jb wrote: > On Wednesday 21 March 2007 00.06:54 Stephane Fillod wrote: >> Tue, Mar 20, 2007 at 11:03:05AM -0300, Fabricio Rocha skribis: >>> My project has a lot of clips from a single .VOB file, NTSC DVD with AC3 >>> 48k audio, and lots of crossfade transitions among the clips. The >>> transitions work OK in the timeline itself, but when I export the >>> timeline to a video file, I notice that, while the video is correctly >>> cut and crossfaded in the clip end, the audio from clip "A" is extended >>> beyond the point where it should end, and only then the audio track of >>> clip "B" starts. >>> >>> This causes a cumulative effect. In a certain point of the final video, >>> the audio track was completely out of sync with the video, something >>> like a 5 seconds delay. I tried to export to many formats, but the >>> problem remained. >>> >>> Is this a known bug? Does it happen to any of you? Or am I doing >>> something wrong? > > Ok, I did some tests and it seems to me that the problem occurs if you export > to a format which has a different audio frequency. Can you confirm this ? > > Copy the export settings from a profile that shows the bug and create a new > custom encoder with the same settings, but change the "frequency=" parameter > to match the frequency of your source video: "frequency=48000". > > Let me know if export works fine that way...
I have a series of jpegs with two audio tracks on a 15 minute timeline with a few fade ins & outs using "volume" effect. I'm exporting to NTSC DVD. I converted all the audio files to 48000 Hz wavs using sr-convert (.sf.net). I get a pretty significant shift in time--like a few seconds after a few minutes of audio. I did a custom export to .vob using this (using stock DVD NTSC export and adding "frequency=48000"): format=dvd vcodec=mpeg2video acodec=ac3 size=720x480 video_bit_rate=6000000 video_rc_max_rate=9000000 video_rc_min_rate=0 video_rc_buffer_size=1835008 mux_packet_size=2048 mux_rate=10080000 audio_bit_rate=192000 audio_sample_rate=48000 frame_size=720x480 frame_rate=30000/1001 gop_size=18 me_range=63 frequency=48000 It did not appear to have any effect--in other words, there is still a significant time lag. The images get ahead of the audio. When playing in the timeline things are fine. Thanks for kdenlive, I'm really enjoying it. :) -Jeff
