On Wed, Sep 13, 2006 at 11:23:28AM +0200, Richard Rasker wrote: > Hi, > > I'm trying to get better control over the quality of an MPEG result, > found this one (among many similar solutions) in the mailing list > archives: > > "Export as an YUV4MPEG stream and use a pipe to encode the YUV stream : > yuvcorrect -v 0 -T INTERLACED_BOTTOM_FIRST | mpeg2enc -v 0 -r 32 -4 1 > -2 1 -D 10 -g 15 -G 15 -q 5 -b 9400 -f 8 -o $1 > > Export an AC3 sound stream at 224 kbps > > Mplex everything with : > mplex -f 8 -V audio.ac3 video.m2v -o movie.mpeg" > > And there are many more references to piping - quite justified, as it > prevents *huge* temporary files from being created (the YUV4MPEG stream > is about 1GB per minute of video). Otrherwise, one would need at least > 60GB of free HD space at all times for every hour of video rendering. > > > Alas, there's one thing I somehow don't understand: how exactly do I > pipe the output from Cinelerra to the yuvcorrect line? > > I thought I understood pipes (they're equally simple as useful), but I > can't seem to make it work here. I tried the following procedure: > > [CLI]: mkfifo cinepipe > [Cinelerra]: Render to YUV4MPEG Stream - file name: cinepipe > [CLI]: yuvcorrect ... -o video.m2v < cinepipe > > However, Cinelerra says it's busy rendering, but it just sits there and > does nothing; nor does top show any activity in the yuvcorrect/mpeg2enc > department. > I suspect that Cinelerra somehow has trouble with named pipes - if I > replace the last CLI command with cat cinepipe > /dev/null, there's > still no progress in Cinelerra. > > I'm pretty certain that the solution is *really* simple - but I'm afraid > that I'm even simpler - too simple in fact to see it. Google turned up > lots of tips about plumbing, and the usual explanations and examples > about the | symbol, but nothing much useful on using pipes to process > (stream) output from GUI applications. > > > Thanks in advance for any explanation, > > Regards, > > Richard Rasker
Hello Richard, I described the steps in the Wiki page : http://ftconsult.taxnetusa.com/twiki/bin/view/Cinelerra/Rendering#RENDERING_OPTIONS_encoding_tips (at the bottom of the page) Nicolas, Paris. _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
