May 2006 - 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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Spam, spam, spam
by darren＠dcook.org 13 Jul '06

13 Jul '06

Hi Administrators, Did the mailing list configuration change recently? We suddenly (the past week or two) seem to be getting a lot of spam. Can it be changed back to only subscribers can post. Thanks for your time spent on the boring admin duties, Darren

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No Audio When Converting To .FLV
by patrickkonsor＠pkbase.com 09 Jun '06

09 Jun '06

Hello, It seems when I convert videos to .FLV the audio is not converted. I configured ffmpeg as.. ./configure --prefix=/usr --enable-shared --enable-mp3lame Here's the command.. ffmpeg -i video.wmv -r 25 video.flv And the output.. ffmpeg version 0.4.9-pre1, build 4718, Copyright (c) 2000-2004 Fabrice Bellard built on May 26 2006 01:27:32, gcc: 3.4.4 20050721 (Red Hat 3.4.4-2) Input #0, asf, from 'video.wmv': Duration: 00:00:48.7, bitrate: 230 kb/s Stream #0.0: Audio: wmav2, 32000 Hz, stereo, 32 kb/s Stream #0.1: Video: wmv1, 320x240, 1.00 fps File 'video.flv' already exists. Overwrite ? [y/N] y Output #0, flv, to 'video.flv': Stream #0.0: Video: flv, 320x240, 25.00 fps, q=2-31, 200 kb/s Stream mapping: Stream #0.1 -> #0.0 [flv @ 0xb92130]removing common factors from framerate Press [q] to stop encoding [asf @ 0x610770]ff asf bad header 90 at:1403444ate= 237.6kbits/s [asf @ 0x610770]ff asf skip 2815 0 frame= 1209 q=7.1 Lsize= 1402kB time=48.4 bitrate= 237.5kbits/s video:1383kB audio:0kB global headers:0kB muxing overhead 1.366884% As you can see, the input has both a video and audio stream, but the output has only a video stream. I've attempted to convert .MPG and .AVI as well but nothing seems to convert sound for me. Any help is appreciated. Thanks! Patrick Konsor

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mp4a support?
by dan＠juicewireless.com 07 Jun '06

07 Jun '06

Hi everyone, I am trying to use ffmpeg to convert a 3gp file to flv (flash video). I get an error with the audio file because it looks like my compile of ffmpeg cannot recognize mp4a. Is there any way to get ffmpeg to recognize this format? I tried to do a recompile of the latest cvs of ffmpeg but still no luck. Here is the output: -bash-3.00$ ffmpeg -i test.3gp test.flv FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-amr_nb libavutil version: 49.0.0 libavcodec version: 51.8.0 libavformat version: 50.4.0 built on Apr 3 2006 04:18:31, gcc: 3.4.5 20051201 (Red Hat 3.4.5-2) Seems that stream 0 comes from film source: 1000.00 (1000/1) -> 15.00 (15/1) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.3gp': Duration: 00:00:30.5, start: 0.000000, bitrate: 139 kb/s Stream #0.0(eng), 15.00 fps(r): Video: mpeg4, yuv420p, 176x144 Stream #0.1(eng): Audio: mp4a / 0x6134706D, 16000 Hz, stereo Output #0, flv, to 'test.flv': Stream #0.0, 15.00 fps(c): Video: flv, yuv420p, 176x144, q=2-31, 200 kb/s Stream #0.1: Audio: mp3, 16000 Hz, stereo, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Unsupported codec (id=86018) for input stream #0.1 -bash-3.00$ Thanks. Dan.

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ffmpeg file info as xml
by remann＠signal7.de 04 Jun '06

04 Jun '06

Hi, I know that I can use ffmpeg with the input file only to get the properties of the input file (ffmpeg -i test.xyz). This info is text only. Is it possible to get this output as xml? I want to parse it in a nice way to optain the file properties (codec, duration, ...). thanks in advance Alexander Remann

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Can't compile on OSX
by musyne＠altern.org 02 Jun '06

02 Jun '06

Hi, I'm using Tiger 10.4.6 with XCode 2.3 on PPC. I have the latest svn version of ffmpeg. I have fink, which I used to install xvid, faac, ... I compiled x264 from cvs. I can't compile ffmpeg, even wihout --enable-x264 and --enable-xvid... It stops while compiling faad.h or something. I tried to enable the options I want (faac, x264, xvid) by modifying the .info file from fink and trying to install ffmpeg with fink (that usualy works), but it crash. Any solution ? Thx, Alexis

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MPEG-2 TS Encoding
by erojas＠google.com 01 Jun '06

01 Jun '06

Hi, all. I'm new here. I'm looking at the documentation for ffmpeg and it appears that MPEG-2 TS is not a supported encoding (output) format. Is this correct? If so any ideas about where I might get a (source preferred, but maybe not required) simple MPEG Transport multiplexer? thanks, emilio

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DOES FFMPEG USE UDP?
by amitborlikar＠gmail.com 01 Jun '06

01 Jun '06

Hello experts, I am a newbe to this list. I juts had a small doubt whether FFMPEG uses TCP or UDP for its protection. Waiting for your reply. Regards, Amit

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Grab video with no audio?
by stevesz＠enternet.hu 31 May '06

31 May '06

It's simple. Use the -an switch. bye Steve On Wed May 31 2:07 , 'John Clonts' <john at clonts.org> sent: >Sorry if its a dumb question but I did RTFM and couldn't find it. > >I have no audio device, but want to capture video. > >What option do I give ffmpeg to avoid its complaint "Could not find >audio grab device"? > >I tried /dev/null but that didn't work :) > >Thanks! >John >_______________________________________________ >ffmpeg-user mailing list >ffmpeg-user at mplayerhq.hu >http://lists.mplayerhq.hu/cgi-bin/mailman/listinfo/ffmpeg-user >

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Crash processing M4V file
by matthew＠allpeers.com 31 May '06

31 May '06

I'm trying to extract a frame from an M4V file using code based on Martin Bohme's tutorial. The main loops reads a bunch of packets from the appropriate stream, but suddenly crashes with the following (strange-looking) stack trace: apFile.dll!_ac3_common_init() + 0x28433 apFile.dll!_ac3_common_init() + 0x295b0 apFile.dll!_ac3_common_init() + 0x31dbd apFile.dll!_ac3_common_init() + 0x33b63 apFile.dll!_ac3_common_init() + 0x345b0 apFile.dll!_avcodec_decode_video() + 0xf2 I am linking the MingW32-build libav* libraries to my C++ application, built with MSVC7.1. I am using the latest CVS snapshot since the server is down. The file in question has the following streams: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'myfile.m4v': Duration: 00:02:30.2, start: 0.000000, bitrate: 672 kb/s Stream #0.0(eng): Audio: mp4a / 0x6134706D, 44100 Hz, stereo Stream #0.1(eng), 23.98 fps(r): Video: h264, yuv420p, 320x132 FFMpeg seems to be able to read and convert the file without a problem. Can anyone tell me why this is crashing? Thanks in advance, Matt

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