H.264 convert from bitstream to bytestream [annex b]

[aviadr1]

Hi,
as $subj
I tried just replacing the 4-byte nal-size with an 00 00 00 01 startcode but it didnt work.

does anyone have sample code to do this conversion or can explain what I'm missing?

Aviad

[Guest]

Perhaps you nade a coding error (such as assuming that the length value includes the length field).

I do the same thing to support MKV files. For each extracted frame (b points to the extracted frame buffer), I do this:

// Convert to Annex B NALUs if necessary.
p = b;
while (p < (unsigned char *) b + FrameSize)
{
nalu_len = (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3];
p[0] = 0;
p[1] = 0;
p[2] = 0;
p[3] = 1;
p += (nalu_len + 4);
}

[aviadr1]

it works, thanks!