Diferencia entre ABR y VBR

ABR y VBR son dos de los modos de codificación en LAME. Se utilizan para codificar archivos de audio y video. Muchas personas asumen que estos dos son iguales o sinónimos el uno para el otro. Sin embargo, esta es una idea completamente equivocada. ABR y VBR son dos aspectos muy diferentes, aunque ambos están relacionados con la codificación. La forma en que trabajan difiere de varias maneras. En ABR, decidimos un objetivo particular de tasa de bits. Mientras que en el caso de VBR, podemos establecer un objetivo para una calidad particular.

En este artículo, trataremos de conocer ABR y VBR en detalle. Cuando los estudiemos individualmente, será más fácil marcar la diferencia entre los dos. Además, podremos tener una idea más clara y conocimiento.

ABR vs VBR

La principal diferencia entre ABR y VBR es que en ABR, la tasa de bits promedio es constante. Sin embargo, cuando consideramos la tasa de bits en cada cuadro, es variable. Mientras que, en el caso de VBR, su tasa de bits es variable es la tasa de bits en todo momento. El cambio tiene lugar con respecto a la información que debe codificarse.

ABR significa tasa de bits promedio. Se usa para contar sobre la tasa de bits que requerimos. Su calidad no es tan alta como VBR. Tiene una tasa de bits diferente en diferentes partes que pueden ser más altas o más bajas. Finalmente, la tasa de bits promedio se obtiene para audio o video en particular. Generalmente se mide por segundo.

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Por otro lado, VBR significa tasa de bits variable. Se utiliza para contar la calidad que queremos. Su calidad es más alta que ABR. En este sistema, permite que la velocidad de bits t varíe durante partes de audio o video en particular. La ventaja general de la codificación VBR es una tasa de bits óptima de un cuadro a otro.

Tabla de comparación entre

Parámetros de comparación. ABRVBRConsistencia Cada cuadro tiene una tasa de bits variable, sin embargo, la tasa de bits promedio es constante. Tiene una tasa de bits variable a través de out.FocusABR tiene como objetivo establecer la tasa de bits para el archivo de audio o video. VBR tiene como objetivo establecer el calidad de un archivo de audio o video. Calidad La calidad de ABR no es tan alta como VBR. Proporciona mayor calidad que ABR. Además, tiene una mejor relación calidad / tamaño. SizeIt produce archivos más grandes en comparación con VBR. Produce archivos más pequeños en comparación con VBRUnknown Variant En ABR, se desconoce la calidad resultante de los archivos codificados. En VBR, se desconoce el tamaño resultante de los archivos codificados.

¿Qué es ABR?

La tasa de bits promedio es el valor promedio y final recaudado del grupo de segmentos. Se mide por segundo y se obtiene dividiendo el número de bits. Cuando se trata de calidad, ABR es mucho más bajo en calidad en comparación con VBR.

También podemos definir ABR como el valor promedio o la cantidad promedio de datos que se transfieren por unidad de tiempo. Generalmente se usa para archivos de música que se conocen como mp3.

Se ha comprometido en su calidad debido al uso de velocidades de bits más bajas. Se lleva a cabo durante el proceso de codificación y es eficiente. También es un proceso rápido que se considera una de las ventajas de ABR. Su objetivo es establecer la tasa de bits a partir de archivos de audio y video.

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Para una codificación precisa, requiere una codificación de dos pasos. Esto se debe a que, en la primera parte, no es posible conocer y registrar el valor exacto de la tasa de bits. Por lo tanto, procede de tal manera. Sin embargo, la tasa de bits no varía mucho.

¿Qué es VBR?

VBR es una tecnología utilizada en telecomunicaciones y computación. Es una forma de codificación relacionada con las grabaciones de archivos de sonido o video. La medición generalmente se obtiene por segundo. Proporciona una gran calidad que es más alta que ABR.

Tiene varios segmentos. Cada segmento tiene un rango variable de tasa de bits. Es por eso que se conoce como tasa de bits variable. Tiene una alta tasa de bits y, por lo tanto, necesita un gran espacio de almacenamiento. Sin embargo, la tasa promedio se puede calcular para obtener un valor fijo.

El uso más común de VBR es entregar el HTTP de contenido de video particular. La codificación VBR se utiliza para regular la velocidad de datos y el límite establecido por nosotros. La tasa de bits de los archivos sigue aumentando o disminuyendo mientras avanza a través del segmento,

El proceso de codificación es muy flexible y preciso. También proporciona una relación calidad-espacio satisfactoria. Sin embargo, el proceso lleva mucho tiempo. El procedimiento general es bastante complejo. Por lo tanto, la probabilidad de causar errores es alta. Además, la compatibilidad del hardware es una preocupación real.

Diferencias principales entre ABR y VBR

  1. La principal diferencia entre ABR y VBR es su objetivo principal. ABR se usa para establecer la tasa de bits para el archivo de audio o video. Mientras que VBR se usa para establecer la calidad de un archivo de audio o video.
  2. La calidad de ABR no es tan alta como VBR. Por otro lado, VBR proporciona mayor calidad que ABR.
  3. ABR significa tasa de bits promedio, mientras que VBR significa tasa de bits variable.
  4. El tamaño es un factor bastante importante en la codificación. ABR puede producir archivos más grandes en comparación con VBR.
  5. Hay una variable desconocida para ambos. En el caso de ABR, es la calidad. Sin embargo, en el caso de VBR, es el tamaño.
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Síntesis

Después de estudiarlos individualmente, podemos concluir que ABR y VBR son dos tipos diferentes de codificación. La diferencia básica radica en su contenido de tamaño de archivo. Además, ABR es principalmente para archivos de audio o mp3. Donde sea que VBR sea principalmente para archivos de video. Mientras escuchamos los archivos respectivos, podemos establecer una clara diferencia entre sus cualidades. VBR tiene una buena relación calidad-tamaño. Además, su calidad es mejor que ABR.

ABR puede proporcionar margen de compromiso en caso de escasez de recuerdos. Sin embargo, cuando la tasa de bits se establece muy baja, ABR puede eventualmente resultar en un sonido distorsionado y de baja calidad. Cuando aumenta la calidad, el archivo VBR permanece del mismo tamaño. Sin embargo, su tamaño es desconocido. Produce archivos más pequeños en una configuración más alta.

  1. https://ieeexplore.ieee.org/abstract/document/658906/
  2. https://ieeexplore.ieee.org/abstract/document/610048/

Contenido

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