How to recognize I and P frames while reading an encoded video
While reading bytes from the encoded video how can I know is it for I frame or P frame?
Anyone, please tell me how to identify this?
See also questions close to this topic
Supporting dependency of P frame on I frame only
I have a doubt on x264 encoding.
If I have IP_1P_2P_3 IPPP some kind of this GOP from the x264 encoded output. Then in general, P_3 will be dependent on I, P_1 and P_2, P_2 will be dependent on I and P_1 (a cumulative encoding).
Can anyone please give me any ideas how can I support direct encoding so that all P_1, P_2, P_3 will be only dependent on the I frame?
Getting An Indexed Color Table to Encode Custom Filetype FFmpeg
I am messing with a custom image format to be supported in FFmpeg with a custom encoder and decoder. In order to encode images, it seems like using an indexed color table is a good approach, but I am unsure if this is something that FFmpeg can already provide me or if this is something that I will have to build functionality for myself.
Does FFmpeg have built-in functionality to get an indexed color table from an input stream?
If so, what are they?
If not, are there any good resources to learn about the best way to do this?
P frame dependencies and NAL value
Can anyone please tell me what is the difference between this two encoded outputs (N.B. the inputs are same, and the parameters I used while encoding are also same)?
For the first set I am getting the NAL value =2 for P frame. for 2nd set I am getting the NAL value for P frames = 0.
Can anyone tell me which one is possibly cumulatively encoded and which one is directly encoded means P frames only dependent on I frame not on previous P frames.
x264 [debug]: frame= 0 QP=28.71 NAL=3 Slice:I Poc:0 I:32768 P:0 SKIP:0 size=335621 bytes x264 [debug]: frame= 1 QP=29.62 NAL=2 Slice:P Poc:2 I:1028 P:14500 SKIP:17240 size=60797 bytes x264 [debug]: frame= 2 QP=30.29 NAL=2 Slice:P Poc:4 I:962 P:13307 SKIP:18499 size=61788 bytes x264 [debug]: frame= 3 QP=30.30 NAL=2 Slice:P Poc:6 I:905 P:13260 SKIP:18603 size=62136 bytes x264 [debug]: frame= 4 QP=26.45 NAL=3 Slice:I Poc:0 I:32768 P:0 SKIP:0 size=435864 bytes
x264 [debug]: frame= 0 QP=28.70 NAL=3 Slice:I Poc:0 I:32768 P:0 SKIP:0 size=335363 bytes x264 [debug]: frame= 1 QP=33.38 NAL=0 Slice:P Poc:2 I:924 P:11507 SKIP:20337 size=37314 bytes x264 [debug]: frame= 2 QP=33.28 NAL=0 Slice:P Poc:4 I:1518 P:13596 SKIP:17654 size=55535 bytes x264 [debug]: frame= 3 QP=33.27 NAL=0 Slice:P Poc:6 I:2211 P:14007 SKIP:16550 size=70488 bytes x264 [debug]: frame= 4 QP=26.45 NAL=3 Slice:I Poc:0 I:32768 P:0 SKIP:0 size=436369 bytes