October 2005 - ffmpeg-user - lists.ffmpeg.org

questions about performance tuning and enable-shared
by reid.vail＠mci.com 13 Sep '06

13 Sep '06

Shown below is the ffmpeg version I'm running. I have two questions about different issues: 1) performance tuning and 2) using --enable-shared. --------------------------------------------------------------------------- reid at linux:~/FFMpeg-20050519/FFMpeg-20050519> ffmpeg -version ffmpeg version 0.4.9-pre1, build 4755, Copyright (c) 2000-2004 Fabrice Bellard configuration: --prefix=/usr --enable-mp3lame --enable-gpl built on May 18 2005 22:26:04, gcc: 3.3.4 (pre 3.3.5 20040809) ffmpeg 0.4.9-pre1 libavcodec 4755 libavformat 4624 ---------------------------------------------------------------------------- 1) Regarding performance tuning, I wonder if I well get better performance from ffmpeg if I ./configure it with the cpu info I'm using? I have an AMD x86_64. Should I use the --tune option, and would the syntax be --tune=x86_64, or some other syntax. What might that be, please? 2) When I have run ./configure with --enable-shared the Make bombs. Should I be adding some other options or switches (meaning..is it something I'm doing wrong?) and can you tell me what it is I need to do or is ffmpeg just not ready for --enable-shared with x86_64? Thanks Reid ______________________________________________________________________ This e-mail has been scanned by MCI Managed Email Content Service, using Skeptic? technology powered by MessageLabs. For more information on MCI's Managed Email Content Service, visit http://www.mci.com. ______________________________________________________________________

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3gp vs 3g2 to flv
by ducky＠flukiest.com 17 May '06

17 May '06

All: I am able to convert 3gp files to flv format just fine. However I get a error when I try to convert a 3g2 to flv. Is there something I need to enable to accomplish this? thanks. ffmpeg -i Video_082305_001.3g2 -hq -acodec mp3 -ar 44100 -ab 64 -f flv -s 320x240 -aspect 4:3 -y Video_082305_001.flv ffmpeg version CVS, build 3211266, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-gpl --enable-faad --enable-faac --enable-amr_nb built on Aug 21 2005 23:55:01, gcc: 3.3.3 20040412 (Red Hat Linux 3.3.3-7) Input #0, mov,mp4,m4a,3gp,3g2, from 'Video_082305_001.3g2': Duration: 00:00:29.3, start: 0.000000, bitrate: 113 kb/s Stream #0.0: Audio: aac, 64000 Hz, 9 channels Stream #0.1: Video: mpeg4, yuv420p, 320x240, 15.00 fps Resampling with input channels greater than 2 unsupported.Can't resample. Aborting. Abort at ffmpeg.c:1723

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Re: [MPlayer-users] unknown codec 0x66666974
by mortarn_lists＠yahoo.com.au 22 Feb '06

22 Feb '06

* Guillaume POIRIER <poirierg at gmail.com> [2005-10-31 14:08 +0100]: > On 10/31/05, Joshua Crawford <mortarn_lists at yahoo.com.au> wrote: >> * Guillaume POIRIER <poirierg at gmail.com> [2005-10-30 10:02 +0100]: >>> On 10/30/05, Joshua Crawford <mortarn_lists at yahoo.com.au> wrote: >>>> I just recently subscribed to the podcast from Make magazine >>>> <http://makezine.com/blog/archive/make_podcast/index.xml>, and it contains a >>>> number of .m4b files. I was lucky, in that the first one I tried playing >>>> (MAKE_2005-07-18.m4b) had JPEG images in it, and it worked fine. The rest >>>> all have TIFF images, and it seems mplayer doesn't support TIFF (it's not >>>> linked against libtiff, and there's no configure option I can see). >>>> >>>> So, is there some outside codec I need installed? I have the Quicktime >>>> codecs, from the all codecs tarball from April. >>> >>> I don't think it's gonna make any difference, but please try CVS >>> version of MPlayer. >> >> I've just installed the CVS version, and you're right - there's no >> difference. > > The best thing is to upload a "Tiff" video sample online somewhere and > give a link to it on ffmpeg mailing list so that ppl can hopefully > work on it and make it watchable. Ok, so this mail is now also going to ffmpeg-user, and hopefully followups will only be there. I don't need to upload the files, I just have to say where I got them :) <http://downloads.oreilly.com/make/MAKE_2005-07-18.m4b> has JPEG images, and works in mplayer. <http://downloads.oreilly.com/make/MAKE_2005-08-01.m4b> (and all the others from the RSS feed I linked above) has TIFF images, and the pictures aren't displayed (audio works). -- Joshua 'bruce' Crawford ... http://www.geocities.com/mortarn Quando omni flunkus moritati

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Error: Could not find video grab device - need help
by kamarudin＠gmail.com 18 Jan '06

18 Jan '06

Hi all, 1st of all, im Linux noob. Im running Fedora Core 3. I try to put my camera onthe web by using ffserver and ffmpeg. I can see the aoutput using xawtv, so my camera was OK. As root, i run ffserver....and ffserver started. But when i run.... ... [root at xxx]# ffmpeg -vd '/dev/video0' -an http://localhost:8090/feed1.ffm ffmpeg version 0.4.9-pre1, build 4730, Copyright (c) 2000-2004 Fabrice Bellard configuration: --build=i686-redhat-linux-gnu --host=i686-redhat-linux-gnu --target=i386-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --extra-cflags=-O2 -g -pipe -m32 -march=i386 -mtune=pentium4 --enable-mp3lame --enable-vorbis --enable-faad --enable-faac --enable-xvid --enable-pp --enable-shared-pp --enable-shared --enable-gpl --disable-strip built on Nov 16 2004 11:18:55, gcc: 3.4.2 20041017 (Red Hat 3.4.2-6.fc3) [video4linux @ 0xb85428]Fatal: grab device does not support suitable format Could not find video grab device What going wrong?? Help me please :(. Thanx in advance. -- regards, kamarudin samsudin

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Encoding live TV
by danycrit＠yahoo.it 09 Jan '06

09 Jan '06

Hi All, It is several weeks that I try to encode a live TV feed (from a V4L2 capture device) to an MPEG2 file using the avformat library without success. I always get 'buffer underrun' errors and core dumps from glibc due to a double free or corruption (caused by avformat/avcodec since the code without the compression calls works perfectly). The resulting file, when playable, is always out of sync, stuttering and all weird things that could happen to a video file. Since it is a live source I can't feed more data than what I receive. I know that the video and audio timings may not be exactly to the microsecond, but why avformat is so concerned about this buffer ? Is there a way to disable this damned buffer ? I searched for some tutorials, example or even for a spell to cast in order to get this thing working, but without success. I found thousands of site with the avformat/avcodec source code nicely formatted but without any useful information. It seems that avformat users are more concerned about playing a file rather than creating one (should I assume that avformat is useful for playing only ?). I just updated the ffmpeg library: bad move, now the frame rate fields are missing, how do I set the frame rate ? Geez, these guys must hate documentation !! The library version should be: 0.4.9-0.lvn.0.18.20050801.4 on a FC4 X86_64. Please can someone help me ? Thanks

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ffserver/ffmpeg trouble?
by danci＠agenda.si 11 Dec '05

11 Dec '05

Hi, I'm trying to use ffmpeg with ffserver and the 'latest' CSV (24.6.05 was the date I built and tested it) doesn't seem to work. There are (or seem to be) no problems grabbing the video using just ffmpeg and saving it into a file - using the same options (codecs, bitrates, ...) as I used in 'ffserver.conf'. That's the command line (I limited the time to 30s): ffmpeg -vd /dev/video0 -t 30s -f asf -vcodec msmpeg4v2 -b 768 -s 4cif -r 15 -acodec mp3 -ab 128 -ac 1 out.asf If I transfer the file to a Windows machine, the WMP and BSPLAYER have no problem playing it. But if I try to serve this file via 'ffserver' or 'ffmpeg' to feed a live stream, I get a lot of errors or warnings: >From ffmpeg (when it starts): [msmpeg4v2 @ 0x404036f0]removing common factors from framerate [msmpeg4v2 @ 0x404036f0]rc buffer underflow [msmpeg4v2 @ 0x404036f0]rc buffer underflow [msmpeg4v2 @ 0x404036f0]rc buffer underflow And from ffserver (when the client connects): error, non monotone timestamps 1119949284664561 >= 1119949284612317 error, non monotone timestamps 1119949284925767 >= 1119949284873523 error, non monotone timestamps 1119949286571453 >= 1119949286545331 WMP connects and starts buffering. But right as it should start playing, it stops and goes into 'waiting' state (that's what it says on the status bar). Ffserver uses the same options for format, codecs and bitrates as were used in 'ffmpeg' example. If I try to play a stream from the file (created by previos ffmpeg example), it starts playing but it re-buffers every couple of seconds - even though the network should be fast enough (tested on LAN) and the encoding machine is not too busy (about 40% CPU usage). Did any of you have better luck using the ffserver with ffmpeg (with recent versions, that is)? Thanks, D. PS: Right now I'm using an earlier version which kind of works - the WMP plays (both the file and live) but it re-bufferes every couple of seconds...

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what about speex?
by fl0ppy1＠gmail.com 07 Dec '05

07 Dec '05

I tried this audio codec anmd it's very good, based in ogg vorbis.

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mpeg2video support in ffmpeg
by 1.41421＠gmail.com 18 Nov '05

18 Nov '05

I am trying to convert a bunch of AVI files, which were obtained by uploading a tape from and NTSC camcorder, into PAL MPEG files, so that I can burn my own PAL DVDs with them. I am using the any2vob script, which makes heavy use of ffmpeg. One of the steps involves invoking ffmpeg as follows: ffmpeg -y -i file.avi -map 0:1 -ar 48000 -ab 384 file.ac3 -map 0:0 -f mpeg2video -s 720x480 -padtop 24 -padbottom 24 -hq -b 5000 -r pal to which ffmpeg replies the following: Seems that stream 0 comes from film source: 25.00->nan Input #0, avi, from 'file.avi': Duration: 00:01:40.2, bitrate: 5239 kb/s Stream #0.0: Video: mpeg4, 720x480, 25.00 fps Stream #0.1: Audio: mp3, 48000 Hz, stereo, 224 kb/s Unknown input or output format: mpeg2video How is ffmpeg so that it supports the mpeg2video format? I am confused, for the output from ffmpeg -formats contains a line that reads DEVSDT mpeg2video which seems to indicate that ffmpeg knows about this format.

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Complex error
by eric＠jadenshouse.com 07 Nov '05

07 Nov '05

I am trying to use ffmpeg to convert an avi to mpg (mpeg 2). This command works on the CLI in Windows, but is failing on my Linux box. Can someone help me decipher what is wrong? Command: ffmpeg -i VIDEO_FILE_IN -hq -target ntsc-dvd -b 6000 -aspect 4:3 -s 720x480 -acodec mp2 -ab 224 -ac 2 -mbd 2 -qmin 2 -async 1 -y VIDEO_FILE_OUT Error: ffmpeg: motion_est.c:1961: ff_fix_long_p_mvs: Assertion `range <=256 || !(s->codec_id == CODEC_ID_MPEG2VIDEO && s->avctx->strict_std_compliance >= 0)' failed. Aborted Thanks, Eric

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frame duplicate
by knowdet＠yahoo.com 03 Nov '05

03 Nov '05

Hi! I'm using avcodec, avformat libraries for encoding. Sometimes for syncronization reasons the program needs frame duplication, and i could only make this happen, with the same frame re-encoding. The question is, is there any way to duplicate (increase timestamps, ....) without encoding. Thanks in advance! __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com

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