Hi all
Im using DM6467 and dvsdk_3_10_00_19. In the past week,I saw that may be some strange thing with 720p codec.
In order to insert IDR frame, I modified video.c as this link said: http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/100/t/7826.aspx#31423
Then I got every frame bits like (with same camera's input):
frame_bytes=22982 Mean_QP=28 I_4x4=1255 I_16x16_*=2345 //SPS+PPS+IDR frame
frame_bytes=10795 Mean_QP=24 //P frame
frame_bytes=12334 Mean_QP=22 // P frame
frame_bytes=21 //SPS+PPS
frame_bytes=72185 Mean_QP=16 I_4x4=1865 I_16x16_*=1735 //IDR frame
frame_bytes=34776 Mean_QP=18 //P frame
frame_bytes=45537 Mean_QP=16 //P frame
frame_bytes=21 //SPS+PPS
frame_bytes=95709 Mean_QP=15 I_4x4=2025 I_16x16_*=1575 //IDR frame
frame_bytes=57266 Mean_QP=16 //P frame
frame_bytes=47552 Mean_QP=16 //P frame
frame_bytes=21 //SPS+PPS
frame_bytes=151765Mean_QP=12 I_4x4=2032 I_16x16_*=1568 //IDR frame
frame_bytes=88333 Mean_QP=14 //P frame
frame_bytes=56243 Mean_QP=16 //P frame
frame_bytes=21
frame_bytes=135943
frame_bytes=69246
frame_bytes=47163
As you see, the first IDR frame only has 22982 bytes, but the next two have 72185bytes and 95709 bytes. Is that normal?
If I make every pic as IDR frame , I get this:
frame bytes=32657 //IDR frame
frame bytes=12994 // I frame
frame bytes=16682 // I frame
frame bytes=21
frame bytes=78505 //IDR frame
frame bytes=72664 // I frame
frame bytes=62149 // I frame
frame bytes=21
frame bytes=62844 //IDR frame
frame bytes=62332 // I frame
frame bytes=55070 // I frame
frame bytes=21
frame bytes=55304 //IDR frame
frame bytes=54931 // I frame
frame bytes=55609 // I frame
frame bytes=21
frame bytes=55342 //IDR frame
frame bytes=55633 // I frame
frame bytes=55142 // I frame
This time, those bit rate drops but still has big gap with first IDR frame.
Could anyone know that and tell me what happen?
