Hi On Monday 25 July 2005 10:53, Sven Over wrote:
Hello.
I encountered a very subtle problem when generating DVD files with ffmpeg. In a nutshell: the files I create work with many many DVD players (stand-alone and software players) just fine, but it stumbles and stutters on one hardware player. Since this is not a cheapo player (it is a Pioneer DV-656A, indeed), and the owner never experienced such problems with any DVD, I conclude there must be something wrong with the DVD I made. As I will explain later, it is not a problem of authoring and it is very unlikely to be a problem with muxing (which is also done by ffmpeg).
did you try ffmpeg encoding + mplex and mpeg2enc with ffmpeg muxing? it would be interresting as we would then know if its encoding or muxing where the problem is where do the problems occur some high motion or boring not changing scene? [...]
I think the "-sgop" option doesn't work, at least not the way I understand it. Even when supplying that option, the GOP sizes vary. Maybe the problem is even in that area... I have the feeling that the stumbling can be triggered by a very short GOP. E.g. there is one GOP of only 3 frames (I-B-B), and I think this is the place at which the video stumbles first. When using mpeg2enc, I encountered a warning that a scene change was detected, but a new GOP cannot be started because the current one would end up being too short. That might be a hint. But: I have other videos (my menues on the DVD) which have short GOPs only after a minute or so, and they stumble right within the first few seconds. So after all... it doesn't make any sense for me anymore....
try -sc_threshold 1000000000 and try -cgop maybe try to change -mux_delay also try reencoding audio with -async 100 instead of -acodec copy ahh and tell us if any of that helped [...] -- Michael