Re: [Mjpeg-users] Good intermediate format to use
On Sunday 18 January 2009, Bernhard Praschinger wrote: Hallo Peter Chant wrote: Any suggestions of a video file format to use whilst undergoing the editing process after having passed video through mjpegtools? I know a raw format is ideal, but I'm not looking at broadcast quality source material so something that does compresses a little with a small to moderate amount of compression would be good. I'm wanting to keep video and sound together. If you only work with mjpeg files and do simple cut/edit action. You can use the editlist files. Yes, I have used glav to cut the wanted sections out of the orignal captured video. mjpeg stuff |mpeg2enc -f 8 -4 2 -2 1 -F 3 -q 8 -o video/$1.m1v I've then either passed this to devedee or edited in kdenlive and passed to devedee, after multiplexing the soundtrack back onto the file. From what I have seen from the kdenlive website. The format where you have not that much compression seems to be mov as container with DV compression. The mjpegtools can read that format. And use that file when you are done with editing for encoding with the mjpegtools. Can it write it? I'm wondering what is best used to feed video from mjpegtools to kdenlive? Basically I have put mjpeg tools at the beginning of the process rather than at the end to tidy things. Basically glav seems to be great for creating simple quick and dirty edit lists! Now, I thought this would be the right format for DVD but devede re-encodes. When editing with kdenlive it always re-encode the stream anyway (obvious if you think about it). So perhaps an exactly DVD compatible format is unecessary. What format do people suggest? I have a very simple toolchain. I record with a Zoran based card (lavrec only), or with a ADVC-100 and kino. The third source are transport streams using ProjectX. Than I do just simple cutting with glav/lavplay, and encode the files afterwards with the mjpegtools. It's the authoring to DVD stage. I think I've found the option, there is a tickbox buried away in the devede menus to tell the program that the input file is already in a dvd friendly format. Bit of a nuisance that I can't do it globally as I have about twenty files on the DVD! My overall concern was that I was generating unnecessary decoding and encoding processes in my workflow. Given the source material I suspect its not noticable anyway, but it would be nice to not add too much loss in the editing process. Actually the test disk looked OK on screen. You can raise the quality factor a little to 3 or maybe even 2. mpeg is a compression where you loose information, and have artefacts. Yes, I managed a little improvement. To some extent it may just be that I don't look at other people's credits at close range on a PC monitor, especially frame by frame, so perhaps I'm expecting a bit too much from the process! Credits on the test disk were a bit rough, need to burn a new disk and have another look. Thanks, Pete -- Peter Chant http://www.petezilla.co.uk -- This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword ___ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Problems running lavrec
On Saturday 22 December 2007, Bernhard Praschinger wrote: From my guess you use a bttv based card ? If you use a bttv based card, you need to use a command like that: lavrec -f a -i p -g 352x288 -q 80 -R l --software-encoding test.avi lavrec -f a -g 720x576 -s -q 80 -U -r 44100 -R l --software-encoding raw.avi Works, but with stuttering audio. Audio is fine if I either drop the resolution, go mono or reduce the sampling rate to 22000. streamer can also create mjpeg encoded AVI's. Yes, but I am having trouble with that - it seems to use more cpu than lavrec and just give up at some point. Think I also had audio sync problems - just having another go to confirm. streamer -t 180:00 -r 25 -s 720x576 -o raw.avi -f mjpeg -F stereo CPU usage it a little high at around 85% - on a 2.5GHz athalon. Either solution would work well for me if I can caputure to something that uses a bit less disk space than raw. I can capute raw fine - its just that the file sizes are a bit too large for comfort. I'm wondering if I got something like this: http://www.scan.co.uk/Products/ProductInfo.asp?WebProductID=318489 whether I could use the built in hardware encoder. My existing card is saa7134 based. Not sure if hardware encoding can be done with that card. Pete - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users -- Peter Chant http://www.petezilla.co.uk - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
[Mjpeg-users] Problems running lavrec
Dear All, I'm having trouble running lavrec, copy of the script I am using is below: #!/bin/sh v4lctl setinput Composite2 v4lctl contrast 50 v4lctl bright 100 # export LAV_VIDEO_DEV=/dev/v4l/video0 export LAV_AUDIO_DEV=/dev/sound/dsp export LAV_MIXER_DEV=/dev/sound/mixer #lavrec -f a -g 720x576 --stereo -R m raw.avi lavrec --format=a --input=p --quality=80 --decimation=2 raw.avi Unfortunately it does not work - the output I get is: ++ WARN: [lavrec] Unable to set negative priority for audio thread. ++ WARN: [lavrec] Pthread Real-time scheduling for audio thread could not be enabled. **ERROR: [lavrec] Error getting video parameters: Invalid argument **ERROR: [lavrec] Something went wrong while setting up the card Any ideas? Just to note for reference, streamer from xawtv seems to work, so I would not think it was a v4l issue. Albeit I'm having issues that it uses far too much disk space when saving to raw video and I'm having issues when it saves to a compressed format with it maxing the CPU and eventually failing. Suggestions appreciated. Pete -- Peter Chant http://www.petezilla.co.uk - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Problems running lavrec
On Saturday 22 December 2007, Bernhard Praschinger wrote: From my guess you use a bttv based card ? If you use a bttv based card, you need to use a command like that: lavrec -f a -i p -g 352x288 -q 80 -R l --software-encoding test.avi Worked a treat. Tried it with 720x576 as well - worked fine except audio lost sync. Will try running it as root - as it complained about not being able to set a negative nice level. The important things for a bttv card are the -g and --software-encoding options. You might encounter problems with the audio, for testing purposes you can disable it with -a 0. The -i option works different on a bttv based card. -i p means the 1st Bt8x8 input. Take a look at the lavrec for more info. streamer can also create mjpeg encoded AVI's. Yes, it had problems keeping up though. I used v4lctl to set the input, I had trouble with the -i options. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users -- Peter Chant http://www.petezilla.co.uk - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
