FiW
20th July 2002, 11:55
what calculate .avi overhead? and... overhead for ac3 sound (depending on delays in ms)? and...
if movie 200000frames, 23,976fps, ac3 448kbps - i calculate ac3 size in KBytes - 448 * 1000 / 8 * 200000 / 23,976 / 1024 = 456185. why GKnot tell me - 456203 Kbytes?
if movie 200000frames, 25fps, ac3 448kbps - i calculate ac3 size in KBytes - 448 * 1000 / 8 * 200000 / 25 / 1024 = 437500. GKnot tell me - 437500 Kbytes. :D
if movie 123456frames, 25fps, ac3 448kbps - i calculate ac3 size in KBytes - 448 * 1000 / 8 * 123456 / 25 / 1024 = 270060. why GKnot tell me - 270047 Kbytes?
* edit
in xvid src i found it
// compensate for avi frame overhead
desired -= frames * 24;
new question
frames: 123456 / fps: 23,976 / interleave: 96ms / ac3: 256kbps / 1cd
sizes:
audio: 256 * 1000 / 8 * 123456 / 23,976 = 164772773 bytes
audio-oh: 24 * 123456 / 23,976 * 1000 / 96 = 1287287 bytes
video-oh: 24 * 123456 = 2962944 bytes
video: 734003200 - 164772773 - 1287287 - 2962944 = 564980196 bytes
so it is correct?
if movie 200000frames, 23,976fps, ac3 448kbps - i calculate ac3 size in KBytes - 448 * 1000 / 8 * 200000 / 23,976 / 1024 = 456185. why GKnot tell me - 456203 Kbytes?
if movie 200000frames, 25fps, ac3 448kbps - i calculate ac3 size in KBytes - 448 * 1000 / 8 * 200000 / 25 / 1024 = 437500. GKnot tell me - 437500 Kbytes. :D
if movie 123456frames, 25fps, ac3 448kbps - i calculate ac3 size in KBytes - 448 * 1000 / 8 * 123456 / 25 / 1024 = 270060. why GKnot tell me - 270047 Kbytes?
* edit
in xvid src i found it
// compensate for avi frame overhead
desired -= frames * 24;
new question
frames: 123456 / fps: 23,976 / interleave: 96ms / ac3: 256kbps / 1cd
sizes:
audio: 256 * 1000 / 8 * 123456 / 23,976 = 164772773 bytes
audio-oh: 24 * 123456 / 23,976 * 1000 / 96 = 1287287 bytes
video-oh: 24 * 123456 = 2962944 bytes
video: 734003200 - 164772773 - 1287287 - 2962944 = 564980196 bytes
so it is correct?