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DM365 H264 Platinum Encoder Multiple Slices

mdw
Prodigy 230 points

Hello,

could you kindly help me to configure the encoder to output data stream in multpile slices.

Platform:
DM365
DVSDK 2.10.1.18
H264 Platinum encode 2.0.0.10
Resolution: QVGA

I configured H264 encoder to output 15 MBs per slice:
.entropyMode=0 //CAVLC
.sliceMode=2 //MBs per slice
.outputDataMode=1 //byte stream format
.sliceSize=15 //one row for QVGA

Here is the dump of both static and dynamic configuration structs:
1261.enc_params.txt


however, the first (IDR) frame (for example) consists of 2 Non VLC slices, and one large VLC slice.
I expected (please correct me if I am wrong), to get a sequence of NAL units delimited by 0x0000001 headers, where each NALU contains 1 MB row.

Unfortunately, I failed to find any information regarding how to configure the slicing feature (encoder user guide, TI's wike etc).



Thank you in advance.

  • 0
    TI__Expert 8465 points

    Hi Nequam,

    In slicemode = 2, Slice size should be multiple of 2 . If you set slice size non-multiple of 2 encoder will return proper error code (IH264VENC_ERR_SLICESIZE)

    Encoder user guide has information( NOTE section page No. 4-49)  about how to configure slice size. And QVGA(320x240) has 20MBs per row.

    and soon TI will update wiki topic about slicing feature configuration.

     

    Thanks,

    Veeranna

  • 0 in reply to Veeranna Hanchinal
    TI__Expert 8465 points

    Hi 

    If you want One row per slice, alternatively  you can also use slicemode = 3(rows per slice) and slicesize = 1(one row per slice), 

  • 0 in reply to Veeranna Hanchinal
    Prodigy 230 points

    Dear Veeranna,

    I am sorry, 15 MBs is a typo. As you can see from configuration dump attached to the question message I configure it to 20.


    Encoder is initialized successfully, and even encodes a frame, however as I can see it outputs a single VLC NAL.

    Perhaps, we use different user guide version. In mine, taken from the codec 2.0.0.10 h264/docs folder (SPRUEU9C, Audust 2010),
    page 4-49 contains 4.2.2.6 IH264VENC_Fxns topic. Where can I get the newer version of the user guide.

    Am I right, expecting the encoder to output frames divided to NAL units delimited by 0x0000001?

    Thank you in advance.

  • 0 in reply to mdw
    TI__Prodigy 635 points

    Hi Nequam,

    What you are expecting is correct.

    But one thing you should note is MBs based slices are supported only in encQuality = 0 mode.

    Looking at your settings I see that encodingPreset =1 which results in encQuality = 2, in which there is no support for MBs based slices and will be turned off internally. When encodingPreset =1 it overrides the encQuality flag. So you are not seeing any slices at your end.

    Two things you can do is,

    Change encodingPreset  to 3 and encQuality = 0. This enables MBs based slices

    or

    As Veeranna suggested use sliceMode = 3

    Rgds, mahant

  • 0 in reply to Mahant S
    Prodigy 230 points

    Dear Mahant and Veeranna,

     

    thank you for your help. Now it works.

     

    Best regards.