August 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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ENCODED videos (any codec) show a still frame the first 4 seconds, then they start...
by henrik.garbergs＠gmail.com 24 Sep '07

24 Sep '07

References=24e094360708152019j163a2f27t74a4fe255117efed at mail.gmail.com In-Reply-To=24e094360708152019j163a2f27t74a4fe255117efed at mail.gmail.com On 2007-08-16 03:19, Jesus Altuve wrote: > I'm noticing in ALL my encoded videos No matter what output vcodec (tried > flv and wmv2), display a still frame of the FIRST frame of the video for the > first 3-5 second, however, sound starts right away with no delay. > > Now, the strange thing is that if I try encoding with the -ss switch and I > advance, say, 5 seconds, then everything works perfectly fine... it seems to > me the encoding is starting, waiting for some data the decoding is not > providing.. maybe an empty or small buffer somewhere? > > I tried several videos (and formats) same thing happens... even with tiny > 3g2 videos.... really, I do think the encoder process is starting way ahead > of the encoding and somehow, *it thinks* its receiving video when it's > actually not. > > Here's the command line i'm using: > ========================= > ffmpeg -y -ss 0 -i input.wmv -acodec libmp3lame -ab 32k -ar 22050 -vcodec > flv -s 320x240 -b 224k -r 25 output.flv > > FFMpeg version and configure options: > =========================== > FFmpeg version SVN-r10065, Copyright (c) 2000-2007 Fabrice Bellard, et al. > configuration: --enable-gpl --enable-libmp3lame --enable-libvorbis > --enable-libogg --enable-libfaac --enable-libfaad --enable-liba52 > --enable-libamr-nb --enable-libamr-wb --disable-debug --disable-ffserver > --disable-ffplay --enable-memalign-hack --enable-libx264 > libavutil version: 49.4.1 > libavcodec version: 51.40.4 > libavformat version: 51.12.1 > built on Aug 15 2007 20:35:46, gcc: 3.4.6 20060404 (Red Hat 3.4.6-3) > > Sample output: > ========== > Seems stream 1 codec frame rate differs from container frame rate: > 1000.00(1000/1) -> > 29.97 (30000/1001) > Input #0, asf, from 'input.wmv': > Duration: 00:00:50.6, start: 0.000000, bitrate: 314 kb/s > Stream #0.0: Audio: wmav2, 44100 Hz, stereo, 64 kb/s > Stream #0.1: Video: wmv3, yuv420p, 448x344, 250 kb/s, 29.97 fps(r) > Output #0, flv, to 'output.flv': > Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 224 kb/s, 25.00fps(c) > Stream #0.1: Audio: libmp3lame, 22050 Hz, stereo, 32 kb/s > Stream mapping: > Stream #0.1 -> #0.0 > Stream #0.0 -> #0.1 > Press [q] to stop encoding > 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. > frame= 1319 fps= 98 q=13.2 Lsize= 1929kB time=47.9 bitrate= 330.2kbits /s > > video:1473kB audio:187kB global headers:0kB muxing overhead 16.193310 > > Thanks, > Hi! I had the same problem, but solved it by reverting to ffmpeg revision 9831: svn checkout -r 9831 svn://svn.mplayerhq.hu/ffmpeg/trunk /usr/src/ffmpeg cd /usr/src/ffmpeg ./configure --enable-gpl --enable-pp --enable-libfaad --enable-libvorbis --enable-libogg --enable-liba52 --enable-dc1394 --enable-libgsm --enable-libmp3lame --enable-libfaac --enable-libxvid --enable-pthreads --enable-libx264 make make install (btw, sorry if this reply didn't match all reference numbers. I used "Gmail Notifier" to capture the reply mailto-link) Best regards /Henrik

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avcodec_open and changing the encoding framerate
by jcharmant＠gmail.com 16 Sep '07

16 Sep '07

Hi, I'm using the lib in a project and at some point I need to transcode a video from a format/codec to another. My problem lies at the encoding stage. Following the example source provided in the source, I can encode to CODEC_ID_MPEG2VIDEO using time base of 25/1. However, as soon as I step aside from that, avcodec_open() fails. using a time base of 10/1 or 40/1 for exemple, raises -1. using CODEC_ID_MJPEG, even at 25/1, raises -1. Here is the relevant piece of code I use. Maybe I'm not setting the AVCodecContext properly ? Maybe I need to put some infos into an AVFormatContext as well ? What is stumping me is why would it work at 25/1 and not at other framerates... Any pointers would be appreciated, thanks. joan. code snippet follows ------------------------------ AVCodec* pOutputCodec; AVCodecContext* pOutputCodecContext = NULL; pOutputCodec = avcodec_find_encoder(CODEC_ID_MPEG2VIDEO); if (!pOutputCodec) break; pOutputCodecContext = avcodec_alloc_context(); // Are the following 3 needed at all ? pOutputCodecContext->codec_id = CODEC_ID_MPEG2VIDEO; pOutputCodecContext->codec_type = CODEC_TYPE_VIDEO; pOutputCodecContext->codec = pOutputCodec; pOutputCodecContext->bit_rate = 400000; pOutputCodecContext->width = 352; pOutputCodecContext->height = 288; pOutputCodecContext->time_base.den = 10; pOutputCodecContext->time_base.num = 1; pOutputCodecContext->gop_size = 0; pOutputCodecContext->max_b_frames = 1; pOutputCodecContext->pix_fmt = PIX_FMT_YUV420P; // Other infos needed ? if (avcodec_open(pOutputCodecContext, pOutputCodec) < 0) break; // Gets here. (...) joan.

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optimal encoding parameters for MPEG-2?
by Noam.Cohen＠harmonicinc.com 15 Sep '07

15 Sep '07

Hi I want to compare the video quality of several software MPEG encoders. Each of the encoders receives the same stream (a decoded MPEG stream at 8Mb/s) and creates an output file. The encoding is done in offline. Output should be CBR, 3Mbs, interlaced NTSC (both input and output). In essence, the ffmpeg should work as transrater - keeping the same resolution and format. I was looking at the command line options, but the documentation is not so easy to understand. Is there a recommended set of options/flags for highest video quality (at the price of higher cpu usage)? Can you recommend (or say which options should not be used?) PS: Is there a search engine for the mailing list? I tried googling it with "site:" but the results were disappointing. Thanks Noam.

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FFMPEG Watermark Help
by mcsddotnetpro＠gmail.com 05 Sep '07

05 Sep '07

Hi there...this is mak from India and i am a software developer by profession. I use the ffmpeg.exe(size 6.5mb) to convert videos to FLV. I'm developing a web application using asp.net . I would like to get some help using this ffmpeg to create watermarks and attach it to the FLV videos. I hope u can guide me or help me.... Thanks Cheers

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converting camstudio with color problems
by ffmpeg＠futourist.hu 03 Sep '07

03 Sep '07

Dear ffmpeg experts, I have a screencapture video with camstudio losless codec and I'd like to convert to flv (or any other videoformat compatible with flash video encoder). The result in all cases is the same: the colors are off a little bit. I tried flv and flashsv codec also. The output: ffmpeg -i colors.avi -vcodec flashsv colors_mod2.flv Seems stream 0 codec frame rate differs from container frame rate: 200.00 (200/1 ) -> 58.00 (58/1) Input #0, avi, from 'colors.avi': Duration: 00:00:01.8, start: 0.000000, bitrate: 2729 kb/s Stream #0.0: Video: camstudio, rgb555, 710x228, 58.00 fps(r) Stream #0.1: Audio: pcm_s16le, 44100 Hz, stereo, 1411 kb/s File 'colors_mod2.flv' already exists. Overwrite ? [y/N] y Output #0, flv, to 'colors_mod2.flv': Stream #0.0: Video: flashsv, bgr24, 710x228, q=2-31, 200 kb/s, 58.00 fps(c) Stream #0.1: Audio: libmp3lame, 44100 Hz, stereo, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press [q] to stop encoding frame= 109 fps= 52 q=0.0 Lsize= 508kB time=1.9 bitrate=2215.3kbits/s video:490kB audio:15kB global headers:0kB muxing overhead 0.612583% This shows the difference: http://futourist.hu/colors.jpg This is the SVN-r9767 version under windows. Is there any solution for this color problem? thank you in advance -- Tam?s Mak? http://futourist.hu/tom/ Choose your future. Choose Python.

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.mov -> .flv
by inikolovbg＠gmail.com 31 Aug '07

31 Aug '07

Hello, I'm trying to convert .mov file to .flv. 1. First try: I execute: ffmpeg -i 1.mov 1.flv Result: FFmpeg version SVN-r10270, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-memalign-hack --enable-libmp3lame --enable-gpl --enable-shared --enable-swscaler --enable-libxvid --enable-libogg --enable-libvorbis --enable-libtheora libavutil version: 49.5.0 libavcodec version: 51.42.0 libavformat version: 51.12.2 built on Aug 31 2007 03:18:21, gcc: 4.1.3 20070812 (prerelease) (Debian 4.1.2-15) [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb7f80f00]negative ctts, ignoring Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mov': Duration: 00:01:34.1, start: 0.000000, bitrate: 10471 kb/s Stream #0.0(eng): Video: h264, yuv420p, 1920x816, 23.98 fps(r) Stream #0.1(eng): Audio: mp4a / 0x6134706D, 48000 Hz, 5:1 Stream #0.2(eng): Data: tmcd / 0x64636D74 Output #0, flv, to '1.flv': Stream #0.0(eng): Video: flv, yuv420p, 1920x816, q=2-31, 200 kb/s, 23.98 fps(c) Stream #0.1(eng): Audio: libmp3lame, 48000 Hz, 5:1, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height 2. Second try I execute: ffmpeg -i 1.mov -f flv -ar 44100 1.flv Result: FFmpeg version SVN-r10270, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-memalign-hack --enable-libmp3lame --enable-gpl --enable-shared --enable-swscaler --enable-libxvid --enable-libogg --enable-libvorbis --enable-libtheora libavutil version: 49.5.0 libavcodec version: 51.42.0 libavformat version: 51.12.2 built on Aug 31 2007 03:18:21, gcc: 4.1.3 20070812 (prerelease) (Debian 4.1.2-15) [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb7f66f00]negative ctts, ignoring Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mov': Duration: 00:01:34.1, start: 0.000000, bitrate: 10471 kb/s Stream #0.0(eng): Video: h264, yuv420p, 1920x816, 23.98 fps(r) Stream #0.1(eng): Audio: mp4a / 0x6134706D, 48000 Hz, 5:1 Stream #0.2(eng): Data: tmcd / 0x64636D74 File '1.flv' already exists. Overwrite ? [y/N] y Resampling with input channels greater than 2 unsupported.Can't resample. Aborting. Aborted I am newbie with ffmpeg. I'm looking forward for your help. Thanks in advance and regards, -- Ivan Nikolov

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WMV to FLV video/audio desynchronisation
by olivier.mailing＠gmail.com 31 Aug '07

31 Aug '07

Hi, I'm actually trying to encode wmv videos to flv format. The sound is delayed by about 2 or 3 seconds (sound in advance of three seconds on start, and no sound at the end). ffmpeg -i myfile.avi -y -r 15 -s 320x240 -ar 22050 -acodec libmp3lame -ab 32000 -ac 1 -bt 64000 -vcodec flv -b 400000 myoutput.flv FFmpeg version SVN-r10260, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-libmp3lame --enable-libxvid --enable-shared --enable-gpl --enable-libamr-nb --enable-libfaad --enable-libfaac --enable-libx264 --enable-libfaac libavutil version: 49.5.0 libavcodec version: 51.42.0 libavformat version: 51.12.2 built on Aug 30 2007 14:14:25, gcc: 4.1.1 20070105 (Red Hat 4.1.1-51) Seems stream 1 codec frame rate differs from container frame rate: 1000.00(1000/1) -> 25.00 (25/1) Input #0, asf, from 'myfile.avi': Duration: N/A, bitrate: 221 kb/s Stream #0.0: Audio: wmav2, 32000 Hz, stereo, 32 kb/s Stream #0.1: Video: wmv1, yuv420p, 320x240, 189 kb/s, 25.00 fps(r) Output #0, flv, to 'myoutput.flv': Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 400 kb/s, 15.00 fps(c) Stream #0.1: Audio: libmp3lame, 22050 Hz, mono, 32 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1 [...] video:1728kB audio:133kB global headers:0kB muxing overhead 4.699934% What can I do to avoid this ? Is this a "bug" ? an error in the input wmv ? I tried with differents wmvs, problem is the same, and delays seems to be equal. The original wmv can be found here : http://dl.free.fr/c7sZP9qSa/F954806Ed01.wmv (986KB) Any feedback welcome :)

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