Hello,
and thanks for your answers so far. The truth is that I create the final
video in two phases: One is to extract good takes from raw footage,
which is in MJPEG (and adjusting brightness etc) and create intermediate
footage, rendering with Cinelerra. Then I feed the intermediate videos
into the final cut. Since there are different technical setting for
different parts of the footage, this is the only sane way.
The 21-minute "footage" I mentioned previously is the intermediate
footage. It's created by rendering to pipe as YUV4MPEG, piping it to
mencoder, which can turn it to whatever I want. But what format will
really work?
Now to your questions:
Martin Ellison wrote:
> Can you chop it up into smaller clips?
>
Of course I can. This is what I eventually did. And with mencoder at
hand with its -ss and -endpos flags, any video can be chopped. But it's
an ugly solution.
Ichthyostega wrote:
Question: what is the format of your original footage? DV?
As mentioned above, the original is Cinelerras YUV4MPEG. Or pick your
choice.
Question: have you tried using the original footage (without
transcoding) in a quicktime container?
Maybe after transcoding the audio to PCM? for example
something like
Since some of you seem to have good experience with DV, I went for it,
and created a DV file using the following command:
mencoder - -audiofile audio.wav -oac pcm -ovc libdv -of lavf -vf
scale=720:480,harddup -lavfopts
format=mov:i_certify_that_my_video_stream_does_not_use_b_frames -o
"transcoded.mov"
Two remarks:
(1) Since this is actually YUV4MPEG rendering, the audio is taken from
audio.wav. This is the way I work ed previously (and all the time), but
spared this detail in my previous post.
(2) DV is not a generic solution, since the mencoder codec (and possibly
any codec) requires the output to be 720x480 or 720x576.
The bottom line is that I got a 4.5GB file (21 minutes, remember?) which
was playable with (Windows) Quicktime. With Cinelerra something went
wrong, causing the audio channels to appear really weird (maybe because
the audio channels were detected as big endian?).
So I ended up with a file which is very hard to handle, and which
Cinelerra itself doesn't import well. This is sort-of back to square one.
---------------------------------
Now you may ask why I'm bugging you all, if I have a workaround. The
answer is, that since mencoder almost always manages to read any crazy
video you give it, and transcode it consistently and cleanly to anything
else, I'm looking for one, single, high-quality format to feed Cinelerra
with, and make all video oddities, A/V sync in particular, a thing of
the past.
As long as the video is short, both MPEG-2 and MJPEG do well. But when
the video gets longer?
Eli
--
Web: http://www.billauer.co.il
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