Wow! I'm sure learning a lot today. Thanks guys! ffmpeg reports the following from one of the .avi files from my digital camera:
Duration: 00:01:26.1, start: 0.000000, bitrate: 15622 kb/s Stream #0.0: Video: mjpeg, yuvj422p, 640x480, 30.00 fps(r) Stream #0.1: Audio: pcm_s16le, 44100 Hz, mono, 705 kb/s I tried AVIDEMUX and it works perfectly (once I learned how to do it) to cut up an .avi file directly. Then I can use ffmpeg to shrink the resulting file and turn it into an mpg for ease of e-mailing. Sure, the quality is much worse but I'm not too particular about that at the moment since I just want certain portions of the .avi file and then the smallest file size possible. If I was putting it on a DVD, I would have to do things differently and implement many of your suggestions. Not there yet though. :-) Thanks again for all the valuable information! I guess you'll make a Linux video GEEK out of me yet! Footer On 7/30/07, Ralph Glasstetter <[EMAIL PROTECTED]> wrote: > Of course, Michael's right.... > converting back and forth will in any case degrate quality more than > necessary... but if there's no cut tool for MJPEG that's the only > possibility! > > Assuming that the camera format has a very moderate compression > and you use also a very large bitrate for the MPEG2 (probably more than > the DVD target implies... try -b 10000k on the RIGHT side of the target switch > to overrule the default), I wouldn't expect that you see the difference IF > the resulting Video has to be a rather small DIVX-AVI in the end (with > [EMAIL PROTECTED]). If not... I would use a suitable MPEG2 bitrate and > stay with the cutted MPEG2 video (in 720x576 resolution and burned as a DVD?), > i.e. omitting the last conversion! > > I'm pretty sure ffmpeg can deal with that MJPEG... if you try: > "ffmpeg -formats" you can find it in the list of codecs... ;-) > But "lav2mpeg" will also work... and is maybe even better since it's more > specialized for this kind of conversion... I don't know! > > BTW, just calling "ffmpeg -i video.avi" will give you information about the > video (Duration, Bitrate, A/V codec)... the last 3-4 lines of output...:) > > ciao > Ralph > > PS: The material from a DV camera is usually interlaced... > so you either have to use "-deinterlace" to get a progressive video > or "-ildct -ilme" to tell the mpeg2-codec of ffmpeg to support interlaced > motion estimation resp. cosine transformation. > > The coice depends on the device where you want to watch the resulting > video... PC or TV! > > Also DVBcut can not deal with videos, where the interlaced stream is stored > seperately with 50Hz half-frames, instead of 25Hz full frames (containing the > two half ones). Michael mentioned that already... you can see this also at > the ffmpeg output lines... ;-) > > Am Montag, 30. Juli 2007 19:53 schrieb Footer: > > Ralph & Michael, > > > > Thanks for the thoughts/tips/ideas for what I'm trying t accomplish! > > I really appreciate it! And thanks for the GREAT program! In the > > past, I've used dvbcut for cutting MPEG from the stream out of my > > video capture card (a PVR-250) and it's worked flawlessly. > > > > The stream I'm trying to convert/cut now is from a new digital camera > > we just got (Canon Powershot ES850 IS). How can I tell what type of > > codec it is? When I float the cursor over the file name (the .avi > > file), it gives me a type: Microsoft AVI Video (ARGH!) and Video > > Codec says: mjpg, Audio Codec: Microsoft PCM. I'm a relative newbie > > when it comes to this video editing stuff in Linux but so far, I've > > been able to get by! And yes, I have messed with AVIDEMUX but not > > recently. > > > > That is quite the complicated ffmpeg line but I shall give it a try > > and see what kind of results it gives me. Learned a lot more about > > ffmpeg from your message as well! > > > > Thanks! > > > > On 7/30/07, Ralph Glasstetter <[EMAIL PROTECTED]> wrote: > > > Hi, > > > > > > Am Montag, 30. Juli 2007 16:54 schrieb Footer: > > > > Hey, hey, I never thought about that! Convert it to mpg with ffmpeg > > > > on the command line and then use DVBCut? > > > > > > The only way, if you insist in using DVBcut for cutting an AVI... ;-) > > > > > > BTW, what codec was used for that AVI-video? DIVX? > > > Ever tried AVIDEMUX(2) for cutting it? > > > > > > > I just tried that and DVBCut > > > > didn't like it too much. > > > > > > You used probabely the wrong switches...? > > > > > > > But I was able to shrink the file from 168MB > > > > to 6MB which is acceptable to me. > > > > > > That's nearly impossible with adequate quality! > > > > > > > Would be nice to further cut it as > > > > an mpg but I don't know how much more time I'm willing to invest to do > > > > that. For what it's worth, here's the line I used to shrink the file > > > > (it was 640x480 and this command cut it down to 320x240): > > > > > > > > ffmpeg -i input_file_640x480.avi -ar 22050 -b 500 -s 320x240 > > > > output_file_320x240.mpg > > > > > > OK, with a bitrate of only 500 bits/sec it's no wonder that you ended up > > > with just 6 MB. Could you really see a proper video...? :) > > > You have to specifiy "-b 500k" if you want KILObits/sec!!! > > > > > > But with MPEG2 this also would give a rather bad quality... are you > > > really sure that it's a MPEG2 video in an AVI container? I never saw > > > that... and with your command line you didn't changed the codec.... > > > > > > > Would welcome any other ideas!!! > > > > > > For cutting with DVBcut I would convert the video to a rather large > > > bitrate MPEG2 stream to preserve the quality as much as possible (without > > > changing the resolution!)... maybe with "-target DVD -s 640x480"... and > > > additionally a "-acodec copy", if the audio is already coded in MP2/AC3 > > > 48kHz. > > > But if not, you have to specify "-acodec mp2 -ab196k -ar 48000", > > > otherwise DVBcut probabely does not recognize the Audio channel. > > > > > > After cutting you can shrink it down again to a AVI/DIVX with > > > [EMAIL PROTECTED] and [EMAIL PROTECTED]/22kHz or whatever... > > > > > > I usually use: > > > ffmpeg -i INFILE -f avi -vcodec mpeg4 -b 800k -g 250 -bf 2 -s 640x480 > > > -aspect 4:3 -acodec mp3 -ab 128k -ar 44100 OUTFILE > > > > > > ciao, > > > Ralph > > > > > > > On 7/30/07, Michael Riepe <[EMAIL PROTECTED]> wrote: > > > > > Hi! > > > > > > > > > > Footer wrote: > > > > > > Well ... both? > > > > > > > > > > I doubt that will ever happen. Output, maybe. > > > > > > > > > > > Although I wouldn't mind taking AVI input and making > > > > > > it MPEG output ... When I try open an AVI file for editing, it > > > > > > says: "Unknown file type" > > > > > > > > > > DVB material uses MPEG-2 container formats (PS/TS) exclusively. There > > > > > was (and still is) no need to support other input formats, unless you > > > > > want to turn dvbcut into a general-purpose video cutting software. > > > > > > > > > > That, on the other hand, will require massive changes to the code. > > > > > I'm afraid you'll have to live with AVI<->MPEG converters. > > > > > > > > > > Michael. > > > > > > > > > > --------------------------------------------------------------------- > > > > >---- This SF.net email is sponsored by: Splunk Inc. > > > > > Still grepping through log files to find problems? Stop. > > > > > Now Search log events and configuration files using AJAX and a > > > > > browser. Download your FREE copy of Splunk now >> > > > > > http://get.splunk.com/ > > > > > _______________________________________________ > > > > > DVBCUT-user mailing list > > > > > DVBCUT-user@lists.sourceforge.net > > > > > https://lists.sourceforge.net/lists/listinfo/dvbcut-user > > > > > > > > ----------------------------------------------------------------------- > > > >-- This SF.net email is sponsored by: Splunk Inc. > > > > Still grepping through log files to find problems? Stop. > > > > Now Search log events and configuration files using AJAX and a browser. > > > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > > > _______________________________________________ > > > > DVBCUT-user mailing list > > > > DVBCUT-user@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/dvbcut-user > > > > > > ------------------------------------------------------------------------- > > > This SF.net email is sponsored by: Splunk Inc. > > > Still grepping through log files to find problems? Stop. > > > Now Search log events and configuration files using AJAX and a browser. > > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > > _______________________________________________ > > > DVBCUT-user mailing list > > > DVBCUT-user@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/dvbcut-user > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by: Splunk Inc. > > Still grepping through log files to find problems? Stop. > > Now Search log events and configuration files using AJAX and a browser. > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > _______________________________________________ > > DVBCUT-user mailing list > > DVBCUT-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/dvbcut-user > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > DVBCUT-user mailing list > DVBCUT-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/dvbcut-user > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. 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