Coding Tips

This works because the filename and data are stored separately. The filename can be unlinked, and the data will only be released once the file stream is closed. <verbatim> FILE *fd = fopen(“hidden.file”,“w”); unlink(“hidden.file”); fprintf(fd,“This is hidden information\n”); … fclose(fd); </verbatim>

<verbatim> % ffmpeg -loop_input -i image.jpg -r 29.97 -t 10 -qscale 2 video.mpg </verbatim> Where -t is the duration in seconds

<verbatim> % ffmpeg -i sound.mp3 -i video.avi final.avi </verbatim>

<verbatim> % ffmpeg -y -ss 1250 -t 81 -i input.dvr-ms -vcodec copy -acodec copy -f dvd out.mpg % ffmpeg -sameq -i out.mpg final.mp4 </verbatim> Where -ss is start time in seconds, -t is duration in seconds

<verbatim> % ffmpeg -i input_video.mkv -target ntsc-dvd -acodec mp2 -ab 192 -ac 2 -ar 48000 -b 4096 -r 29.97 -s 720×480 -vcodec mpeg2video -y output_video.mpg </verbatim>