February 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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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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compile failure on MacOS X
by herve.flores＠free.fr 07 Mar '06

07 Mar '06

Le 23 f?vr. 06 ? 16:15, ffmpeg-user-request at mplayerhq.hu a ?crit : > ------------------------------ > > Message: 7 > Date: Thu, 23 Feb 2006 15:38:29 +0100 > From: Christian Ebert <blacktrash at gmx.net> > Subject: [Ffmpeg-user] compile failure on MacOS X > To: ffmpeg-user at mplayerhq.hu > Message-ID: <20060223143829.GA8712 at krille.blacktrash.org> > Content-Type: text/plain; charset=us-ascii > > Hello everybody, > > My last working ffmpeg (on MacOS 10.3.9) gives: > > $ ffmpeg -version > FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard > configuration: --prefix=/usr/local --enable-pp --enable-pthreads > --disable-ffserver --enable-gpl --enable-a52 --enable-faac --enable- > faad --enable-faadbin --enable-mp3lame --enable-vorbis --enable- > theora --enable-libogg --powerpc-perf-enable --extra-libs=/sw/lib/ > libfaad.dylib /sw/lib/libmp3lame.dylib /sw/lib/libogg.dylib /sw/lib/ > libFLAC.dylib /sw/lib/libFLAC++.dylib /sw/lib/libOggFLAC++.dylib / > sw/lib/liba52.dylib /sw/lib/libvorbis.dylib /sw/lib/ > libvorbisenc.dylib /sw/lib/libvorbisfile.dylib /sw/lib/ > libtheora.dylib /sw/lib/libdv.dylib /sw/lib/liblzo.dylib /sw/lib/ > libxvidcore.dylib /usr/local/lib/libSDL.dylib /usr/local/lib/ > libfaac.dylib /sw/lib/libesd.dylib /sw/lib/libaudiofile.dylib /sw/ > lib/libImlib2.dylib /sw/lib/libquicktime.0.dylib > libavutil version: 49.0.0 > libavcodec version: 51.7.0 > libavformat version: 50.3.0 > built on Feb 20 2006 00:05:35, gcc: 3.3 20030304 (Apple Computer, > Inc. build 1671) > ffmpeg CVS > libavutil 3211264 > libavcodec 3344128 > libavformat 3277568 > > More recent versions (after Feb 20) don't compile with the > following error: > the verbose looks like strange... you want to build an universalBinary with only one cpusubtype? (the configure tool cannot do it) -force_cpusubtype_ALL and altivec seems not to be compatible > cc -O3 -g -Wall -Wno-switch -g -O3 -I/sw/include -no-cpp-precomp - > pipe -fomit-frame-pointer -force_cpusubtype_ALL -Wno-sign-compare - > faltivec -mdynamic-no-pic -DHAVE_AV_CONFIG_H -I.. -I/usr/local/src/ > ffmpeg/libavutil -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE - > D_GNU_SOURCE -c -o ppc/dsputil_h264_altivec.o ppc/ > dsputil_h264_altivec.c > In file included from ppc/dsputil_h264_altivec.c:37: > ppc/dsputil_h264_template_altivec.c: In function > `put_h264_chroma_mc8_altivec': > ppc/dsputil_h264_template_altivec.c:52: warning: `vsrcBuc' might be > used uninitialized in this function > ppc/dsputil_h264_template_altivec.c: In function > `put_h264_qpel16_h_lowpass_altivec': > ppc/dsputil_h264_template_altivec.c:281: warning: unused variable > `vdst' > ppc/dsputil_h264_template_altivec.c: In function > `put_h264_qpel16_v_lowpass_altivec': > ppc/dsputil_h264_template_altivec.c:395: warning: unused variable > `vdst' > ppc/dsputil_h264_template_altivec.c: In function > `put_h264_qpel16_hv_lowpass_altivec': > ppc/dsputil_h264_template_altivec.c:429: error: incompatible types > in initialization > ppc/dsputil_h264_template_altivec.c:624: warning: unused variable > `vdst' > In file included from ppc/dsputil_h264_altivec.c:57: > ppc/dsputil_h264_template_altivec.c: In function > `avg_h264_qpel16_hv_lowpass_altivec': > ppc/dsputil_h264_template_altivec.c:429: error: incompatible types > in initialization > make[1]: *** [ppc/dsputil_h264_altivec.o] Error 1 > make: *** [lib] Error 2 > > > Ideas anyone? > > TIA > > c > -- > _B A U S T E L L E N_ lesen! --->> <http://www.blacktrash.org/ > baustellen.html> first give your "configure parameters"? it maybe give us an idea bye Herv?

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MPEG TS
by gilad_no＠yahoo.com 28 Feb '06

28 Feb '06

I'm trying to encode into MPEG TS. I can create a .ts file and send it using udp (I can see both outputs using VLC). But when I try to stream it again (using VLC), I get the following errors: access_output_udp debug: packet has been sent too late (624732071053) access_output_udp debug: packet has been sent too late (624732034211) access_output_udp debug: packet has been sent too late (624731997369) main warning: late buffer for mux input (624732658000) main warning: late buffer for mux input (624732618000) main warning: late buffer for mux input (624732578000) main warning: late buffer for mux input (624732538000) access_output_udp debug: late packet for udp input (624732148527) access_output_udp debug: late packet for udp input (624732071334) I'm not sure where the problem is. Here is my code: while (WaitForSingleObject(m_Stop,0)==WAIT_TIMEOUT) { for (int nTotal=0,nRead=0;nTotal<sizeof(SRCImage) && (nRead=Video.Receive(SRCImage+nTotal,sizeof(SRCImage)-nTotal))>0;nTotal+=nRead); if (nRead<0) { ATLTRACE(_T("Aborting\n")); break; } img_resample(pResample,pDSTPicture,pSRCPicture); AVFrame* pPicture=(AVFrame*)pDSTPicture; int nCount=((nFrames % 5)<2) ? 2 : 3; // Convert from 10 to 25 FPS for (int nIndex=0;nIndex<nCount;nIndex++,nFrames++) { int nSize=avcodec_encode_video(&pVideo->codec,VideoBuffer,sizeof(VideoBuffer),pPicture); if (nSize) { AVPacket Packet={0}; av_init_packet(&Packet); //Packet.dts=Packet.pts=pVideo->codec.coded_frame->pts; if (pVideo->codec.coded_frame->pts!=AV_NOPTS_VALUE) Packet.pts=av_rescale_q(pVideo->codec.coded_frame->pts,pVideo->time_base,pVideo->time_base); if (pVideo->codec.coded_frame->key_frame) Packet.flags|=PKT_FLAG_KEY; Packet.stream_index=pVideo->index; Packet.data=VideoBuffer; Packet.size=nSize; ATLVERIFY(av_interleaved_write_frame(m_pContext,&Packet)==0); ATLTRACE(_T("Encoding frame %dx%d(%d)\n"),nFrames,nCount,(int)Packet.pts); } else { ATLTRACE(_T("Encoding frame $\n")); } } pVideo->codec.frame_number++; } This is how I initialize the codec: m_pContext=av_alloc_format_context(); AVOutputFormat* pFormat=guess_format("mpegts",NULL,NULL); m_pContext->oformat=pFormat; AVStream* pVideo=av_new_stream(m_pContext,STREAM_TYPE_VIDEO_MPEG2); pVideo->codec.codec_id=pFormat->video_codec; pVideo->codec.codec_type=CODEC_TYPE_VIDEO; pVideo->codec.bit_rate=2048*1024;//400000; pVideo->codec.width=DST_WIDTH; pVideo->codec.height=DST_HEIGHT; pVideo->codec.frame_rate=STREAM_FRAME_RATE; // 25 pVideo->codec.frame_rate_base=1; pVideo->codec.gop_size=12; pVideo->codec.max_b_frames=2; I can play the output using VLC, but the packets are not entirely valid and don't work on other players. Regards, Gilad Novik

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ffmpeg Windows question
by wbeebe＠gmail.com 28 Feb '06

28 Feb '06

Does anyone know how (or is there sample code) for attaching to a USB webcam under Windows? I can use ffmpeg to open a USB webcam under Linux (as /dev/video0, for example) just fine. I need that same capability under Windows. Thanks.

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Re: [MPlayer-users] mplayer fails compiling on Mac OS X 10.3.9
by ergzay＠everyoneproductions.com 27 Feb '06

27 Feb '06

On 2006/02/25, at 23:00, Mohammad A. Haque wrote: > > On Feb 25, 2006, at 22:52, Ergzay wrote: >> >> On 2006/02/25, at 1:36, Ergzay wrote: >>> >>> On 2006/02/22, at 11:04, Guillaume POIRIER wrote: >>>> >>>> On 2/22/06, Ergzay <ergzay at everyoneproductions.com> wrote: >>>>> I used configure with default options and am using latest CVS as of >>>>> when this was sent. It fails with this error after some time. >>>>> Compiling >>>>> on a G4 ibook. >>>>> >>>>> cc -I../libvo -I../../libvo -I/usr/X11R6/include -O4 -mcpu=7450 >>>>> -mtune=7450 -faltivec -D__APPLE_ALTIVEC__ -pipe -ffast-math >>>>> -fomit-frame-pointer -mdynamic-no-pic -falign-loops=16 -DSYS_DARWIN >>>>> -DCONFIG_DARWIN -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 >>>>> -DHAVE_AV_CONFIG_H -I.. -I/Users/ergzay/main/libavutil >>>>> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE -c -o >>>>> ppc/dsputil_h264_altivec.o ppc/dsputil_h264_altivec.c >>>>> In file included from ppc/dsputil_h264_altivec.c:37: >>>>> ppc/dsputil_h264_template_altivec.c: In function >>>>> `put_h264_qpel16_hv_lowpass_altivec': >>>>> ppc/dsputil_h264_template_altivec.c:429: error: incompatible types >>>>> in >>>>> initialization >>>>> In file included from ppc/dsputil_h264_altivec.c:57: >>>>> ppc/dsputil_h264_template_altivec.c: In function >>>>> `avg_h264_qpel16_hv_lowpass_altivec': >>>>> ppc/dsputil_h264_template_altivec.c:429: error: incompatible types >>>>> in >>>>> initialization >>>>> make[1]: *** [ppc/dsputil_h264_altivec.o] Error 1 >>>>> make: *** [libavcodec/libavcodec.a] Error 2 >>>> >>>> Could you find what commit broke OSX port? >>>> If necessary, follow those instructions: >>>> http://www.mplayerhq.hu/DOCS/HTML/en/bugreports_regression_test.html >>> >>> The bug happens between 2006-02-21 17:24:18 and 17:24:19. >> >> Sorry to double post but I think this isn't being seen because I >> didn't write a long enough message. I did the regression test and it >> stops working with commit listed above. So could this please be >> fixed? > > Code compiles fine under 10.4.x so it's most likely an issue of > supporting 10.3 and 10.4. libavcodec comes from the ffmpeg project. > I'd forward a note there and you might see a fix faster. > > http://ffmpeg.sourceforge.net/mailinglists.php So, as said above I'm sending it to the ffmpeg mailing list. Ergzay

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hardware acceleration or mobo/cpu/ram tradeoffs?
by james＠freelancepropaganda.com 27 Feb '06

27 Feb '06

Hi, I use ffmpeg on Knoppmyth to convert from MPEG2 created by a Hauppauge PVR-500 to mpeg4 divx with (using a myth2ipod script from here: http://www.myth2ipod.com/ that I've tweaked just a little. It uses these options: -y -cropleft 10 -cropright 10 -croptop 8 -cropbottom 8 -deinterlace - vcodec xvid -s 320x240 -r 29.97 -b 384 -qmin 2 -qmax 5 -bufsize 4096 - acodec aac -ab 96 -g 300 Currently this works great but is pretty slow, because I'm running a Celeron 700Mhz with about 128 MB of slow ram. (yes, I know) My questions are: a) are there any PCI or GPU boards that ffmpeg can use to do hardware accelerated conversions like MPEG2 to MPEG4 (divx or H.264)? (I've looked up the new Nvidia boards but I'm confused as to their capabilities in this regard and on linux in general, and XvMC seems to be only for playback, right?) b) if the answer is no, or yes but they are really expensive, then I'll be buying a new MoBo/CPU combo, so is there any set-up (type of MoBo or type of CPU) that works best for such a task? Should I focus on memory speed/bus speed? Anywhere I can learn about the trade off between RAM and CPU speed? Thanks, James

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Libavcodec and CBR problem
by fabio＠hostname.org 26 Feb '06

26 Feb '06

Hey guys! I'm trying to do a little stream application using libavcodec. It works fine using MPEG4, except the bitrate control is not accurate. I mean, it has some influency over the resulting bandwith, but when fast motion happens, my bitrate value appears to be ignored. and it overflow my network bandwith - ( i'm doing stream over udp, so i start to loose packets ) Do i have to calculate context->qmin and context->qmax for each bitrate option? Do i have to use ff_rate_estimate_qscale ( ratecontrol.c ) on my own code? Can CBR be really accurate? , ex: to really enforce bitrate values? Thanks!

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Crazy "Rolling" colors when encoding from mythtv/1080i?
by mboorshtein＠gmail.com 25 Feb '06

25 Feb '06

Hello, I've installed mythtv and ffmpeg (from CVS last night). When I try to encode from a 1080i recording (it doesn't matter what the final format is) the result has "rolling" collors. I used nuvexport to generate the file. The mythtv people say its an encoding issue. Has anyone else ran into this issue or is there a fix/workaround? Thanks Marc

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MPEG-2 Problems
by bbrice＠newtek.com 25 Feb '06

25 Feb '06

Greetings, I've been testing some code for outputting MPEG-2 videos and I've been having some problems. First I checked what was wrong with my code, then tried to verify things with the main ffmpeg program. It seems the program does the same. The problem that I'm getting is that the MPEG-2 video format that ffmpeg outputs doesn't seem to be correct. In all of the players I've tested with, the duration time of the video is WAY off (such as really huge or even a negative number), and others can't even play it. Here's a sample invocation of ffmpeg that I've used: ffmpeg -i ffmpeg-sample.mpg test.m2v The "ffmpeg-sample.mpg" is the file produced by the output_example program, but the problem persists with any kind of input video. I did try converting the file with: ffmpeg -i ffmpeg-sample.mpg -vcodec mpeg2video test.mpg This used the mpeg output format and mpeg2video codec, which the regular mpeg output format seems to be for MPEG-1. Anyone else experience this? Any solutions? Is the mpeg2video output format "complete" or what? Thanks in advance. :-) -- Brian Brice In order to know recursion, you must first know recursion...

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