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Storage requirements

Storage requirements

Jul 24, 2019

This article helps disk size dimensioning. Required storage size depends upon the number and length of calls and the applied codec.

Estimate your storage requirements

You can download the Excel  to estimate your storage requirements for IM, voice, video, telepresence and screen recording applications. It also provides you information on database storage sizing.

The calculator sheet includes Excel macros, which might be disabled when the file is downloaded from the site. Please Enable Editing and Enable Content (to turn on macros) when Excel is asking for it, otherwise the calculator will not work.

Supported voice and video codecs for recording

The system supports recording of the following voice codecs:

Codec name

Sample rates

Codec name

Sample rates

G.711 A-law, G.711 μ-law

8Khz

G.723

8Khz

G.726-16, G.726-24, G.726-32, G.726-40

8Khz

G.728

8Khz

G.729, G.729A, G.729B, G.729AB

8Khz

GSM

8Khz

iLBC

8Khz

RED

8Khz

G.722

16Khz

SILK

8Khz, 16Khz

Microsoft RTAudio (X-MSRTA)

8Khz, 16Khz

G.722.1

16Khz, 32Khz

Siren7, Siren14

16Khz, 32Khz

Speex

8Khz, 16Khz, 32Khz

Opus

8Khz, 16Khz, 48Khz

CELT

8Khz, 16Khz, 32Khz, 48Khz

L8 (PCM8)

8Khz, 16Khz, 32Khz, 48Khz

L16 (PCM16, Cisco Wideband)

8Khz, 16Khz, 32Khz, 48Khz

MP4A-LATM

48Khz

MPEG4-generic

48Khz

AAC-LD

48Khz

 

The system supports the recording of the following video codecs:

  • H.261

  • H.263

  • H.263+

  • H.263++

  • H.264

  • H.264 SVC

  • VP8

Voice codecs for storage

The Verba system is able to store audio files in many file formats with different codecs. The sample rate of the output file depends on the sample rate of the input codec (see above).

Supported formats:

Codec for storing media

File format

Sample rate

Bandwidth

1-minute file size

1-hour file size

Codec for storing media

File format

Sample rate

Bandwidth

1-minute file size

1-hour file size

PCM16


wav

8Khz

128 Kbps

960 KB

56.3 MB

16Khz

256 Kbps

1.9 MB

112.5 MB

32Khz

512 Kbps

3.8 MB

225 MB

48Khz

768 Kbps

5.6 MB

337.5 MB

PCM8   

wav

8Khz

64 Kbps

480 KB

28.1 MB

16Khz

128 Kbps

960 KB

56.3 MB

32Khz

256 Kbps

1.9 MB

112.5 MB

48Khz

384 Kbps

2.8 MB

168.8 MB

G.711
(both A and μ)

wav

8Khz

64 Kbps

480 KB

28.1 MB

16Khz

128 Kbps

960 KB

56.3 MB

32Khz

256 Kbps

1.9 MB

112.5 MB

48Khz

384 Kbps

2.8 MB

168.8 MB

MSADPCM

wav

8Khz

32 Kbps

240 KB

14.1 MB

16Khz

64 Kbps

480 KB

28.1 MB

32Khz

128 Kbps

960 KB

56.3 MB

48Khz

192 Kbps

1.4 MB

84.4 MB

GSM FR
most used 

wav

8Khz

13,2 Kbps

99 KB

5.8 MB

Speex

ogg

8Khz

6 Kbps

45 KB

2.6 MB

16Khz

16 Kbps

120 KB

7 MB

32Khz

24 Kbps

180 KB

10.5 MB

High Quality Speex

ogg

8Khz

10 Kbps

75 KB

4.4 MB

16Khz

24 Kbps

180 KB

10.5 MB

32Khz

32 Kbps

240 KB

14.1 MB

Opus

ogg

8Khz

9 Kbps

67.5 KB

4 MB

16Khz

18 Kbps

135 KB

7.9 MB

24Khz

24 Kbps

180 KB

10.5 MB

48Khz

32 Kbps

240 KB

14.1 MB

High Quality Opus

ogg

8Khz

14 Kbps

105 KB

6.2 MB

16Khz

24 Kbps

180 KB

10.5 MB

24Khz

32 Kbps

240 KB

14.1 MB

48Khz

48 Kbps

360 KB

21.1 MB

Stereo recording

With stereo recording, the caller and the callee are recorded into two separate channels; caller in the left channel and the callee in the right channel. This enables listening to the participants separately during the playback.

In the case of stereo recording mode, the recorded media file sizes have to be multiplied by two. There are two exceptions: 

  • GSM FR does not support stereo recording

  • In the case of Speex codec, the multiplier is only 1.2X

Silence Suppression (Voice Activity Detection, VAD)

The size of the recorded media files can be reduced by enabling the silence suppression. This is achieved by not writing data to disk when there is only silence in the voice calls. In this case, the size of the recorded media will depend on how much silence there is in the call, but the average reduction in the file size is 25%.

Silence suppression can be enabled in two ways:

Selecting a storage codec which supports silence suppression

There are several codecs which natively support silence suppression. This enables the size reduction of the recorded media files regardless of the recorded platform. The list of these codecs is the following:

  • Speex with silence suppression

  • High Quality Speex with silence suppression

  • Opus with silence suppression

  • High Quality Opus with silence suppression

Enabling the silence suppression (VAD) on the recorder service side

Verba also supports silence suppression on the recording service side. This is not available in the case of Skype for Business or passive recording. The VAD settings can be found under the Unified Call Recorder \ Media Recorder \ Media Splitting node in the server configuration.

Playback support

The system can also playback recordings in the following formats in addition to the above. These formats are usually applicable when the calls are migrated or imported from 3rd party systems.

  • WAVE G.723.1 Mono/Stereo 

  • WAVE G.729 Mono/Stereo 

  • WAVE G.722 Mono/Stereo 

  • WAVE G.726 Mono/Stereo

  • MP3

  • WMA

  • MP4 AAC

  • AU

  • VOX