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DM385: Bad Encoder Quality with Special Video scenes

andreas.geissler
Prodigy 170 points
Part Number: DM385

Hello,

i have a question again. I already created a forum entry ("DM385: Bad video stream quality for small GOP sizes"), which one I thought it was solved. But we figured out, that on very special video scenes we still have a bad video quality. So the last time we could only improved the quality by changing the profile but it is still not perfect.

We have used a generate test picture to have a high encoder load (This picture is still a video stream for the encoder 1080p @ 60fps). The effect is that for small GOP sizes on such a high load the quality gets worse. It seems that the effect directly corresponse to the GOP size. The stable test picture is changed on exactly the number of frames like the GOP size (see attachments), which means for example on a GOP size of 60 the effect occurs once per second, for 30 two times per second and so on. We could also see that this can happen on some special "real" video scenes like in https://www.youtube.com/watch?v=dVkK36KOcqs00:23 - 00:40 for example.

Does anyone have an idea what is causing that effect? Wrong configuration?

I have attached some videos with different GOP sizes using all the same target bitrate of 8000000, which are showing the issue.

And here are also my encoder configurations, which were used for generating that samples:

              
--------- Static Params -------   
 [m3video] Set dynamicParams VBR                                                
 [m3video] videnc2Params -> size                 : 312                          
 [m3video] videnc2Params -> encodingPreset       : 3                            
 [m3video] videnc2Params -> rateControlPreset    : 5                            
 [m3video] videnc2Params -> maxHeight            : 1080                         
 [m3video] videnc2Params -> maxWidth             : 1920                         
 [m3video] videnc2Params -> dataEndianness       : 1                            
 [m3video] videnc2Params -> maxInterFrameInterval: 1                            
 [m3video] videnc2Params -> maxBitRate           : 8000000                      
 [m3video] videnc2Params -> minBitRate           : 0                            
 [m3video] videnc2Params -> inputChromaFormat    : 9                            
 [m3video] videnc2Params -> inputContentType     : 0                            
 [m3video] videnc2Params -> operatingMode        : 1                            
 [m3video] videnc2Params -> profile              : 77                           
 [m3video] videnc2Params -> level                : 42                           
 [m3video] videnc2Params -> inputDataMode        : 3                            
 [m3video] videnc2Params -> outputDataMode       : 3                            
 [m3video] videnc2Params -> numInputDataUnits    : 1                            
 [m3video] videnc2Params -> numOutputDataUnits   : 1    


--------- Dynamic Params -------    
 [m3video]                                                                      
 [m3video] --------- CH 0 : H264 ENC : Dynamic Params -------                   
 [m3video]                                                                      
 [m3video] videnc2DynamicParams -> inputHeight             : 1080               
 [m3video] videnc2DynamicParams -> inputWidth              : 1920               
 [m3video] videnc2DynamicParams -> refFrameRate            : 25000              
 [m3video] videnc2DynamicParams -> targetFrameRate         : 60000              
 [m3video] videnc2DynamicParams -> targetBitRate           : 8000000            
 [m3video] videnc2DynamicParams -> intraFrameInterval      : 5                  
 [m3video] videnc2DynamicParams -> generateHeader          : 0                  
 [m3video] videnc2DynamicParams -> captureWidth            : 1920               
 [m3video] videnc2DynamicParams -> forceFrame              : -1                 
 [m3video] videnc2DynamicParams -> interFrameInterval      : 1                  
 [m3video] videnc2DynamicParams -> mvAccuracy              : 2                  
 [m3video] videnc2DynamicParams -> sampleAspectRatioHeight : 1                  
 [m3video] videnc2DynamicParams -> sampleAspectRatioWidth  : 1                  
 [m3video] videnc2DynamicParams -> ignoreOutbufSizeFlag    : 1                  
 [m3video] videnc2DynamicParams -> lateAcquireArg          : -1                 
 [m3video]                                                                      
 [m3video] rateControlParams -> rateControlParamsPreset        : 1              
 [m3video] rateControlParams -> scalingMatrixPreset            : 0              
 [m3video] rateControlParams -> rcAlgo                         : 0              
 [m3video] rateControlParams -> qpI                            : -1             
 [m3video] rateControlParams -> qpMaxI                         : 44             
 [m3video] rateControlParams -> qpMinI                         : 8              
 [m3video] rateControlParams -> qpP                            : -1             
 [m3video] rateControlParams -> qpMaxP                         : 44             
 [m3video] rateControlParams -> qpMinP                         : 8              
 [m3video] rateControlParams -> qpOffsetB                      : 4              
 [m3video] rateControlParams -> qpMaxB                         : 44             
 [m3video] rateControlParams -> qpMinB                         : 10             
 [m3video] rateControlParams -> allowFrameSkip                 : 1              
 [m3video] rateControlParams -> removeExpensiveCoeff           : 0              
 [m3video] rateControlParams -> chromaQPIndexOffset            : 0              
 [m3video] rateControlParams -> IPQualityFactor                : 0              
 [m3video] rateControlParams -> initialBufferLevel             : 16000000       
 [m3video] rateControlParams -> HRDBufferSize                  : 16000000       
 [m3video] rateControlParams -> minPicSizeRatioI               : 0              
 [m3video] rateControlParams -> maxPicSizeRatioI               : 96             
 [m3video] rateControlParams -> minPicSizeRatioP               : 0              
 [m3video] rateControlParams -> maxPicSizeRatioP               : 0              
 [m3video] rateControlParams -> minPicSizeRatioB               : 0              
 [m3video] rateControlParams -> maxPicSizeRatioB               : 0              
 [m3video] rateControlParams -> enablePRC                      : 1              
 [m3video] rateControlParams -> enablePartialFrameSkip         : 1              
 [m3video] rateControlParams -> discardSavedBits               : 1              
 [m3video] rateControlParams -> VBRDuration                    : 8              
 [m3video] rateControlParams -> VBRsensitivity                 : 0              
 [m3video] rateControlParams -> skipDistributionWindowLength   : 5              
 [m3video] rateControlParams -> numSkipInDistributionWindow    : 2              
 [m3video] rateControlParams -> enableHRDComplianceMode        : 1              
 [m3video] rateControlParams -> frameSkipThMulQ5               : 0              
 [m3video] rateControlParams -> vbvUseLevelThQ5                : 0              
 [m3video]                                                                      
 [m3video] interCodingParams -> interCodingPreset  : 0                          
 [m3video] interCodingParams -> searchRangeHorP    : 144                        
 [m3video] interCodingParams -> searchRangeVerP    : 32                         
 [m3video] interCodingParams -> searchRangeHorB    : 144                        
 [m3video] interCodingParams -> searchRangeVerB    : 16                         
 [m3video] interCodingParams -> interCodingBias    : 1                          
 [m3video] interCodingParams -> skipMVCodingBias   : 1                          
 [m3video] interCodingParams -> minBlockSizeP      : 0                          
 [m3video] interCodingParams -> minBlockSizeB      : 0                          
 [m3video] interCodingParams -> meAlgoMode         : 0                          
 [m3video]                                                                      
 [m3video] intraCodingParams -> intraCodingPreset          : 0                  
 [m3video] intraCodingParams -> lumaIntra4x4Enable         : 255                
 [m3video] intraCodingParams -> lumaIntra8x8Enable         : 0                  
 [m3video] intraCodingParams -> lumaIntra16x16Enable       : 15                 
 [m3video] intraCodingParams -> chromaIntra8x8Enable       : 15                 
 [m3video] intraCodingParams -> chromaComponentEnable      : 1                  
 [m3video] intraCodingParams -> intraRefreshMethod         : 0                  
 [m3video] intraCodingParams -> intraRefreshRate           : 0                  
 [m3video] intraCodingParams -> gdrOverlapRowsBtwFrames    : 0                  
 [m3video] intraCodingParams -> constrainedIntraPredEnable : 0                  
 [m3video] intraCodingParams -> intraCodingBias            : 0                  
 [m3video]                                                                      
 [m3video] sliceCodingParams -> sliceCodingPreset  : 1                          
 [m3video] sliceCodingParams -> sliceMode          : 416                        
 [m3video] sliceCodingParams -> sliceUnitSize      : 416                        
 [m3video] sliceCodingParams -> sliceStartOffset   : [-126 1 2]                 
 [m3video] sliceCodingParams -> streamFormat       : 0                          
 [m3video]                                                                      
 [m3video] sliceGroupChangeCycle           : 3072                               
 [m3video] searchCenter                    : 0                                  
 [m3video] enableStaticMBCount             : 0                                  
 [m3video] enableROI                       : 262400                             
 [m3video]                                                                      
 [m3video]                                            

Regards,

Andreas

Attachments:

Test picture with GOP 5:

Test picture with GOP 20:

Test picture with GOP 60:

  • 0
    Mastermind 8775 points

    Hi Andreas,

    I have few questions & suggestions for you.

    Q1. Do you want Baseline/Main Profile or Can you switch to HIGH PROFILE? If yes, I suggest you to switch to HIGH Profile.

    Q2. In the streams I see, IDR frame. Will it be okay to use I frames instead IDR?

    Q3. Can you brief me on your use case with GOP 5, In other words, why GOP5 is been used?

    Q4. Can you share the input you used for encoding these streams, I can tune and provide you a better config.

    Q5. Do you need Slices in the encoded frame? If yes, how many slices do you need? I see sliceCodingPreset  Enabled.

    Q6. Which SDK are you using? The version of H.264 Encoder? It can be found in the encoder Release Notes.

  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points

    Hi Prashanth,

    Thanks for that fast replay. Here are the answers to your questions:

    A1. Yes we can and we will switch to the high profile. But I was a little bit confused, that a colleague wrote in his commit message that HIGH profile is not supported. Can you confirme that there is no problem with the HIGH profile for the DM385 with the used SDK (see A6)?

    A2. A4. We have the following restrictions

    Video Encoding Format

      • (Contrained base profile) <= we already have talked with the customer that we need the violate this requirment
      • Level 4.2
      • SPS pic order cnt type = 0
      • SPS max num ref frames = 1
      • PPS bottom field pic order in frames present flag = 1
      • PPS num ref idx I0 default active minus 1 = 0
      • No VUI
      • IDR slices: type 7
      • Non-IDR slices: type 5

    The SPS and PPS shall be sent every second to support fast switching of video inputs, resolutions and
    framerates.

    A3. There is no need to use GOP5. We used that only for testing purpose. We are not very familiar with video encoding and we were not sure what is a good value for GOP. I found many conversations about that, but we found out that for our most use cases a value between 30 and 60 returns good results. We need a configuration, with that ANY video stream with 1080p @ 60fps can be encoded with a data rate about 8 MBit and with the best quality under that constraints.

    A5. I will provide the test picture to you when i have the agreement from the creator.

    A6.

    DVR Reference Design version GA-04.00.00.03.
    H.264 Encoder 02.00.04.01 Yes (for M3 standalone apps)
    H.264 Decoder 02.00.08.00 Yes (for M3 standalone apps)

    Thanks,

    Andreas

  • 0 in reply to andreas.geissler
    Mastermind 8775 points

    Hello Andreas,

    Thanks for these details. Please find the replies below:

    andreas.geissler said:
    A1. Yes we can and we will switch to the high profile. But I was a little bit confused, that a colleague wrote in his commit message that HIGH profile is not supported. Can you confirme that there is no problem with the HIGH profile for the DM385 with the used SDK (see A6)?

    Great. Lets stick to HIGH PROFILE. Its supported.

    andreas.geissler said:
    A5. I will provide the test picture to you when i have the agreement from the creator.

    Sure. Not a problem. 

    andreas.geissler said:

    A6.

    DVR Reference Design version GA-04.00.00.03.
    H.264 Encoder 02.00.04.01 Yes (for M3 standalone apps)
    H.264 Decoder 02.00.08.00 Yes (for M3 standalone apps)

    A6. Says.. Encoder version 02.00.04.01 & Decoder  02.00.08.00 are pretty old.

    I suggest you to switch to the latest versions and try them at your side and share me your observation. Lest concentrate on other points(A2-A4) after moving to latest codec versions.

    Latest H.264 Encoder is 02.00.09.00 & H.264 Decoder is 02.00.20.00. Please contact your local FAE and he/she should provide you these packages.

  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points

    I will try to get the newest version of the H.264 Encoder and H.264 Decoder. But this will take some time to integrate this.

    And I got permission to publish the test picture. So here it is:

    I will inform you when the encoder is up to date.

    Regards,

    Andreas

  • 0 in reply to andreas.geissler
    Mastermind 8775 points
    Andreas,
    Thanks. Do you use this still image for Encoding? Should that be fine if I take this as input for my encoder? The encoded streams shared by you in first post doesn't have any motion. If yes, I shall work on the best configuration for your requirement.

    Also thanks for open to integrating the latest codec version. Its highly recommended to migrate to latest versions.
  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points

    Yes I am using this still image for Encoding. And of course you can use that as your input, but it is already compressed by our encoder so I am not sure how this effects the results.

    That would be really nice if you could give us a configuration with better results, under considering the given requirements

  • 0 in reply to andreas.geissler
    Mastermind 8775 points

    Andreas,

    60 fps @ 8MBPS bit-rate is a complex thing. Let me know if you are fine with 30fps. 

  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points
    Hi,
    We have a requirement to support 1080p @ 60 fps but there is no fixed requirement for the 8MBPS. What is a realistic value for the bit rate to support 1080p@60fps?

    Regards,
    Andreas
  • 0 in reply to andreas.geissler
    Mastermind 8775 points

    Andreas,

    For 1080p@60, its better if you have 16MBPS. If you are open to increase the bitrate still further quality will get better. For real time 1080p,60 you can use aroudn 16-20MBPS.

    PFA for the configuration. Let me know if you need anything else.1080p_Quality_Tune.cfg

  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points
    Thanks for your help Prashanth.
    I will apply this configuration and update the H264 encoder and inform you about the results. but as i said this will take some time.

    Thanks a lot!

    Regards,
    Andreas
  • 0 in reply to andreas.geissler
    Mastermind 8775 points
    Thanks Andreas,
    Let me know if you face any similar issue with latest codecs once after you integrate them. We can tune the cfg further.
  • 0 in reply to andreas.geissler
    Prodigy 170 points

    Hello Prashanth,

    I have got the new encoder software now, extracted from the ipnc_rdk-3.9.1. But now I get the following error message when tring to compile to image:

    fatal error: file
       "/mnt/1424_LHT_Nice/dvrrdk_04.00.00.03/dvr_rdk/../ti_tools/codecs/REL.500.V.
       H264AVC.E.IVAHD.02.00.09.01/500.V.H264AVC.E.IVAHD.02.00/IVAHD_001/Lib/h264en
       c_ti_host.lib<H264BPEnc_ti_ires.obj>" has a Tag_ABI_PCS_wchar_t attribute
       value of "4" that is different than one previously seen ("2"); combining
       incompatible files

    I have replaced the h264enc_DIR: REL.500.V.H264AVC.E.IVAHD.02.00.04.01 with REL.500.V.H264AVC.E.IVAHD.02.00.09.01 in the Rules.make. What does this error means? Are there any other dependencies?

    And could you provide me your test results with your encoder environment. Just to see the difference between the results of our encoder and yours?

    Regards,

    Andreas

  • 0 in reply to andreas.geissler
    Mastermind 8775 points

    Hi Andreas,

    Can you use H.264 Encoder version 02.00.09.00? This is the latest codec version compatible for your setup.

    Version 02.00.09.01is compiled with different CG-Tools version.

    I will share the encoded bit-stream shortly.

  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points

    Hi Prashanth,

    Thank you. With the H.264 Encoder version 02.00.09.00 I can build the image now. I will do some tests, to check the differences. I will report again, when I have the results.

    Regards,

    Andreas

  • 0 in reply to andreas.geissler
    Mastermind 8775 points

    Hi Andreas,

    PFA for the sample encoded stream. This is elementary  h264 stream. Rename it to .2641080p_Quality_Tune.264.txt

  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points

    Hi Prashanth,

    Thanks for the sample encoded stream. But also in that Video stream you can see that in the frequency of the GOP size the Frame is pulsing. Is there a possibility to avoid that pulsing?

    We made also some test with the new Encoder Version, and with a part of the parameters adjusted. But the effect is not so big. We can see slightly differences, but the pulsing is still to be seen. It is better but not perfect.

    I had some Problems to find all Parameters of the Encoder.

    Some of the Parameters are not part of the EncLink_CreateParams structure in that dvrrdk Version and some paramters are also missing in the encLink_h264.c or I just can not find them.

    All Parameters which I currently did not configured are in the attached file.

    Regards,

    Andreas

    not_configured.txt 
    ##########################################################################################
# Encoder Control
##########################################################################################
NumInputUnits            = 600       # Total number of frames to encode 
NumOutputUnits           = 1        # Number of units of output-data (ex. 1 Slice/Frame encoded stream).
dataLayout               = 0        # input data buffer layout 0=> interleaved, 1=> seprated. Applicable only for interlace content. 
captureHeight            = 1080      # Image capture height
captureTopLeftx          = 0        # Exact source position of the pixel to encode in input buffer X direction 
captureTopLefty          = 0        # Exact source position of the pixel to encode in input buffer Y direction 

###########################################################################################
# InterCoding Control
###########################################################################################
searchCenter_x           = 32767    # Search center for Motion estimation i.e global motion vector in X dir. For best video quality, set this to 32767 so that Codec will set searchCenter_x and searchCenter_y at internally computed global offset. 
searchCenter_y           = 0        # Search center for Motion estimation i.e global motion vector in Y dir

############################################################################################
# Loop Filter Control
############################################################################################
loopfilterPreset         = 0        # Preset value for loop filter operation parameters, 0 => deafult values, 1 => user defined
loopfilterDisableIDC     = 0        # Disable H.264 loop filter, (0=Filter, 1= NoFilter, 2 = No loop filter across slices)
filterOffsetA            = 0        # Alpha offset for loop filter 
filterOffsetB            = 0        # Beta offset for loop filter 

############################################################################################
# Entropy Coding Mode
############################################################################################
entropyCodingMode        = 1        # Enropy coding type, (0 => CAVLC, 1 => CABAC)

################################################################################
# VUI Control Params
################################################################################
vuiCodingPreset            = 0      # Preset value for VUI Control Params, 0 => deafult values, 1 => user defined
aspectRatioInfoPresentFlag = 1      # Controls the insertion of aspect ratio information in VUI part of bit-stream 
aspectRatioIdc             = 1      # Aspect ratio ID 
videoSignalTypePresentFlag = 0      # controls the insertion of video signal type in VUI part of bit-stream 
videoFormat                = 2      # Video signal type 
videoFullRangeFlag         = 0      # Flag to specigy Range of the pixels 
timingInfoPresentFlag      = 1      # Controls the insertion of timing info related parameters in VUI part of bit-stream 

################################################################################
# NALU Control Params
################################################################################
naluControlPreset              = 0     # Preset value for NALU Control Params, 0 => deafult values, 1 => user defined
naluPresentMaskStartOfSequence = 416   # Controls the insertion of different NALU at start of sequence
naluPresentMaskIDRPicture      = 416   # Controls the insertion of different NALU at IDR picture
naluPresentMaskIntraPicture    = 2     # Controls the insertion of different NALU at Intra picture(s)
naluPresentMaskNonIntraPicture = 2     # Controls the insertion of different NALU at Non-intra pictures
naluPresentMaskEndOfSequence   = 3072  # Controls the insertion of different NALU at end of sequence

################################################################################
# STEREO INFO Control Params
################################################################################
stereoInfoPreset           = 0    # Preset controls the Enable/Disable of Stereo Videoc Coding, 0 => Disable, 1 => Default Frame packing SEI parameters, 2 => User defined
topFieldIsLeftViewFlag     = 1    # Controls top field in video coded sequence as a left view or right view, 0 => Top field is Left View, Non-Zero => Top field is Right view
viewSelfContainedFlag      = 0    # Controls the Left/Right view should refer Left view or Right view, 0 => Leftview can refer to Rightview or Leftview & Rightview can refer to Rightview or Leftview, Non-Zero => Leftview can refer only to Leftview & Rightview can refer only to Rightview

################################################################################
# Frame Packing SEI Params
################################################################################
framePackingPreset  = 0  # Preset controls the Enable/Disable of Frame packing SEI message encoding, 0 => Disable, 1 => Default Frame packing SEI parameters, 2 => User defined
framePackingType    = 3  # Indicates that frame packing arrangement type, 0 => Checker board arrangement of 2 views, 1 => Column interleaving arrangement of 2 views, 2 => Row interleaving arrangement of 2 views, 3 => Side by side arrangement of 2 views, 4=> Top-Bottom arrangement of 2 views
frame0PositionX     = 0  # Location of the upper left sample of frame 0(Left view) in horizontal direction
frame0PositionY     = 0  # Location of the upper left sample of frame 0(Left view) in vertical direction
frame1PositionX     = 0  # Location of the upper left sample of frame 1(Right view) in horizontal direction
frame1PositionY     = 0  # Location of the upper left sample of frame 1(Right view) in vertical direction
reservedByte        = 0  # Value of frame_packing_arrangement_reserved_byte syntax element

################################################################################
# H-P Coding Control Params
################################################################################
numTemporalLayer     = 1    # 1 => 1layer , 2 => 2layers,3=> 3layers,4 => 4layers
referencePicMarking  = 1    # 0 =>Short-term referencing(Sliding Window),1=> Long term referencing(MMCO Commands)

################################################################################
# MISC
################################################################################
gopStructure             = 0        # GOP structure, 0 => Open or Non uniform(IBBPBBP), 1 => Closed or Uniform (BBIBBPBB) 
IDRFrameInterval         = 0        # Interval b/w two IDR frames 
bottomFieldIntra         = 0        # 1 : Force bottom field of Intra frame as Intra field, 0: bottom field as inter (default)
transformBlockSize       = 2        # Tranform type, 0:4x4 only, 1: 8x8 only, 2:Adaptive (default)  
log2MaxFNumMinus4        = 8        # sliceParams::frame_num syntax element will be reset after every (1<< (log2MaxFNumMinus4 + 4)) frames
picOrderCountType        = 0        # Picture order count type, supported value 0,1 and 2 
topFieldFirstFlag        = 1        # Flag to indicate field order in interlaced content 
interlaceCodingType      = 3        # Interlced field coding type selection, 2 => MRF 3=> ARF 4=> SPF
forceIDRPeriod           = 100000   # ForceIDRPeriod specified by user to control encoding
forceSKIPPeriod          = 100000   # Skip frame interval
enableLongTermRefFrame   = 0        # Parameter is used to support long-term reference frame, 0 => Disable, Non-Zero => Enable
enableWatermark          = 0         # Flag to enable water marking

##########################################################################################
# ROI Parameters
##########################################################################################
enableROI               = 0           # 0->disable ROI 1-> enable ROI
ROIcfg                  = "..\..\..\Test\TestVecs\Config\roiInputParams.cfg"

  • 0 in reply to andreas.geissler
    Mastermind 8775 points

    Hi Andreas,

    andreas.geissler said:

    But also in that Video stream you can see that in the frequency of the GOP size the Frame is pulsing. Is there a possibility to avoid that pulsing?

    Yes, Slight pulsing is seen initial 1 second(1st GOP Frequency) in the video shared. After that no pulsing is seen with 16MBPS bitrate @ 60fps. Will get back to you on this.

    andreas.geissler said:

    Some of the Parameters are not part of the EncLink_CreateParams structure in that dvrrdk Version and some paramters are also missing in the encLink_h264.c or I just can not find them.

    The params which you did not find can be ignored, because most of them will be set to default(preset values are set to 0,so the default settings will be set internally) by the codec itself. You can get the details of all the params in Client\test\src\h264enc_ti_config.c & also in inc\ih264enc.h

  • 0 in reply to Prashanth Kumar15
    Mastermind 8775 points
    Hi Andreas,
    Can set these below and check weather you still see pulsing?

    maxBitRate = 2*targetBitrate;
    encodingPreset = XDM_MED_SPEED_HIGH_QUALITY;
    qpMaxI = 30;
    qpMaxP = 44;
  • 0 in reply to Prashanth Kumar15
    Prodigy 170 points

    Hi Prashanth,

    Thanks!

    Yes this seems to improve the quality!

    Old version (Targetbitrate 8MBit):

    New version with encodingPreset = XDM_MED_SPEED_HIGH_QUALITY (Targetbitrate 8MBit):

    It looks much better. But i need that confirmed by the customer. I will inform you, if this also improves his life stream video encoding.

    Regards,

    Andreas