

  On ALAC source : http://alac.macosforge.org/trac/browser/trunk/ReadMe.txt , it has been mentioned like this ;

  Apple Lossless supports the following features
  1. Bit depths 16, 20, 24 and 32 bits.

  Media Foundation on windows throwing exception for 20 bit depth

  I tried sample encoding and transcoding application mentioned on MSDN https://code.msdn.microsoft.com/windowsapps/media-transcode-sample-f7ba5269

  with following configuration but it failed

  spTypeOut->SetUINT32(MF_MT_AUDIO_BITS_PER_SAMPLE, 20);  

  NOTE : but i put 16 instead of 20 ; it created smoothly.

  Is there any way to generate such 20 bit PCM audio ? What is so special about 20 bit depth that it is not being considered on ffmpeg and media foundation but on apple codec ?

• mp4 to hls ffmpeg during upload to Google storage

  13 février 2018, par Sofiia Vynnytska

  I have an API written on Java, which is used for uploading mp4 videos on front-end. We store those videos on google cloud and our application is running in google cloud. For Android clients, we need to convert uploaded videos to hls. Unfortunately, Google cloud does not have transcoder for videos and I need to convert video in another way. I found that ffmpeg can do this. But I cannot find a good solution for this and I need an advice.
  One of ideas is to deploy cloud function on google cloud, which will convert mp4 to hls after uploading video. Can I need to upload this m3u8 and ts videos to storage ? Will be this approach okay ? Is there any other possible solution ?

• Libav/FFmpeg and Google Summer of Code 2012

  26 avril 2012, par Multimedia Mike — General, ffmpeg, gsoc, gsoc2012, hevc, libav, opus, rtmp, ut video

  So, the projects are participating in the Google Summer of Code for the 2012 season. (While Libav is the project officially accepted to particular, I still refer to the projects because FFmpeg will also benefit).

  Here are the students, projects, and mentors for this summer :

  1. Andrew D’Addesio is working on an Opus Decoder, mentored by Justin Ruggles
  2. Guillaume Martres is working on an HEVC video decoder, mentored by Mashiat Sarker Shakkhar
  3. Jan Ekström is working on an LGPL Ut Video encoder, mentored by Kostya Shishkov
  4. Jordi Ortiz is working to rewrite avserver, mentored by Luca Barbato
  5. Samuel Pitoiset is working on an RTMP[E|S|T|TE] protocol implementation, mentored by Martin Storsjö

  Wish them luck– these are some ambitious projects.