Il 19/03/2013 02:25, Len Ovens ha scritto:
I have another issue with the tutorial above.
>It says:
>"Now you have two separate files, an .mkv and a .wav file and because
>jack_capture was started right after ffmpeg audio should be no more out
>of sync then just a few millisecs."
>
>Actually my files are out of sync because they have different durations.
>Video is 5:31 and audio is 9:21.
My first guess is a frame rate issue... like a half frame rate that is
also mistranslated from 25hz to 29.*dropframe (or vise versa). It really
doesn't matter at this point, check two things. Listen to the wave, does
it sound right"? Watch the video stream, does it look really fast? Do they
play back at the listed times?
Are you using spdif for audio in? If so, where is it getting sync from?
These are all shots in the dark. The first thing is to play them back and
see if there is an issue with audio or video or both.
Your guess is probably right.
The audio is ok, while the video is a bit too fast.
Yes, they play back at the listed times.
Here's what ffmpeg say:
Input #0, matroska,webm, from 'screencast_video_20130318-23h53.mkv':
Metadata:
ENCODER : Lavf54.29.104
Duration: 00:05:31.00, start: 0.000000, bitrate: 426 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p,
1280x800, SAR 1:1 DAR 8:5, 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
Input #0, wav, from 'screencast_audio_20130318-23h53.wav':
Duration: 00:09:21.79, bitrate: 2304 kb/s
Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz,
stereo, s32, 2304 kb/s
But I don't understand... I've recorded at 30 fps and I'm watching at 30
fps. Why it's playing faster than the recording?
--
Federico
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