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The MPEG4 Encoder object is intended for recording an archive in MPEG4 format. If the object is not created, then by default the archive is recorded in the same codec in which the video signal is received.
The MPEG4 Encoder object is created under the Camera object, the video archive of which must be stored in this codec.
Right after the MPEG4 Encoder object is created, the current archive fragment is finalized and the new fragment starts to be recorded in the MPEG4 codec.
Setting up the MPEG4 Encoder object consists in setting the Image quality index parameter: it affects the archive video bit rate and, therefore, the size of the resulting archive file. The larger the index, the higher the image quality and the larger the archive file size. The default value of 3 allows acceptable bit rate for various video resolutions.
See the tables below for the dependence of archive video characteristics on the value of the Image quality index parameter.
Codec H264, resolution 1920x1080
| Image quality index | Size, Mb | Duration, sec. | Bitrate, kbps. | Quality, % |
|---|---|---|---|---|
| 1 | 15 | 60 | 2048 | 17% |
| 2 | 29,7 | 60 | 4055 | 33% |
| 3 | 44,6 | 60 | 6089 | 50% |
| 4 | 59,4 | 60 | 8110 | 67% |
| 5 | 74,2 | 60 | 10130 | 83% |
| 6 | 89,1 | 60 | 12165 | 100% |
Codec H264, resolution 1280x720
| Image quality index | Size, Mb | Duration, sec. | Bitrate, kbps. | Quality, % |
|---|---|---|---|---|
| 1 | 6,68 | 60 | 912 | 23% |
| 2 | 13,2 | 60 | 1802 | 46% |
| 3 | 19,9 | 60 | 2717 | 69% |
| 4 | 26,5 | 60 | 3618 | 91% |
| 5 | 28,6 | 60 | 3904 | 99% |
| 6 | 29 | 60 | 3959 | 100% |
Codec H264, resolution 640x480
| Image quality index | Size, Mb | Duration, sec. | Bitrate, kbps. | Quality, % |
|---|---|---|---|---|
| 1 | 2,3 | 60 | 314 | 26% |
| 2 | 4,7 | 60 | 641 | 53% |
| 3 | 6,9 | 60 | 946 | 78% |
| 4 | 8,7 | 60 | 1190 | 98% |
| 5 | 8,8 | 60 | 1213 | 100% |
| 6 | 8,9 | 60 | 1217 | 100% |
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