Florin Andrei wrote: > Dave Phillips wrote: > >> Thanks again, Florin. Have you considered writing a HOWTO or a dedicated >> Web site for this information ? It's obvious you know it very well, and >> it would be great to have a 1-stop web site for it. >> > > This is standard knowledge in the field of video processing. Anyone who > has spent some time with cameras and NLEs and stuff like that will tell > you the same things. > I'm learning as I go. I've been following and studying the links you've posted, I'm getting a better idea of the work involved and its terminology (a non-trivial matter to one without that standard knowledge). re: Vimeo >> ... the Vimeo site converts my videos, but I don't know to what format. >> Given what you've seen and understand of the site, what would be my >> best-choice options for rendering the AVSynthesis images to video ? >> > > There's no simple answer. > You have to come up with a procedure to generate the video file that > will be uploaded. They have a few recommendations... > > http://www.vimeo.com/help/compression > > ...which essentially boil down to "H.264 with AAC at 30 or 25 fps", but > then turn around and say they convert everything to 24. I guess some > experiments are required. > I've been experimenting, but I think I have some other issues to resolve first. > Eugenia Loli-Queru has several HOWTOs regarding the different formats > recommended for Vimeo... > > http://www.vimeo.com/forums/topic:3671 > > ...but those are geared towards people using typical NLEs and stuff like > that. Even so, it's a bit of a hit-and-miss - her Vegas HOWTO didn't > work for me very well with material from an AVCHD camera, it created > choppy video. I didn't try yet other methods. > I followed her advice for using mencoder. The results were okay, but I noticed that the video pixellated rather obviously during fades, it seemed similar to the quantization effect when a low-grade reverb fades out. > There's a bunch of interconnected decisions that need to be made, going > back to the AVS parameters, and that's why I'm saying I'd like to try > this software myself before blurting out random advice that may not be > so helpful after all. > Understood, though your advice has been and is most welcome here. I'm in terra incognita where video is concerned, but suddenly I'm there and I'm still getting my bearings. > >> Just to clarify: AVS does no rendering to video at all, it simply >> creates the image sequence. I have control over the recorder frame rate >> and the image width & height, that's all that's available to me in AVS >> itself. >> > > Yup, that should be enough. The collection of images just needs to be > fed into the processing chain, and then all kinds of things can happen: > cropping, resizing, interlacing, changing the frame rate, etc. Once > you're in the uncompressed domain, almost anything is doable. > I should add that I also have control over the audio sampling rate. I've configured AVS's output for 25 fps at 640x480, I'll try 720x480 today. I've looked a bit further into the letterbox problem. The images themselves are TARGA-format images that include the black bands. I've looked at the code for the image creation but there's no indication that the process takes any options to eliminate the letterboxing. I could be wrong about that, I'm not a Java programmer. :( Meanwhile I'll see what I can do to crop the TGA images. I'll report back after more experimentation. Best, dp _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
