May 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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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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problem in uyvy422 conversion
by mangeshsk＠gmail.com 26 Jul '05

26 Jul '05

Hello, Im getting segmentation fault while converting a 420 planer yuv image to uyvy422 yuv format. What may be the possible error? ./ffmpeg -s 720x480 -f rawvideo -pix_fmt yuv420p -i tempete_720_480_420.yuv -s 720x480 -f rawvideo -pix_fmt uyvy422 tempete_720_480_uyvy422.yuv Thanks Mangesh

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a/v sync, canon camera 4800X problem
by heitzso＠bellsouth.net 10 Jul '05

10 Jul '05

I am working on a project with 55 DV tapes, roughly half of which originated (I believe) with a Canon camera with the 48009 constant audio bit rate problem. (variously reported as 48005 to 48009 on the internet) What that means is if you view the DV file straight the A/V sync is fine. But if you split out the A/V streams, compress, and join them back together you end up with a slowly increasing A/V sync problem that starts to be noticable after 15 or 20 minutes. I'm having an incredibly difficult time trying to compress these broken files because most tools assume the audio is to spec and is 48000. And they won't let you override the spec 48000 with 48008. I've managed to split out the audio stream using ffmpeg to a wav file, then use ecasound -ei to alter the length of the file, but ecasound's -ei parameter doesn't hold enough precision for the very small (but absolutely critical) adjustment I need ( -ei 100.018141% ). I don't know how to resample between 4800x and 48000 because the audio file split out from the DV file claims it is 48000 already. I would GREATLY appreciate help. This is beating me to a pulp! For a reference see http://www.adamwilt.com/DV-FAQ-tech.html#LockedAudio "This was revealed at NAB '99 by Randy Ubillos, lead engineer on Final Cut Pro, who has found that while most DV cameras are pretty good, Canon cameras grab 48kHz sound at around 48.009 kHz, which can result in almost a second of video/audio slippage over the course of an hour (or around one frame every two minutes)." THANKS Heitzso

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Create movie trailer with ffmpeg
by vvatashki＠gmail.com 07 Jun '05

07 Jun '05

Hello guys I want to create movie trailers with ffmpeg. I have different size videos from 2 mins to 1 hour. What is the correct way to create trailer ? I want them below given size for example 10-15Mb. What if I capture every one of ten frames.Will it do the job ? Or i have to capture {__} seconds for every 5 mins for example? Please give suggestions Thanks -- Venci Vatashki

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Windows Xp OS with a service pack 2.0 - problem with FFmpeg Code
by sunil_j＠conceptemsys.com 02 Jun '05

02 Jun '05

Hi, We are implementing a project, which detects I-Frame's. Project name is I-Frame Detection, we are using FFmpeg source code version 0.4.9 pre. We are building project in VC++ 6.0, we are facing problem while running the code on Windows Xp OS with a service pack 2.0. For windows 2000 OS code is working as per our expectations. We have called a function av_find_stream_info() which is causing the error when we execute our code, the error which we are getting is " Unhandled exception in I_frame_detection.exe(MSVCRT.DLL 0xC0000005 : Access Violation " Can you suggest solution on this problem Thanks in advance, Regards, Sunil Jadhav Sr.Software Engineer (DSP Group) Concept Embedded Systems Pvt. Ltd. Salunkhe Crystal, Sr. No. 1/8/1, NDA-Pashan Road, Bavdhan, Pune 411 021, India Tel: +91-20-22953051 Fax: +91-20-22951929 Cell: +91-9371005571

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ffmpeg : porduce mpegts with Program Clock Reference (PCR) field ?
by brice.ruzand＠wanadoo.fr 31 May '05

31 May '05

A friends ask me if it was possible to convert a MP4 movie in MPEG2-TS with some free software. I do it for him using FFMPEG, but he said that their is no Program Clock Reference (PCR) field, so he can not stream it properly. Is it possible to set it properly with ffmpeg or with an other tools ? Thanks, brice.

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FEC in MPEG TS?
by vato＠wnet.ua 31 May '05

31 May '05

Hi! Is there any solution to produce FEC (forward error coding) in ffmpeg? I need to produce 3/4 or 2/3 FEC in MPEG stream? Can anybody help me? -- Viktor Kompaneyets Wnet project manager

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New "map" parameter definition
by mathieu.minard＠labri.fr 31 May '05

31 May '05

Hi, Could someone explain me the meaning and how to use the extended "map" parameter: "file;stream[:syncfile:syncstream]"? Thank you, ---------------------- Mathieu Minard Phone : +33 (0) 5.56.84.44.50 Fax : +33 (0) 5.56.84.21.80 URL : http://phoenix.labri.fr/people/minard

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error, non monotone timestamps
by j.rojas＠tiba.com 30 May '05

30 May '05

Hello, I am running the latest CVS version of ffmpeg (2005-05-30) and I have some problems when I try to access a live feed from WMP or RealPlayer. ffserver and ffmpeg seem to work well until a client session is launched. In this point, ffserver starts logging several "error, non monotone timestamps ..." and buffer underflow messages. I had tried with older versions and the problem is the same. I tried ffmpeg capturing to a file and it worked well. I had also tried ffserver streaming a file and it worked well too. I attach ffserver's configuration and ffmpeg command line. Please, let me know if you need more information. Regards Juan ffserver.conf : ============================================================================ Port 8090 BindAddress 0.0.0.0 MaxClients 10 MaxBandwidth 1000 CustomLog - NoDaemon <Stream stat.html> Format status ACL allow localhost ACL allow 10.1.0.0 10.1.0.255 </Stream> # Redirect index.html to the appropriate site <Redirect index.html> URL http://ffmpeg.sourceforge.net/ </Redirect> <Feed feed1.ffm> File /streaming/tmp/feed1.ffm FileMaxSize 40M ACL allow localhost ACL allow 10.1.0.0 10.1.0.255 </Feed> <Stream test1.mpg> Feed feed1.ffm # Format of the stream : you can choose among: # mpeg : MPEG1 multiplexed video and audio # mpegvideo : only MPEG1 video # mp2 : MPEG2 audio (use AudioCodec to select layer 2 and 3 codec) # ogg : Ogg format (Vorbis audio codec) # rm : Real Networks compatible stream. Multiplexed audio and video. # ra : Real Networks compatible stream. Audio only. # mpjpeg : Multipart JPEG (works with Netscape without any plugin) # jpeg : Generate a single JPEG image. # asf : ASF compatible streaming (Windows Media Player format). # swf : Macromedia flash(tm) compatible stream # avi : AVI format (open divx video, mpeg audio sound) # master : special ffmpeg stream used to duplicate a server Format mpeg #PreRoll 15 #NoVideo VideoBitRate 256 VideoFrameRate 25 VideoSize 320x240 VideoBufferSize 1000 VideoQMin 2 VideoQMax 25 VideoIntraOnly #VideoGopSize 25 #VideoHighQuality #VideoCodec mpeg1video NoAudio AudioBitRate 0 AudioChannels 1 AudioSampleRate 44100 AudioCodec mp2 # ACL: ACL ALLOW localhost ACL ALLOW 10.1.0.0 10.1.0.255 #ACL DENY <first address> </Stream> ============================================================================ ffmpeg http://localhost:8090/feed1.ffm ffmpeg version 0.4.9-pre1, build 4755, Copyright (c) 2000-2004 Fabrice Bellard configuration: --prefix=/usr --enable-shared-pp --enable-shared --disable-static --disable-mmx --disable-altivec --disable-debug --enable-mp3lame --disable-a52 --disable-a52bin --enable-audio-oss --enable-v4l --disable-dv1394 --disable-dc1394 --disable-pthreads --enable-xvid --enable-ogg --enable-vorbis --disable-dts --enable-network --enable-zlib --enable-ffplay --disable-faad --disable-faac --disable-faadbin --enable-gpl --enable-pp --disable-opts built on May 30 2005 16:06:11, gcc: 3.3.5 (Gentoo Linux 3.3.5-r1, ssp-3.3.2-3, pie-8.7.7.1) Input #0, video4linux, from '': Duration: N/A, bitrate: N/A Stream #0.0: Video: rawvideo, yuv420p, 320x240, 25.00 fps Input #1, audio_device, from '': Duration: N/A, bitrate: N/A Stream #1.0: Audio: pcm_s16le, 44100 Hz, mono, 705 kb/s Output #0, ffm, to 'http://localhost:8090/feed1.ffm': Stream #0.0: Audio: mp2, 44100 Hz, mono, 64 kb/s Stream #0.1: Video: mpeg1video, yuv420p, 320x240, 25.00 fps, q=2-25, 256 kb/s Stream mapping: Stream #1.0 -> #0.0 Stream #0.0 -> #0.1 [mpeg1video @ 0xb7f08148]removing common factors from framerate Press [q] to stop encoding [mpeg1video @ 0xb7f08148]rc buffer underflow Broken pipe q=0.0 size= 1008kB time=25.3 bitrate= 326.1kbits/s

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