July 2007 - ffmpeg-user - lists.ffmpeg.org

Frame sizes
by estelasousavieira＠hotmail.com 31 Oct '07

31 Oct '07

I need to obtain the sizes of the I, P and B frames of the video of a DVD. Is this possible with ffmpeg? _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

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VFW Capture support
by ramiro＠lisha.ufsc.br 23 Oct '07

23 Oct '07

Hello, First attempt for VFW capture support in Windows. For testing purposes only! Enable it with: ./configure --enable-memalign-hack --enable-vfw-cap It prints lots of (somewhat useless) debug messages. Image is upside down =). I just have to find the right PIX_FMT and width/height... I'm way too tired to look at that now. Note: Run this FFmpeg from Windows' command prompts (cmd or command)! *Not MSys!*. This patch includes the patch I sent to ffmpeg-devel for interactive support for Windows. You must kill it with 'q' or Ctrl+C, or else the capture device won't be released, and you'll have to reboot Windows to get it back. MSys doesn't capture 'q' nor Ctrl+C, so it's doomed to make you loose control of the device. Ramiro Polla

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Problem building ffmpeg in MingW
by 10walls＠gmail.com 14 Oct '07

14 Oct '07

Hi, not strictly a question but here goes. I had problems building ffmpeg from the svn checkouts without some modifications. First of all the configure script fails the libx264 detection. My x264 install is built with pthreads. The configure script fails to test libx264 with gcc -o /tmp/ffmpeg-conf-13885-2672-28731 /tmp/ffmpeg-conf-21387-2672-28548.o -lm -lz -lpthread -lx264 .... undefined reference to `_imp__pthread_join' .... undefined reference to `_imp__pthread_create' .... undefined reference to `_imp__pthread_num_processors_np' .... undefined reference to `_imp__pthread_mutex_lock' .... undefined reference to `_imp__pthread_mutex_unlock' .... etc, error messages about undefined reference to pthread functions. Modifying configure at line 1576 and adding -lpthread AFTER -lx264 works. The new test would pass "-lm -lz -lpthread -lx264 -lpthread" to gcc. What is going on? Also libavformat/vocenc.c would fail to compile. `ENOTSUP' undeclared (first use in this function). Adding #define ENOTSUP 48 would fix it. ENOTSUP is also defined in pthread.h. Will anybody be fixing it?

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Encoding grey pattern to WMV causes green square artefacts in Windows Media Player
by vanista＠gmail.com 31 Aug '07

31 Aug '07

Uploaded files to : ftp://upload.mplayerhq.hu/MPlayer/incoming/wmv_green_squares_wmp Subject : Transcoding grey static video to WMV causes green square artefacts in Windows Media Player I transcoded a simple GIF animation to WMV. Part of the picture displayed as green square artefacts during playback in Windows Media Player. I've extracted and expanded this part of the picture. It features grey pixels with somewhat high frequencies (noise). This new samples easily produces the problem in WMP. The same output is decoded fine with libavcodec and all players using it. Using Windows Media Encoder on the same input doesn't produce the problem. I also figured that filtering out the high frequencies would fix the problem. For example, using GStreamer's postproc_lowpass5 filter with scope=2 quality=0. ffmpeg -i grey.avi -vcodec wmv2 ffout.wmv FFmpeg version SVN-r9376, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --prefix=/opt/sherdev/MPlayer/1.0rc1 --enable-gpl --disable-strip --disable-mmx libavutil version: 49.4.0 libavcodec version: 51.40.4 libavformat version: 51.12.1 built on Jun 20 2007 14:58:35, gcc: 3.4.6 Input #0, avi, from 'grey.avi': Duration: 00:00:02.0, start: 0.000000, bitrate: 93 kb/s Stream #0.0: Video: rawvideo, yuv420p, 96x80, 1.00 fps(r) Output #0, asf, to 'ffout.wmv': Stream #0.0: Video: wmv2, yuv420p, 96x80, q=2-31, 200 kb/s, 1.00 fps(c) Stream mapping: Stream #0.0 -> #0.0 Compiler did not align stack variables. Libavcodec has been miscompiled and may be very slow or crash. This is not a bug in libavcodec, but in the compiler. Do not report crashes to FFmpeg developers. Press [q] to stop encoding frame= 2 fps= 0 q=2.0 Lsize= 4kB time=2.0 bitrate= 14.5kbits/s video:2kB audio:0kB global headers:0kB muxing overhead 120.742092% Note, for some reason, the output by ffmpeg doesn't play as is in WMP, I had to remux it by fixing timestamps using GStreamer. I provided both outputs for analysis. In either case, the container isn't the issue, it realy is the encoded stream. Files : grey.avi : the input sample ffout.wmv : the output from ffmpeg (doesn't play in WMP) greyout.wmv : passthrough remuxed output (plays in WMP) wmp_ss.jpg : screen shot of Windows Media Player depicting the problem report.txt : this bug report The remuxed output is produced using this pipeline : gst-launch-0.10 \ filesrc location=ffout.wmv ! \ asfdemux ! \ asfmux force-duration=10000 input-video-buffer-duration=2000 ! \ filesink location=greyout.wmv

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Licensing requirements for 3GP, H263, WMV etc
by sbarriba＠yahoo.co.uk 20 Aug '07

20 Aug '07

Hi all, We are evaluating ffmpeg for use within a commercial application, and I'm therefore trying to determine the licensing requirements to ensure legal usage of ffmpeg for our purposes. I've located licensing information for: . Mpeg4 via mpegla . AMR via Voiceage . AAC via Via Licensing Any guidance/experiences on the licensing requirements for the following would be appreciated: . H263 . 3GPP container . 3GPP 2 container . WMV . Quicktime MOV (decode only) . MP3 audio . WAV audio Regards, Shaun.

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Build ffmpeg with external library support using mingw32
by spendino＠cantoche.com 16 Aug '07

16 Aug '07

Hello everybody. As far as I know ffmpeg, amr support has recently changed - this codec is now compiled as an external library-. I'd like to build ffmpeg with libamr-nb enabled and I experience troubles. Here is what I get : $ ./configure --enable-memalign-hack --enable-libamr-nb ERROR: libamrnb not found If you think configure made a mistake, make sure you are using the latest version from SVN. If the latest version fails, report the problem to the ffmpeg-devel at mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.err" produced by configure as this will help solving the problem. And here is my config.err check_lib zlib.h zlibVersion -lz check_header zlib.h check_cpp BEGIN /tmp/ffmpeg-conf-8495-1348-20764.c 1 #include <zlib.h> 2 int x; END /tmp/ffmpeg-conf-8495-1348-20764.c gcc -fomit-frame-pointer -E -o /tmp/ffmpeg-conf-23568-1348-24308.o /tmp/ffmpeg-conf-8495-1348-20764.c C:/DOCUME~1/Sylvain/LOCALS~1/Temp/ffmpeg-conf-8495-1348-20764.c:1:18: zlib.h: No such file or directory check_lib amrnb/interf_dec.h Speech_Decode_Frame_init -lamrnb -lm check_header amrnb/interf_dec.h check_cpp BEGIN /tmp/ffmpeg-conf-8495-1348-20764.c 1 #include <amrnb/interf_dec.h> 2 int x; END /tmp/ffmpeg-conf-8495-1348-20764.c gcc -fomit-frame-pointer -E -o /tmp/ffmpeg-conf-23568-1348-24308.o /tmp/ffmpeg-conf-8495-1348-20764.c C:/DOCUME~1/Sylvain/LOCALS~1/Temp/ffmpeg-conf-8495-1348-20764.c:1:30: amrnb/interf_dec.h: No such file or directory ERROR: libamrnb not found Please note that I am using : - mingw32 - libamrnb 6.1.0.3 - FFmpeg version SVN-r9197 ( libavutil version: 49.4.0 libavcodec version: 51.40.4 libavformat version: 51.12.1 ) However, both the zlib and the libamrnb are installed (they are located in /usr/local). Does someone know why these libs cannot be found ? Thanks in advance Sylvain

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avid mxf file
by lx＠survive-linux.com 11 Aug '07

11 Aug '07

Hello everybody, i hope i am not bothering on such a nice warm day, I am searching for a solution for my ffmpeg problem, which is basiclly, that i cannot convert an avid mxf file to another format. The process just dies with "no stream output"... Is there anyone who can enlighten me? Help really appreciated!!! Regards, Alex

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Decompressing a stream (single frame)
by mathieu.malaterre＠gmail.com 09 Aug '07

09 Aug '07

Hello, I am attempting to decompress a file that has been compressed with 'loco'. Here is what I have been trying to run: $ ./ffmpeg -f image2 -vcodec loco -i /tmp/raw.loco Unfortunately it does not work. Could someone please let me know how do I specify that there is not file format (raw stream) and that the stream is compressed using loco. Thanks -- Mathieu

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Converting Image file to video
by wolf＠wolffebrothers.com 07 Aug '07

07 Aug '07

Hello, I'm trying to convert one image to a mov video file that lasts 4 seconds. I have done the following ffmpeg -r 1 -vframes 4 -i Picture.jpg -i Picture.jpg -i Picture.jpg -i Picture.jpg -s 400x300 test.mov The video that is created only lasts one second. Can anybody help me here. Thanks, Josh

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Recover Audio/Video sync after corruption in Video Stream
by jaelwood＠gmail.com 07 Aug '07

07 Aug '07

Sometimes I encounter a MPG file with corruption in the Video stream. The example below is uploaded to ftp://upload.mplayerhq.hu/MPlayer/incoming/Ugly Betty_WPTA-DT_01_02_2007_19_56_07.mpg The problem is once either ffmpeg or ffplay encounter this corruption the Audio and Video never sync up again. I can play this file with Windows Media Player, MPlayer, or use Mencoder to convert the file and they will automatically re-sync the audio and video. Is there a special switch I need to use with ffmpeg or ffplay to cause the re-sync to happen? Below is the output of ffmpeg. C:\Users\jon\Desktop\MPlayer>"ffmpeg" -benchmark -y -i "Ugly Betty_WPTA-DT_01_02 _2007_19_56_07.mpg" -deinterlace -vcodec mpeg4 -qscale 4 -vtag DX50 -acodec libm p3lame -ac 2 -ab 128000 -f avi "Ugly Betty_WPTA-DT_01_02_2007_19_56_07.avi" FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-static --enable-memalign-hack --enable-libmp3lame --en able-libxvid --enable-gpl --enable-libfaad --enable-libfaac --enable-libx264 --e nable-pthreads --enable-liba52 --disable-ffplay --enable-swscaler libavutil version: 49.4.1 libavcodec version: 51.40.4 libavformat version: 51.12.1 built on Jul 28 2007 09:23:20, gcc: 4.2.1 Input #0, mpeg, from 'Ugly Betty_WPTA-DT_01_02_2007_19_56_07.mpg': Duration: 00:00:32.3, start: 0.500000, bitrate: 13834 kb/s Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 1280x720, 13430 kb/s, 59.94 fp s(r) Stream #0.1[0x80]: Audio: liba52, 48000 Hz, stereo, 384 kb/s Output #0, avi, to 'Ugly Betty_WPTA-DT_01_02_2007_19_56_07.avi': Stream #0.0: Video: mpeg4, yuv420p, 1280x720, q=2-31, 200 kb/s, 59.94 fps(c) Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, 128 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 No accelerated IMDCT transform found Press [q] to stop encoding [mpeg2video @ 00884A20]ac-tex damaged at 36 18=11.4 bitrate=6963.9kbits/s [mpeg2video @ 00884A20]Warning MVs not available [mpeg2video @ 00884A20]concealing 2160 DC, 2160 AC, 2160 MV errors [mpeg2video @ 00884A20]ac-tex damaged at 49 44=31.2 bitrate=6674.1kbits/s [mpeg2video @ 00884A20]Warning MVs not available [mpeg2video @ 00884A20]concealing 80 DC, 80 AC, 80 MV errors frame= 1941 fps= 52 q=4.0 Lsize= 25831kB time=31.4 bitrate=6745.9kbits/s video:24889kB audio:490kB global headers:0kB muxing overhead 1.778629% bench: utime=34.367s Thank you.

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