July 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. ______________________________________________________________________

2 1

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

2 1

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...

2 1

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.

1 1

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.

3 2

Minimum CPU requrement for DivX? Experiences?
by danci＠agenda.si 03 Sep '05

03 Sep '05

Hi, I'm considering building a portable digital VCR for use in vehicles or on motorcycles. I was going to use the VIA EPIA-N (Nano-ITX) platform, which offers very small form factor (120x120 mm) and is available with 533MHz, 800MHu or 1GHz VIA processors. I'd like to use PAL resolution, 25 fps and 'reasonable quality'. Can 1GHz processor cope with that? Thanks, D.

5 4

Compatibility with PSP fw 2.0?
by arara＠wwalex.com 09 Aug '05

09 Aug '05

I just upgraded the PSP firmware to the version 2.0 and the movies encoded with ffmpeg doesn't seem to work anymore. The movies are encoded with ffmpeg version 0.4.9-pre1, build 4757 on Mac Os X by using the following parameters: ffmpeg -y -i "$1" -title "$3" -timestamp "2005-06-23 13:00:00" -bitexact -s 320x240 -r 29.97 -b 768 -acodec aac -ac 2 -ar 24000 -ab 64 -f psp "$2.mp4" The movies played fine on the 1.52 version. Now I have got an error when I try to play them. In the information screen the movie length is correct but the title is empty and the bitrate is wrong (it shows 192 kbps). Any idea? Many thanks. Alessandro

3 2

motion vector estimation parameter problem
by hungusyd＠gmail.com 05 Aug '05

05 Aug '05

Hi all, I tried to use the option "-me" to specify differenet MV estimation methods but didnt see any effect. ffmpeg kept producing encoded videos with the same time for all MV E methods. I looked at the source code and saw that most of MVE are left out (#if 0). I tried to go to ffmpeg.c and changed the static me_method to ME_ZERO to test but still had no luck. Could someone show me how to switch these MVE methods so that I can benchmarking them? Thanks

3 9

PSP AVC (w/Firmware 2.0)
by skerb1＠yahoo.com 02 Aug '05

02 Aug '05

Hi All, I have done some research the last couple of days on getting H.264 working on my psp. From what I currently understand you need to put the video in the MP_ROOT/10xANV01 directory with a name like MAQxxxxx.MP4 However I used ffmpeg to encode the video with h.264 and it didn't work properly on the psp. I did a little more digging and it looks like there needs to be some kind of sony atom in the header. Does anyone have an idea on this? Has anyone been able to find out how this atom is put together? Is it encrypted? One other thing that I have noticed is that videos in the original psp format do not work anymore on this new format. Does the old format also need this sony atom or header in the file?

2 3

Single format for Win, Mac and linux?
by darren＠dcook.org 02 Aug '05

02 Aug '05

Hi, I've read the following page: http://ffmpeg.sourceforge.net/compat.php but it avoids the topic of what if I want a single format that will play on both Windows and Mac (and linux, though mplayer seems to take almost everything I throw at it recently). Can anyone suggest something that may work? Or really easy instructions I can give to either the Windows-owning relatives or the Mac-owning relatives to get them to play the other's format? Thanks in advance, Darren P.S. The video I'm making is very compact: 192x144, 3fps, and DivX ( using "-vtag divx" ). It works on WinXP, but Mac apparently complains about not having a decompresser.

5 5