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• How do I play back video on Android with custom playback speed ?

  13 novembre 2015, par guidow

  I want to play back a video in Android, rendering it to a SurfaceTexture or something else that is usable as an OpenGL ES texture, but I need very precise control over the playback speed of the video to synchronize it to a stream of external events. These events will happen at a roughly predictable speed, but the exact speed will depend on many small mechanical details, influenced by many small factors, including the weather (and possibly even the phase of the moon...).

  The android.media.MediaPlayer class provided by android allows rendering to a SurfaceTexture (and the 360Videos app from the Oculus Mobile SDK successfully uses that feature), but unfortunately does not seem to allow altering the playback speed, at least not as far as I could tell from the documentation here.

  I have tried pausing and resuming the playback using pause() and start() respectively, to influence the playback speed, but that leads to extremely choppy and slow playback. My idea here was to make the video have a higher framerate than would ever be needed, and to then manually retard every frame until it actually needs to be shown. From the messages in the log, it looks to me like the MediaPlayer class will release various needed resources on pause and rerequest them on resume, which obviously kills performance if you do that once per frame.

  Another option I am looking at is ffmpeg. This one seems like it will do what i want, it doesn’t do any timings itself, it just decodes frames whenever I tell it to to a buffer, leaving me to use it however I want, whenever I want. The obvious drawback is that ffmpeg, at least on android, doesn’t do hardware decoding and probably won’t be able to decode 4K media in realtime.

  Yet another thing I was looking at was OpenMAX AL. Unfortunately, OpenMax AL is pretty hard to get into. I haven’t found any good beginner’s documentation yet, only some old, maybe outdated, READMEs as well as the interface specification from Khronos. The latter is a very long and cumbersome read, though, and I couldn’t yet even figure out if OpenMAX AL will even allow me to do my own timings...

• ASPSMS : a successful integration with Piwik

  3 octobre 2017, par Piwik Core Team — Development

  Have you ever wondered how an integration between a third party company and Piwik is possible ? What are the key factors for a good partnership ? This article describes our recent collaboration with a company for a mobile messaging integration.

  At Piwik, we are always looking for new functionalities to build and improve the work of our community members. ASPSMS, an innovative SMS Gateway & Messaging solutions provider got in contact with us in order to do just this.

  Why did we decide to partner with ASPSMS ?

  • Fast
  • Easy
  • Just works

  Those three words define the collaboration we had with ASPSMS and in the end everyone benefits.

  Stefan, one of our developers who did the integration into Piwik, says “Thanks to an easy to understand API the SMS integration was done in a couple of hours. We got SMS credits upfront for testing which helped a lot.”

  Using the ASPSMS integration, you can receive a daily or weekly SMS message listing the Key Performance Indicators of your website(s).

  ASPSMS is now part of Piwik through the Mobile messaging settings :

  

  As a company, how can I contribute to Piwik ?

  If, like ASPSMS, you are providing great services which can help Piwik final users take better decisions, do not hesitate to contact the Piwik core team.

  You can also start to develop your own, specific plugins, that you can freely publish on the Piwik marketplace.

  About ASPSMS

  VADIAN.NET AG is today one of the leading global providers of SMS solutions with more than 200,000 satisfied business clients. The product ASPSMS was launched in 2001. ASPSMS is a product of VADIAN.NET AG, a Swiss based Internet and Mobile Solutions provider.

  

  Learn more about ASPSMS.

• Live Streaming WebM with Wowza Server

  2 décembre 2010, par noreply@blogger.com (John Luther)

  Guest blogger Charlie Good is CTO and co-founder of Wowza Media Systems

  As a company, we at Wowza move fast and like to tinker. When WebM was announced in May, we saw it as a promising new approach to HTML5 video and decided to do an experiment with live WebM streaming over http.

  Adding WebM VP8 video and Vorbis audio to the other encoding formats that our server supported was easy (we designed the Wowza server to be codec-agnostic). We then created a WebMfile and implemented WebM HTTP streaming.

  We originally created the demo as a proof-of-concept for the IBC show in September, 2010 but have made it available to watch on our web site.

  The file is streamed live (more precisely, "pseudo-live") over http using the Wowza server-side publishing API (PDF). The result is very impressive ; playback starts fast and the VP8 image quality is fantastic.

  You will need a WebM-enabled browser or VLC media player 1.1.5 to view the live stream.

  If you’re interested in keeping up with Wowza’s WebM progress, visit Wowza Labs or drop us a note at info@wowzamedia.com.