August 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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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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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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unsubcribe
by kperry＠studiokproductions.com 16 Oct '05

16 Oct '05

--- --- | Keith C. Perry, President | | Studio K Productions LLC | | http://studiokproductions.com | --- --- ____________________________________ This email account is being host by: VCSN, Inc : http://vcsn.com

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Trouble converting certain quicktime files into flv format.
by ducky＠flukiest.com 08 Sep '05

08 Sep '05

I am having a hard time converting certain quicktime movies into flv format. Some quicktime movies convert some do not. The difference is obviously the bitrate and the audio in the quicktime movies. I am using the latest from cvs. Below are the details. Thanks! [root at yosemite movies]# ffmpeg -version ffmpeg version CVS, build 3211266, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-gpl built on Aug 18 2005 14:16:34, gcc: 3.3.3 20040412 (Red Hat Linux 3.3.3-7) ffmpeg CVS libavcodec 3211266 libavformat 3211520 Is there something I am doing wrong? The movies that are working are listed below: command: ffmpeg -i fireworks1.mov -hq -acodec mp3 -ar 22050 -ab 32 -f flv -s 320x240 -aspect 4:3 -y fireworks1.flv results: ffmpeg version CVS, build 3211266, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-gpl built on Aug 18 2005 14:16:34, gcc: 3.3.3 20040412 (Red Hat Linux 3.3.3-7) Input #0, mov,mp4,m4a,3gp,3g2, from 'fireworks1.mov': Duration: 00:00:39.0, start: 0.000000, bitrate: 1376 kb/s Stream #0.0: Video: mjpeg, yuvj422p, 320x240, 10.00 fps Stream #0.1: Audio: pcm_u8, 8000 Hz, mono, 64 kb/s Output #0, flv, to 'fireworks1.flv': Stream #0.0: Video: flv (hq), yuv420p, 320x240, 10.00 fps, q=2-31, 200 kb/s Stream #0.1: Audio: mp3, 22050 Hz, mono, 32 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press [q] to stop encoding frame= 390 q=0.0 Lsize= 1214kB time=39.0 bitrate= 254.9kbits/s video:1032kB audio:153kB global headers:0kB muxing overhead 2.488513% Size of fireworks1.flv = 1242664 The movies that are not working are listed below: command: ffmpeg -i digtrailer.mov -hq -acodec mp3 -ar 22050 -ab 32 -f flv -s 320x240 -aspect 4:3 -y digtrailer.flv results: ffmpeg version CVS, build 3211266, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-gpl built on Aug 18 2005 14:16:34, gcc: 3.3.3 20040412 (Red Hat Linux 3.3.3-7) Input #0, mov,mp4,m4a,3gp,3g2, from 'digtrailer.mov': Duration: 00:02:09.4, start: 0.000000, bitrate: 353 kb/s Stream #0.0: Video: svq3, yuv420p, 320x240, 15.00 fps Stream #0.1: Audio: 0x6134706d, 24000 Hz, stereo Output #0, flv, to 'digtrailer.flv': Stream #0.0: Video: flv (hq), yuv420p, 320x240, 15.00 fps, q=2-31, 200 kb/s Stream #0.1: Audio: mp3, 22050 Hz, stereo, 32 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Unsupported codec (id=86018) for input stream #0.1 ------------ command: ffmpeg -i hunches_low_bitrate.mov -hq -acodec mp3 -ar 22050 -ab 32 -f flv -s 320x240 -aspect 4:3 -y hunches_low_bitrate.flv results: ffmpeg version CVS, build 3211266, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-gpl built on Aug 18 2005 14:16:34, gcc: 3.3.3 20040412 (Red Hat Linux 3.3.3-7) Seems that stream 1 comes from film source: 2997.00 (2997/1) -> 10.00 (10/1) Input #0, mov,mp4,m4a,3gp,3g2, from 'hunches_low_bitrate.mov': Duration: 00:05:29.7, start: 0.000000, bitrate: 109 kb/s Stream #0.0: Audio: 0x6134706d, 16000 Hz, mono Stream #0.1: Video: h264, yuv420p, 160x120, 2997.00 fps Output #0, flv, to 'hunches_low_bitrate.flv': Stream #0.0: Video: flv (hq), yuv420p, 320x240, 10.00 fps, q=2-31, 200 kb/s Stream #0.1: Audio: mp3, 22050 Hz, mono, 32 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1 Unsupported codec (id=86018) for input stream #0.0

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DV decoding and encoding
by markrages＠gmail.com 07 Sep '05

07 Sep '05

I am decoding DV frames from a camcorder, than re-encoding them with libavformat. Everythings works OK, but I get this message: [pcm_s16le @ 0x914390]Can't process DV frame #3650. Insufficient video data or severe sync problem. It *always* occurs on frame # 3650. And on frames 7297, 10944, 14592, 18239, 21887, 25534, 29181, 32829, 36476... This is NTSC video with 30000/1001 framerate. The problem also occurs at 30/1 framerate, so I reckon it's not some bizarre drop-frame time code problem. My application is based on output_example.c. But I just call "write_audio_frame" once for each video frame, rather than checking the PTS values. This is because I want the audio to go through, unchanged from the input DV frame to the output DV frame. I'm guessing that the camcorder is not outputting the right amount of audio for libavformat's multiplexer. Doesanyone have ideas for testing this theory? Alternate theories? Regards, Mark markrages at gmail -- You think that it is a secret, but it never has been one. - fortune cookie

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Can I have some help with transcoding please
by hyperbit＠msn.com 06 Sep '05

06 Sep '05

Hi, Im taking an MPEG-2 stream directly from a hardware encoder, and using ffmpeg I am able to decode this and display the resulting bitmaps and store the original encoded stream to disk. The problem is that the stream is full D1 resolution(720x576), and the requirements are to store CIF(384x288) to disk. The way I see it is this: 1) Decode a frame 2) Resample the frame (img_resample) 3) encode the frame 4) Store and repeat 1 This uses up way too much CPU (I am reading 2xD1 streams), the CPU is around 55%. Is there a way to transcode *without* decoding/encoding ? Thanks in advance John _________________________________________________________________ Want to block unwanted pop-ups? Download the free MSN Toolbar now! http://toolbar.msn.co.uk/

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