On the last three weeks I have been implementing the RTSP ANNOUNCE/RECORD. With this enhancement, the avconv can listen to an ANNOUNCE REQUEST which followed by SETUP and RECORD will allow to receive a stream and then handle the new incoming data.

The implementation is by today at my github https://github.com/nenjordi/libav/commits/rtsp-announce-preparepatch for those of you who want to take a look at its current status.

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SVC Structure by Jordi Ortiz is licensed under a Creative Commons Reconocimiento-CompartirIgual 3.0 Unported License.
Creado a partir de la obra en www.jordiortiz.es.

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Aquí podréis visitar el resto de ponencias. Muy recomendables todas. Enlace a vídeos del LTIM

Espero que os gusten.

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Algunas fotos que he ido haciendo con la cámara.

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As the result of the last year work we have recorded a video showing the capabilities of SVC. For the first time one can see for real how SVC can be used in deployments. Pay attention to the term client instead of user which was used on purpose, probably a user will never know even if SVC is being used.

The Video is divided in 4 parts:

- DQT Selection

DQT makes reference to the group of three (DID,QID,TID) which point to a specific layer setting the spatial, quality and temporal scalability level respectively.

This part represents how a client could set the DQT values to be adapted on the server side with a low cost adaptation provided by an SVC filter.

- BW Selection

Here we try to show how a client signaling the available bandwidth which could be calculated or extracted from network devices, gets different adaptations.

- Screen Size

One of the most desired SVC capabilities is providing service to different devices such as those with different screen size. We show here how the same video with spacial scalability is provided in 3 sizes: 480×320, 640×480 and 1280×720.

- IDR Effect

This case is a reflection on how waiting for IDR pictures to adapt can influence on the User perception (QoE). On the other hand adapting too frequently could lead to a bad QoE, a compromise must be found.

Special credits go to VTT Finland (ADTE development) and Universität Klagenfurt (SVCFilter development)

Como resultado de este último año de trabajo hemos grabado un vídeo que muestra las capacidades de SVC. Por primera vez uno puede ver de verdad cómo SVC puede ser usado en implantaciones.

El vídeo está dividido en 4 partes:

- Selección DQT

El término DQT hace referencia a la tripla (DID,QID,TID) que hace referencia a una capa específica indicando el nivel de escalabilidad espacial, de calidad y temporal respectivamente.  Nótese que hacemos referencia a cliente y no a usuario, un usuario probablemente nunca sepa ni siquiera que utiliza SVC.

Esta parte representa cómo un cliente podría establecer unos valores DQT a los que el lado del servidor debe adaptarse con una adaptación de bajo coste provista con un filtro SVC.

- Selección del Ancho de Banda

En esta sección intentaremos mostrar cómo un cliente que señalice el ancho de banda disponible, el cual podría ser calculado o extraído del dispositivo de red directamente, recibe distintas adaptaciones.

- Tamaño de pantalla

Una de las características de SVC más deseadas es proveer servicio a diferentes dispositivos tales como aquellos con diferentes tamaños de pantalla. Mostraremos cómo el mismo vídeo con escalabilidad espacial es provisto en 3 tamaños: 480×320, 640×480 y 1280×720.

- Efecto de las IDR

Este caso es una reflexión sobre cómo esperar a imágenes IDR para adaptar puede influenciar la percepción del usuario (QoE). Por otro lado, adaptando demasiado frecuentemente puede llevar a una mala QoE, se debe encontrar un compromiso.

Agradecimientos a VTT Finlandia (ADTE) y la Universidad de Klagenfurt (Filtro SVC)

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Image Credits www.enriquedans.com

Durante un tiempo estuve empleando la herramienta youtube-dl para este menester. Cual fue mi sorpresa cuando fui a utilizarla y ZAS! no funciona. Mi gozo en un pozo. Así que me tocó volver a buscar una alternativa.

cclive

Es una herramienta de línea de comandos que nos permite descargar vídeos de más de 40 sitios distintos como por ejemplo youtube, megavideo, dailymotion, … Esto es posible gracias a la librería libquvi. También puede resultar interesante la herramienta umph que permite emplear cclive con playlists, sin duda muy útil.

Entre las opciones de cclive destacaré las que a mi me han parecido más interesantes:

–limit-rate Nos permitirá limitar el ancho de banda consumido por cclive durante la descarga. Muy interesante si tienes pensado seguir navegando mientras descargas o vas a descargar durante horas y quieres seguir usando el ordenador con normalidad.

–format Para poder seleccionar el formato del vídeo, i.e. la calidad del mismo. Para ver los distintos formatos disponibles para cada website podemos emplear la opción –hosts

–number-videos Introduce numeración como prefijo al nombre del vídeo descargado.

Que no te gusta el formato flv (como a  mí), no te preocupes

ffmpeg -i fichero.flv fichero.mpg

Que quieres solamente el sonido (por ejemplo para crearte un tono para el móvil, cuidadín con la propiedad intelectual eh!! )

ffmpeg -i fichero.flv fichero.mp3

No olvides instalar libmp3lame para poder convertir a mp3.

A disfrutar!

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