Suggest mpeg compression on video and guide to clear the error mentioned below. Mpeg compression on video

Question

Aberna P 2023-4-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952689-suggest-mpeg-compression-on-video-and-guide-to-clear-the-error-mentioned-below-mpeg-compression-on

回答： Piyush Dubey 2023-9-15

采纳的回答： Piyush Dubey

Zigzag.m

for x = 0:((rowZigZag/(8*index))-1)

for y = 0:((columnZigZag/(8*index))-1)

Line 21: if(indicationIndex(x+1,y+1) ~= 1)

% Extracts 8x8 block which needs to be processed.

block = inputMatrix((x*8*index)+1:(x+1)*8*index, (y*8*index)+1:(y+1)*8*index);

Encoder.m

Line 217: [currentLumaDC, zigZagCurrentLumaAC] = zigZag(YQuantized, indicationMatrix, 2);

[currentCbDC, zigZagCurrentCbAC] = zigZag(CbQuantized, indicationMatrix, 1);

[currentCrDC, zigZagCurrentCrAC] = zigZag(CrQuantized, indicationMatrix, 1);

Error:

Index in position 2 exceeds array bounds (must not exceed 1).

Error in zigZag (line 21)

if(indicationIndex(x+1,y+1) ~= 1)

Error in Encoder (line 217)

[currentLumaDC, zigZagCurrentLumaAC] = zigZag(YQuantized, indicationMatrix, 2);

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Answer 1

Piyush Dubey 2023-9-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952689-suggest-mpeg-compression-on-video-and-guide-to-clear-the-error-mentioned-below-mpeg-compression-on#answer_1310796

Hi Aberna,

I understand that you are attempting to perform mpeg compression on video files but are encountering the “Index in position 2 exceeds array bounds.” error.

The error you are experiencing in the "Encoder.m" file suggests that there is an issue with the dimensions of the "indicationIndex" matrix. Specifically, the value “y+1” unexpectedly exceeds the range and fails to read the data. To address this issue, the code should be debugged, verifying the state and dimensions of the matrix. You may need to perform reshaping operations to ensure effective data access. Other errors mentioned in the console are likely stemming from the error on ‘line 21’.

Please refer to the following MathWorks documentation and File Exchange repository links for more information on MPEG compression and reshaping matrices: