July 2008 - ffmpeg-user - lists.ffmpeg.org

axis mpeg4 stream w/ aac audio
by danielp＠choma.hu 30 May '14

30 May '14

Hello, i've an Axis 247s video server which provides mpeg4 stream w/ aac audio, and i would like to get an flv stream from this. i've compiled ffmpeg/ffserver with --enable-libmp3lame --enable- shared --enable-libamr-nb --enable-nonfree --enable-gpl --enable- libfaad --enable-libfaac i can get the stream work with ffserver without audio, but not with audio. my ffserver.conf: Port 8090 BindAddress 0.0.0.0 MaxClients 1000 MaxBandwidth 1000 CustomLog - NoDaemon <Feed feed1.ffm> File /tmp/feed1.ffm FileMaxSize 1G ACL allow 127.0.0.1 </Feed> <Stream test.flv> # the source feed Feed feed1.ffm # the output stream format - FLV = FLash Video Format flv VideoCodec flv # this must match the ffmpeg -r argument VideoFrameRate 25 # generally leave this is a large number VideoBufferSize 80000 # another quality tweak VideoBitRate 500 # quality ranges - 1-31 (1 = best, 31 = worst) VideoQMin 1 VideoQMax 5 VideoSize 640x480 # this sets how many seconds in past to start PreRoll 0 AudioBitRate 64 AudioChannels 1 AudioSampleRate 44100 AudioCodec mp3 </Stream> i've tried several things like: openRTSP -b 80000 -y -c -4 -f 25 -w 640 -h 480 -t rtsp://xxx.hu:554/mpeg4/1/media.amp | \ ffmpeg -v 9 -vcodec mpeg4 -acodec mpeg4aac -ab 32k -i - -acodec libmp3lame -ar 44100 -ab 64k -ac 1 -vcodec mpeg4 http://localhost:8090/ or: mencoder \ -rtsp-stream-over-tcp rtsp://xxx.hu:554/mpeg4/1/media.amp \ -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 \ -oac mp3lame -lameopts abr:br=64:q=1:mode=3 \ -o - | \ ffmpeg \ -ab 32 -acodec mp3 -ar 44100 -ac 1 -f mpeg -r 25 -i - \ -r 25 -ab 32 -acodec mp3 -ar 44100 -ac 1 http://localhost:8090/ and tons of switches, but nothing worked. can you please help me somehow? thx, -- dp

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.m4a to .flv - image/video fails
by nreddig＠ptd.net 31 Mar '12

31 Mar '12

Hi all, I have greatly appreciated the information I have already gleaned from reading this forum. However I still can not solve my current problem. I am trying to convert from .m4a to .flv. These are podcast files (.m4a) built in garage band. Pictures were added as well and we would like to use this format to create weekly announcements because Garage Band is so easy for our non-technically oriented staff. Using ffmpeg the audio converts just fine but the "video" is not right. I guess it's because these files include chapter data not actual video. However when I convert it to any format the images fly through at different rates, then it seems to get stuck on a picture in the middle. The format I would like to convert to is flash so that I can easy display multiple announcement files using a flash player. I can convert .mov to .flv no problem. Converting .m4a to .mov and then .flv doesn't produce any better results. Here are the before and after files: http://www.warwicksd.org/warwick.m4a http://www.warwicksd.org/output.flv I used the following to get my conversion: ffmpeg -i warwick.m4a -b 300k -r 12 -s 300x300 -ar 22050 -y -ab 96k output.flv FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-gpl --enable-libfaac --enable-libfaad --enable- libmp3lame --disable-vhook --enable-shared libavutil version: 49.5.0 libavcodec version: 51.44.0 libavformat version: 51.14.0 built on Oct 22 2007 15:31:25, gcc: 3.3 20030304 (Apple Computer, Inc. build 1640) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'warwick.m4a': Duration: 00:00:55.9, start: 0.000000, bitrate: 100 kb/s Stream #0.0(eng): Audio: mpeg4aac, 44100 Hz, stereo Stream #0.1(eng): Video: mjpeg, yuvj420p, 300x300, 44100.00 fps(r) Stream #0.2(eng): Data: tx3g / 0x67337874 Stream #0.3(eng): Data: text / 0x74786574 Output #0, flv, to 'output.flv': Stream #0.0(eng): Video: flv, yuv420p, 300x300, q=2-31, 300 kb/s, 12.00 fps (c) Stream #0.1(eng): Audio: libmp3lame, 22050 Hz, stereo, 96 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1 Press [q] to stop encoding frame= 83 fps= 21 q=2.0 Lsize= 1099kB time=6.9 bitrate=1301.6kbits/s video:70kB audio:657kB global headers:0kB muxing overhead 51.296550% .mov files convert nicely to .flv but these .m4as are just not working. Our current staff is very eager to use these Garage Band files to communicate announcements. I have been so desperate to get this particular file type to convert that I have been experimenting with grabbing the frames every 5 secs. and then rebuilding the images into video. This produces strange results and seems to be more programming then should be necessary. Thanks in advanced for any solutions you can provide. Nancy Reddig Web Programmer Warwick SD

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video4linux2 - NTSC webcam
by knox1808＠yahoo.com 29 Jan '10

29 Jan '10

I'm hoping someone can lead me in the right direction.? I've upgraded my OLD debian to ubuntu and noticed my old-fashioned way of capturing video from my webcam doesn't work anymore.? I used to be able to call ffmpeg with: ffmpeg -vd /dev/video0 -s 320x240 test.flv I noticed that ffmpeg now requires: ffmpeg -f video4linux2 -i /dev/video0 However, I am getting errors about incorrect parameters with the following: ffmpeg -f video4linux2 -i /dev/video0 -s 320x240 -an test.flv FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al. ? configuration: --enable-gpl --enable-pp --enable-swscaler --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg --enable-libgsm --enable-dc1394 --disable-debug --enable-shared --prefix=/usr ? libavutil version: 1d.49.3.0 ? libavcodec version: 1d.51.38.0 ? libavformat version: 1d.51.10.0 ? built on Mar 12 2008 14:31:53, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu4) [video4linux2 @ 0xb7fc7110]Missing/Wrong parameters /dev/video0: Error while opening file I've changed permissions to /dev/video0 with chmod g+rw /dev/video0 since I had issues like that in the past. I must be missing some newly-required parameters?? In a more recent SVN (June 22nd), I got a similar error, but it had text more like "Incorrect width, height, or rate". Any help is appreciated.

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Compiling ffmpeg with extra libs without root access
by jakobdj＠gmail.com 15 Apr '09

15 Apr '09

Hi I am trying to compile ffmpeg but I don't have root privilige on the machine. I've compiled using --prefix when configuring - but the problem is that I need to use lameMp3 encoder and libamr-wb and libamr- nb. These I have installed and placed in my home dir - but how do I make sure that ffmpeg looks there when compiling. This is my problem - how do I tell ffmpeg explicitly where to look for extra libs? Kind regards, Jakob Dam Jensen

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resize and imlib2 vhook in one command ?
by code＠u-turnmedia.com 02 Oct '08

02 Oct '08

hi, i would like to resize video and overlay with image. when i resize video, e.g. from 624x352 to 320x240, and use imlib2 vhook in one line, i get 320x240 video with small picture in the corner: ffmpeg -i infile.avi -cropright 52 -cropleft 52 -s 320x240 -aspect 1.333 -vhook './imlib2.so -x 0 -y 0 -i image.png' outfile.avi i know that options for imlib2 are -x -y for coordinates, and i would like to know how to use """ Expressions are functions of these variables: N frame number (starting at zero) H frame height W frame width h image height w image width X previous x coordinate of text or image Y previous y coordinate of text or image """ precisely, how do i tell to the image to keep the same size ? do i have to use two commands ? like in first command resize video, and in second use vhook ? thanks Co.De. --

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Using libavcodec in VC++ 6.0
by ajm2707＠yahoo.com 12 Aug '08

12 Aug '08

I wanted to use libavcodec libarary to decode MPEG4-Part2 data or MPEG4/AVC (H.264) data that I receive from Darwin Streaming Server 5.5.5. I am using libavcode libarary and I used code from http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/apiexample_8c-source.html ==> (video_decode_example). I have MPEG4-Part2 data, but it (code from above site) fails - give access violation. I have H.264 data packets, I send it to libavcodec, but it always return false - meaning no frame decoded. I am using VC++6.0 development environment. Does anyone have anything which lead me to further in decoing video data using libavcode.

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Temporal Resampling
by drq2u＠yahoo.com 04 Aug '08

04 Aug '08

Here are some example command lines using video.flv with a native frame rate of 25 fps as input: ffmpeg -i video.flv -vframes 30 -vcodec png norm%06d.png yields the first 30 frames of the video in numbered png files. ffmpeg -i video.flv -r 8.333333 -vframes 30 -vcodec png samp%06d.png yields 30 frames of the video in numbered png files. This should output every 3rd frame of the video (1,4,7,10,13,...); however, comparing files shows that: samp000001.png = norm000001.png samp000002.png = norm000002.png samp000003.png = norm000004.png samp000004.png = norm000007.png ... I have also tested this on 59.94fps videos resampling at 19.98 fps (every 3rd frame) and 9.99fps (every 6th frame) and in all cases, I get the 2nd frame of the video in addition to the expected output. Thanks for your help, Jim Q.

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Format option
by finaly_sav＠hotmail.com 02 Aug '08

02 Aug '08

Hello, What does mean the letter DEVSD int front of codec format when we type the command line ffmpeg -formats ?? Thx. _________________________________________________________________ Retouchez, classez et partagez vos photos gratuitement avec le logiciel Galerie de Photos ! http://www.windowslive.fr/galerie/

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Weezo - new project using Ffmpeg...
by contact＠weezo.net 02 Aug '08

02 Aug '08

Hi all I would just like to inform you of Weezo, a new (well, almost new...) project using FFmpeg. (Weezo is a free remote access / file sharing free software mainly based on Apache/PHP - http://www.weezo.net) Weezo relies on FFmpeg for video (real-time flash reencoding) and audio (bitrate downsampling) streaming. FFmpeg is also used for video reencoding to Apple's iPod/iPhone format. So I would like to thanks all the FFmpeg developers community for the great tool FFmpeg is ! And by the way if anyone like Weezo project, any help would be greatly appreciated (windows compilation, flash encoding optimization, QuickTime encoding...), Nicolas Bruley, main Weezo developer.

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Stopping fffmeg after generating 10 png images from a video file
by kolatmp＠gmail.com 02 Aug '08

02 Aug '08

I want to get 10 snapshots (in .png format) of a video starting at 15 seconds with each snapshot spaced apart by 5 seconds. Is there a simple way to accomplish this using ffmpeg ? I know that there is a way to take a single snapshot and hence I can accomplish this by calling ffmpeg multiple times. (e.g. ffmpeg -i http://mywebserver.com/test.mpg -ss 15 -an -f image2 test.png ) But, I do not want to call ffmpeg multiple times because the video is located on a http server and I want to make only a single connection per video. The video is long and hence downloading the whole video locally is not feasible. Thanks, George

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