How to re-insert Headers of container and audio again after strap them out using ffmpeq

Question

Hi, after using the following command to remove the container and audio headers from the i/p file in order to manipulate the I-frames, the output file won't be played, so my question is

how can I reverse the effect of the following line :

ffmpeg -i filename -an -vcodec copy -f rawvideo output_filename