UMP (Unified Media Platform)

4.5 Re-encoding Videos

 

Besides offering the possibility to record and play back videos, the UMP is designed to be as flexible as possible, and provides a facility of re-encode video, either to play back on the UMP itself, or on other portable device. A UMP-XXX is just about capable of rendering 1080i WMV-HD and some tearing and/or frame dropping will occur during playback. This is where the re-encoding function comes in: Even though a piece of video material may not play back correctly, the UMP can re-encode it into a compatible format. The usage of the re-encoding function is typically used in the following situations:

 

-         You have a video file of an unsupported type for playback, to high resolution or a combination of both.

 

-         You have a 3rd party application or device that cannot play the media in its current form.

 

-         You wish to keep your video items in a certain format or enforce certain characteristics throughout a number of files.

 

To re-encode a video, navigate to it in one of the Video Menu’s submenus, and press the Blue color button on the remote control to open the Action Menu. In the Action Menu, select Transcode this Program. This will open the Transcode screen where an overview of the various settings is displayed.

 

The following parameters are listed in the Info area of the screen:

 

-         Title

-         Filename

-         Container

-         Resolution

-         Video Codec

-         Video Rate

-         Audio Codec

-         Audio Rate

-         Num Passes

 

These settings are the defaults for the selected encoding profile. If you select Start Encoding at the bottom, a re-encoded copy of the selected item will be created in the background. You can play the original file back or any other file at this time.


 

4.5 Re-encoding Videos (continued)

 

Although the default encoding profile is recommended, you can alter its settings in the Web Interface under Settings -> All -> Reencode:

 

 

REENCODE_CONTAINER = 'avi'

 

The ‘file format’ to be used for the output file.

 

REENCODE_RESOLUTION = 'Optimal'

 

The resolution to be used for the output file. Enter either a resolution (‘640x480’) or ‘Optimal’.

 

REENCODE_VIDEOCODEC = 'XviD'

 

The video codec to use for the output file.

 

REENCODE_VIDEOBITRATE = 800

 

The bitrate to be used for the video codec.

 

REENCODE_AUDIOCODEC = 'MPEG 1 Layer 3 (mp3)'

 

The audio codec to be used for the soundtrack

 

REENCODE_AUDIOBITRATE = 128

 

The bitrate to be used for the audio codec.

 

REENCODE_NUMPASSES = 1

 

The number of passes to be executed by the encoding service.

 

REENCODE_VIDEOFILTER = None

 

The filter to be used for the video codec.



4.5 Re-encoding Videos (continued)

 

As discussed previously, the default encoding profile does not need to be used. Any combination of the various settings is allowed. The following output formats are supported:

 

 

XviD Low Quality

XviD, RES: Optimal, V-BR: 800, MP3, A-BR: 128, NP: 1

XviD High Quality

XviD, RES: Optimal, V-BR: 1200, MP3, A-BR: 128, NP: 2

iPod

MP4, RES: 320x240, V-BR: 1200, AAC, A-BR: 192, NP: 2

DVD

MPEG2 LAVC, RES: 720x480, V-BR: 5200, AC-3, A-BR: 224, 1

 

You can of course specify your own settings on the fly. Note that apart from re-encoding material, the re-encode function offers the possibility to leave either the sound or the video track unchanged, and simply copies it to the resulting output file.

The following codecs and formats are available:

 

 

Containers

AVI, MP4, MPEG

Resolution:

1920x1080, 1280x720, 852x480, 720x576, 720x480, 320x240

Video Codec:

MPEG 4 (LAVC), MPEG 4 (LAVC fast), MPEG2 (LAVC), XviD, H.264, copy

Video Bitrate:

400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000

Audio Codec:

MPEG 1 layer 3 (MP3), MPEG 1 layer 2 (MP2), AAC (iPod), AC3, Vorbis, copy

Audio Bitrate:

64, 128, 192, 224

Number of Passes:

1, 2

Number of Encoding Threads:

1, 2, 3, 4, 5, 6, 7, 8

Video Filters:

Denoise, iPod, Inverse Telecine, Deinterlacing, None

 

 

Note that re-encoding video can take a long time, depending on the nature of the source files, the desired output settings and the other tasks running on the device. After changing any of these settings, you will need to restart the UMP for the settings to take effect.