Le 28/10/2012 14:59, Nicolas Ecarnot a écrit :
Hi,
At present, it seems I'm beginning to get rather comfortable with the
video codecs and formats issue.
But there's still a point I can't understand about the audio.
I'm starting with a small video (.avi) containing some video stream and
the audio stream is show as below by avconv/ffmpeg :
Stream #0.1: Audio: pcm_u8, 8000 Hz, 1 channels, u8, 64 kb/s
Cinelerra accepts it well, but the audio track is shown completely
"saturated", even when I try to reduce the sound fade level.
In fact, when reducing the fade level, the sound outputs lower, ok.
But the sound is still saturated.
Frequently with Cinelerra, what is you is not what you get, in the
better way : rendering produces a better export than what Cin is showing.
I then tried to export into different sound codecs and settings, but
nothing gets better.
There is no problem for me to prepare my medias and convert the sound
stream of my input files.
So have you any advice of a rock solid codec the will be gently managed
by Cinelerra?
Rafaela's hint is to use pcm_s16le, but when using it, I get a sound
that is playing twice as fast as normal. Setting -ac 2 gives me a mute
video.
Still sorry for all those self-replies, but they may help future
researchers :
- When converting the sound only (-avcodec copy) with ffmpeg, I'm facing
the issue above.
- When doing the exact same action with mencoder (-oac pcm), Cinelerra
doesn't suffers the issue (waveform is nice and not saturated).
I know my question is not pure Cinelerra, but though has to do with
understanding codecs, so if some may explain, it would be nice.
--
Nicolas Ecarnot
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