Ben Kenobi
11th February 2003, 23:36
Greetings to all members.
I'm new here, i'm sorta of a newbie in this world, but i wanna tell my experience with AC3 Muxing hopin it will help people out.
I read, and also experienced personally, that ac3-avi muxing is a real pain in the ass.
At real first, i was usin Nandub, but when i muxed my second movie (ST8: First Contact) with double ac3 stream 4ch at 320k, i found out that some scenes (the infamous pan&scan with slow movement of objects and/or camera) looks jerky. At first i wrongly thought it was simply a "too-high-CPU-load" problem, but after some searchin, i read of Nandub buggy behaviour when muxin sc3 audio. So, i decided to try Avimux GUI 1.11. After muxin again First Contact with followin option (avoid seeks, rec-list, opendml, 160/160) i found out somethin vey annoyin (at least 4 me): audio stream switch on the fly was no more possible; when i tried, all i got was REALLY REALLY jerky playback (absolutely awful) (actually i'm not sure if it is a bug, maybe it is a consequence of using reclist). Fortunately i've found a simple workaround 4 this: just stop playback (not pausin) with ESC key, then select language, then play it again. So, i've thought to myself i've to live with this weird behaviour (at least Avimux was able to correctly mux it), but then i found out another flaw: durin some testin i've done with Fotr chapter 17 (death of Boromir) muxin it with Avimux (again with double ac3 stram at 448k), i realized that output AVI would playback ALMOST perfectly, except for random jerky shot (after massive testin with any value for pre&inter possible, i think those jerky shots happens in relation to which settings you chose durin muxing: 4 example with 128/128 i got this jerkiness in some spot, while with 160/160 i got it in another spot, quite different from the previous). At this point i became pretty desperate, not knowin what to do.
Then i decided to give VdubMod a try, and found out somethin quite interestin. Using VdubMod 1.4.13.1 (31.01.03 build downloaded at sourceforge.net) and enablin AC3 frame handlin, i mux successfully both of my testin clips with particular value related to ac3 source stream.
I post here the simple math formula i used for muxin those two files, hopin that people here could test it out:
Interleave = "numbers of channel of ac3 stream" * 32
Preload = "Interleave" * 5
(I count LFE as a channel)
PLs, post any feedback you have on this topic. Thx!
I'm new here, i'm sorta of a newbie in this world, but i wanna tell my experience with AC3 Muxing hopin it will help people out.
I read, and also experienced personally, that ac3-avi muxing is a real pain in the ass.
At real first, i was usin Nandub, but when i muxed my second movie (ST8: First Contact) with double ac3 stream 4ch at 320k, i found out that some scenes (the infamous pan&scan with slow movement of objects and/or camera) looks jerky. At first i wrongly thought it was simply a "too-high-CPU-load" problem, but after some searchin, i read of Nandub buggy behaviour when muxin sc3 audio. So, i decided to try Avimux GUI 1.11. After muxin again First Contact with followin option (avoid seeks, rec-list, opendml, 160/160) i found out somethin vey annoyin (at least 4 me): audio stream switch on the fly was no more possible; when i tried, all i got was REALLY REALLY jerky playback (absolutely awful) (actually i'm not sure if it is a bug, maybe it is a consequence of using reclist). Fortunately i've found a simple workaround 4 this: just stop playback (not pausin) with ESC key, then select language, then play it again. So, i've thought to myself i've to live with this weird behaviour (at least Avimux was able to correctly mux it), but then i found out another flaw: durin some testin i've done with Fotr chapter 17 (death of Boromir) muxin it with Avimux (again with double ac3 stram at 448k), i realized that output AVI would playback ALMOST perfectly, except for random jerky shot (after massive testin with any value for pre&inter possible, i think those jerky shots happens in relation to which settings you chose durin muxing: 4 example with 128/128 i got this jerkiness in some spot, while with 160/160 i got it in another spot, quite different from the previous). At this point i became pretty desperate, not knowin what to do.
Then i decided to give VdubMod a try, and found out somethin quite interestin. Using VdubMod 1.4.13.1 (31.01.03 build downloaded at sourceforge.net) and enablin AC3 frame handlin, i mux successfully both of my testin clips with particular value related to ac3 source stream.
I post here the simple math formula i used for muxin those two files, hopin that people here could test it out:
Interleave = "numbers of channel of ac3 stream" * 32
Preload = "Interleave" * 5
(I count LFE as a channel)
PLs, post any feedback you have on this topic. Thx!