maman
26th May 2011, 23:28
I've been trying to investigate some weird thumbnail creation issues in multiAVCHD, and I think i've traced it back to this...
I ripped/demuxed a home dvd (i.e. no encryption or other protection) using pgcDemux. The file is about 1hr 20 min long. The resulting file ripped and plays back fine. But I noticed that the run time that shows up when I click on the file is about 50 min.
I also transcoded this file with multiAVCHD and the resulting output video shows correctly as 1hr 20 min. Through some experimentation, i've found that when I play the files side by side, the running timers and video are in sync. BUT, if I were to open the pgcDemux output file and /skip/ to a certain point in the movie, time timestamp for that part is completely different than what it would have been if I had just let the video play naturally to that part...
So, a frame that normally comes up around 10 min if I let the file play naturally, will also come up if I open the file and move the playhead to 6:30.
Since you seek through the file to chose chapters and set thumbnails in multiAVCHD, this produces some completely unexpected results between what you see when you set the thumbs, and what thumbs you actually get when you publish, since the timecodes point to a totally different place.
It seems like the issue is the way pgcDemux is demuxing my dvd... does anyone know what my issue might be here? Originally I thought it might be a framerate issue, but it seems like the framerate is being read correctly (especially since multiAVCHD is picking up/transcoding with the same framerate and the resulting file shows as being the correct length)
I ripped/demuxed a home dvd (i.e. no encryption or other protection) using pgcDemux. The file is about 1hr 20 min long. The resulting file ripped and plays back fine. But I noticed that the run time that shows up when I click on the file is about 50 min.
I also transcoded this file with multiAVCHD and the resulting output video shows correctly as 1hr 20 min. Through some experimentation, i've found that when I play the files side by side, the running timers and video are in sync. BUT, if I were to open the pgcDemux output file and /skip/ to a certain point in the movie, time timestamp for that part is completely different than what it would have been if I had just let the video play naturally to that part...
So, a frame that normally comes up around 10 min if I let the file play naturally, will also come up if I open the file and move the playhead to 6:30.
Since you seek through the file to chose chapters and set thumbnails in multiAVCHD, this produces some completely unexpected results between what you see when you set the thumbs, and what thumbs you actually get when you publish, since the timecodes point to a totally different place.
It seems like the issue is the way pgcDemux is demuxing my dvd... does anyone know what my issue might be here? Originally I thought it might be a framerate issue, but it seems like the framerate is being read correctly (especially since multiAVCHD is picking up/transcoding with the same framerate and the resulting file shows as being the correct length)