H.264 stream header

Question

I have corrupted video stream with this header / parameters in the beginning.

00 00 00 01 67 64 00 1E AC D9 40 B0 33 FB C0 44  
00 00 03 00 04 00 00 03 00          


        

Answer 1

You will find answers here:

• How to decode sprop-parameter-sets in a H264 SDP?
• Parsing Rtsp response parameter that is sprop-parameter-sets
• Fetching the dimensions of a H264Video stream

Your data decodes like this:

Sequence Parameter Set

profile_idc 100 
constraint_set0_flag 0 
constraint_set1_flag 0 
constraint_set2_flag 0 
constraint_set3_flag 0 
level_idc 30 
seq_parameter_set_id 0 
chroma_format_idc 1 
// ... 
num_ref_frames 4 
gaps_in_frame_num_value_allowed_flag 0 
pic_width_in_mbs_minus1 43 
pic_height_in_map_units_minus1 24 
frame_mbs_only_flag 1 
direct_8x8_inference_flag 1 
frame_cropping_flag 1 
frame_crop_left_offset 0 
frame_crop_right_offset 0 
frame_crop_top_offset 0 
frame_crop_bottom_offset 2 
vui_parameters_present_flag 1 
// ... 

Picture Parameter Set

pic_parameter_set_id 0 
seq_parameter_set_id 0 
entropy_coding_mode_flag 1 
num_slice_groups_minus1 0 
// ... 

Answer 2

If frame_cropping_flag is 1, to get the dimensions you do:

width = ((pic_width_in_mbs_minus1 +1)*16) - frame_crop_left_offset*2 - frame_crop_right_offset*2;
height= ((2 - frame_mbs_only_flag)* (pic_height_in_map_units_minus1 +1) * 16) - (frame_crop_top_offset * 2) - (frame_crop_bottom_offset * 2)