March 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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Video stream extreamly blocky, API changed between fall 2004 and spring 2005?
by sverker＠abrahamsson.com 12 May '07

12 May '07

Hi, I use mpeg4ip for streaming to mobile phones. It use ffmpeg for encoding mpeg4 to encode a stream which is size 176x144 at 90 kbps. This works fine as long as I use a ffmpeg package from sometime early fall 2004 but somewhere between then and late spring 2005 there was a change in ffmpeg so if I build against a later ffmpeg package I get a video stream which is extreamly blocky with huge pixels. I suspect that some parameter has been added which needs to be initialized, I tried to figure it out by looking at diffs of ffmpeg.c and avcodec.h but haven't found the right one to set. Any help to solve this issue is highly aprechiated, below is the initialization code from mp4live video_ffmpeg.cpp. bool CFfmpegVideoEncoder::Init (void) { avcodec_init(); avcodec_register_all(); if (m_push != NULL) { delete m_push; m_push = NULL; } double rate; rate = TimestampTicks / Profile()->GetFloatValue(CFG_VIDEO_FRAME_RATE); m_frame_time = (Duration)rate; if (strcasecmp(Profile()->GetStringValue(CFG_VIDEO_ENCODING), VIDEO_ENCODING_MPEG4) == 0) { m_push = new CTimestampPush(1); m_codec = avcodec_find_encoder(CODEC_ID_MPEG4); m_media_frame = MPEG4VIDEOFRAME; #ifdef OUTPUT_RAW m_outfile = fopen("raw.m4v", FOPEN_WRITE_BINARY); #endif } else if (strcasecmp(Profile()->GetStringValue(CFG_VIDEO_ENCODING), VIDEO_ENCODING_H263) == 0) { m_push = new CTimestampPush(1); m_codec = avcodec_find_encoder(CODEC_ID_H263); m_media_frame = H263VIDEOFRAME; #ifdef OUTPUT_RAW m_outfile = fopen("raw.263", FOPEN_WRITE_BINARY); #endif } else { m_push = new CTimestampPush(3); m_codec = avcodec_find_encoder(CODEC_ID_MPEG2VIDEO); m_media_frame = MPEG2VIDEOFRAME; #ifdef OUTPUT_RAW m_outfile = fopen("raw.m2v", FOPEN_WRITE_BINARY); #endif } if (m_codec == NULL) { error_message("Couldn't find codec"); return false; } m_avctx = avcodec_alloc_context(); m_picture = avcodec_alloc_frame(); m_avctx->width = Profile()->m_videoWidth; m_avctx->height = Profile()->m_videoHeight; m_avctx->bit_rate = Profile()->GetIntegerValue(CFG_VIDEO_BIT_RATE) * 1000; #ifndef HAVE_AVCODECCONTEXT_TIME_BASE m_avctx->frame_rate = (int)(Profile()->GetFloatValue(CFG_VIDEO_FRAME_RATE) + 0.5); m_avctx->frame_rate_base = 1; #else m_avctx->time_base = (AVRational){1, (int)(Profile()->GetFloatValue(CFG_VIDEO_FRAME_RATE) + .5)}; m_avctx->strict_std_compliance = -1; m_avctx->pix_fmt = PIX_FMT_YUV420P; m_avctx->profile = Profile()->m_videoMpeg4ProfileId; #endif if (Profile()->GetIntegerValue(CFG_VIDEO_MPEG4_PAR_WIDTH) > 0 && Profile()->GetIntegerValue(CFG_VIDEO_MPEG4_PAR_HEIGHT) > 0) { #ifndef HAVE_AVRATIONAL float asp = (float)Profile()->GetIntegerValue(CFG_VIDEO_MPEG4_PAR_WIDTH); asp /= (float)Profile()->GetIntegerValue(CFG_VIDEO_MPEG4_PAR_HEIGHT); m_avctx->aspect_ratio = asp; #else AVRational asp = {Profile()->GetIntegerValue(CFG_VIDEO_MPEG4_PAR_WIDTH), Profile()->GetIntegerValue(CFG_VIDEO_MPEG4_PAR_HEIGHT)}; m_avctx->sample_aspect_ratio = asp; #endif } #if 0 debug_message("ffmpeg %u x %u bit rate %u media %d", Profile()->m_videoWidth, Profile()->m_videoHeight, m_avctx->bit_rate, m_media_frame); #endif m_usingBFrames = false; m_BFrameCount = 0; if (m_media_frame == MPEG2VIDEOFRAME) { m_avctx->gop_size = 15; m_avctx->b_frame_strategy = 0; m_avctx->max_b_frames = 2; m_usingBFrames = true; m_BFrameCount = 2; } else { if (m_media_frame == H263VIDEOFRAME) { m_avctx->bit_rate = Profile()->GetIntegerValue(CFG_VIDEO_BIT_RATE) * 800; m_avctx->bit_rate_tolerance = Profile()->GetIntegerValue(CFG_VIDEO_BIT_RATE) * 200; #if 0 // this makes file writing difficult m_avctx->rtp_mode = true; m_avctx->rtp_payload_size = Profile()->GetIntegerValue(CONFIG_RTP_PAYLOAD_SIZE); #endif } else if (m_media_frame == MPEG4VIDEOFRAME) { if (Profile()->GetBoolValue(CFG_VIDEO_USE_B_FRAMES)) { m_avctx->max_b_frames = Profile()->GetIntegerValue(CFG_VIDEO_NUM_OF_B_FRAMES); m_usingBFrames = true; m_BFrameCount = m_avctx->max_b_frames; } } m_key_frame_count = m_avctx->gop_size = (int) ((Profile()->GetFloatValue(CFG_VIDEO_FRAME_RATE)+0.5) * Profile()->GetFloatValue(CFG_VIDEO_KEY_FRAME_INTERVAL)); m_avctx->flags |= CODEC_FLAG_GLOBAL_HEADER; debug_message("key frame count is %d", m_key_frame_count); } m_count = 0; ffmpeg_interface_lock(); if (avcodec_open(m_avctx, m_codec) < 0) { ffmpeg_interface_unlock(); error_message("Couldn't open codec"); return false; } ffmpeg_interface_unlock(); m_first_frame = true; return true; } /Sverker

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FFMpeg incorrectly parses file with meta data.
by grant＠bluetube.com 26 Apr '07

26 Apr '07

Hi guys, I posted example files a few days ago as Baptiste encouraged me to, and was hoping someone could take a look. links : http://www.bluetube.com//temp/ffmpeg/SD/00519.zip <http://www.bluetube.com//temp/ffmpeg/SD/00519.zip> http://www.bluetube.com//temp/ffmpeg/SD/00520.zip <http://www.bluetube.com//temp/ffmpeg/SD/00520.zip> http://www.bluetube.com//temp/ffmpeg/HD/00517.zip <http://www.bluetube.com//temp/ffmpeg/HD/00517.zip> http://www.bluetube.com//temp/ffmpeg/HD/00518.zip <http://www.bluetube.com//temp/ffmpeg/HD/00518.zip> FFMPEG states these files have mp3 or mp2 audio and it couldn't find the codec but these files do not have that format, its raw pcm audio. the files are from a sony XD cam and are wrapped into quicktimes. The have Camera META data in them. If we take the files and run them through final cut pro and re-save, the camera meta data is removed and ffmpeg correctly processes them. Unfortunately the workflow we have requires us to be able to take the quicktime from the sony transfer program with the camera meta data present and produce thumbnails. sample command line : /Applications/xampp/htdocs/app/bin/ffmpeg -an -i "/Applications/xampp/ htdocs/app/webroot/assets/asset165/wolf00261.mov" -ss 00:00:01 -t 00:00:01 -r 1 -y -s 80x60 "/Applications/xampp/htdoc s/app/webroot/assets/asset165/wolf00261"%d.jpg error : FFmpeg version SVN-r7715, Copyright (c) 2000-2006 Fabrice Bellard, et al. configuration: --enable-mp3lame --enable-static --disable-vhook libavutil version: 49.2.0 libavcodec version: 51.29.0 libavformat version: 51.8.0 built on Jan 25 2007 22:18:56, gcc: 4.0.1 (Apple Computer, Inc. build 5367) [mp3 @ 0x3d2060]Could not find codec parameters (Audio: mp3, 64 kb/s) Cheers, Grant.

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Low quality encoding...
by c00jz3r0＠gmail.com 02 Apr '07

02 Apr '07

Hi there, I'm facing a low quality encoding and I don't know why... So... I have the original frames on BGR24... I want to compress them to send via RTP... I do the following: void video_encode(unsigned char* frame_rgb, int frame_rgb_size, unsigned char* enc_frame, int buf_size, int &enc_frame_size) { int hr; /* Feed uncompressed_frame with the raw RGB data */ AVPicture uncompressed_frame; uncompressed_frame.data[0] = frame_rgb; uncompressed_frame.data[1] = uncompressed_frame.data[2] = 0x00; uncompressed_frame.linesize[0] = 176*3; uncompressed_frame.linesize[1] = uncompressed_frame.linesize[2] = 0; /* Convert from RGB24 to YUV420P */ hr = img_convert((AVPicture*)yuv420_frame, PIX_FMT_YUV420P, &uncompressed_frame, PIX_FMT_BGR24, 176, 144); /* Encode the YUV420P frame to H.263 */ hr = avcodec_encode_video(enc_context, enc_frame, buf_size, yuv420_frame); if (hr>0) { enc_frame_size = hr; } else { enc_frame_size = -1; } } Any ideas on how can I improve the compression quality? Thanks

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Capture and encode problem
by pdo.cloud＠gmail.com 31 Mar '07

31 Mar '07

Hello, I am trying to do real-time capturing and encoding of the TV signal from my cable. I am using tvtime for capturing and ffmpeg for encoding and muxing the output. Below is the captured output of my program. The audio has some noise in there, the video frame flow has some jittering, and audio and video stream are out of sync. <output file> http://www.yousendit.com/download/M3BuUWVzQ1BFd2MwTVE9PQ<javascript:ol('http://www.yousendit.com/download/M3BuUWVzQ1BFd2MwTVE9PQ');> My code looks roughly as followed: 1. Initialization of ffmpeg video and audio stream 2. Start the capturing thread: while (isCapturing) { if (audio_st) { audio_pts = (double)audio_st->pts.val * video_st->time_base.num / \ audio_st->time_base.den; } else { audio_pts = 0; } if (video_st) { video_pts = (double)video_st->pts.val * video_st->time_base.num / \ video_st->time_base.den; } else { video_pts = 0; } if (!video_st || (video_st && audio_st && audio_pts < video_pts)) { write_audio_frame(); } else { write_video_frame(); } } Inside write_video_frame(), I retrieve a video frame from the video buffer, encode, and use av_write_frame to write it to the output file. Inside write_audio_frame(), I call snd_pcm_readi to read an audio frame, encode, and use av_write_frame to write it to the output file. Anything might have gone wrong? Thanks, Phuoc

1 0

From FLV to WMV: output shows bad parts
by koenk＠xs4all.nl 31 Mar '07

31 Mar '07

I'm using the following command to convert FLV to WMV: ffmpeg -y -i ./gta4.flv -vcodec wmv2 -acodec wmav2 -ar 44100 -ab 128k -b 1500k ./test.wmv FFmpeg version SVN-r8551, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-shared --enable-xvid --enable-libvorbis --enable-libogg --enable-libmp3lame --enable-gpl --enable-libfaad --enable-libfaac --enable-liba52 --enable-x264 --enable-amr_nb --enable-pp libavutil version: 49.4.0 libavcodec version: 51.40.2 libavformat version: 51.11.0 built on Mar 30 2007 11:28:36, gcc: 3.3.5 (Debian 1:3.3.5-13) Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 59.94 (60000/1001) Input #0, flv, from './gta4.flv': Duration: 00:01:03.7, start: 0.000000, bitrate: 128 kb/s Stream #0.0: Video: vp6f, yuv420p, 640x360, 59.94 fps(r) Stream #0.1: Audio: mp3, 44100 Hz, stereo, 128 kb/s Output #0, asf, to './test.wmv': Stream #0.0: Video: wmv2, yuv420p, 640x360, q=2-31, 1500 kb/s, 59.94 fps(c) Stream #0.1: Audio: wmav2, 44100 Hz, stereo, 128 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #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= 3821 fps=120 q=2.0 Lsize= 1kB time=63.7 bitrate= 0.1kbits/s video:10683kB audio:996kB global headers:0kB muxing overhead -99.994992% Everything seems to be fine, but when watching the video you see some parts with big blocks for a few seconds. You can watch the video here (at about 23 seconds you see the scrambled bit) : http://217.67.230.176/test.wmv I've seen these blocks before, but in this movie there are just too much of them... What is causing this and more important, how can I fix it? Please note that the output must be WMV format. Thanks

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AACPlus(HE-AAC) or AAC? How do i see?
by krstjern＠animeamanga.com 31 Mar '07

31 Mar '07

Hello, When I use avformat to open a audio file with AACP. It sets the tag to mp4a, or AACP or just 0. Now, as far as I can tell, all the AAC variants use the same Codec ID, is there anny way I can tell if it's normal AAC, or HE-AAC? Thanks in advance =)

1 0

".mov" conversion error
by nicolas＠buf.fr 31 Mar '07

31 Mar '07

Hello, I would like to simply convert from an ".avi" file to a ".mov" file. The input file is "from_jpg.avi" (it has been generated from a jpeg sequence and a wav file with this command : ffmpeg -i foo.%d.jpg -i bar.wav -vcodec mpeg4 -acodec mp3 from_jpg.avi) $ ffmpeg -i from_jpg.avi FFmpeg version SVN-r8540, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-gpl --enable-static --enable-swscaler --enable-pthreads --enable-libmp3lame --enable-libogg --enable-xvid --disable-ffserver --extra-ldflags=-static --enable-memalign-hack libavutil version: 49.4.0 libavcodec version: 51.40.2 libavformat version: 51.11.0 built on Mar 29 2007 11:04:31, gcc: 3.3.1 Input #0, avi, from 'from_jpg.avi': Duration: 00:00:08.5, start: 0.000000, bitrate: 2881 kb/s Stream #0.0: Video: mpeg4, yuv420p, 640x352, 25.00 fps(r) Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s Must supply at least one output file $ ffmpeg -i from_jpg.avi -vcodec copy -acodec copy from_avi.mov ; echo $? FFmpeg version SVN-r8540, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-gpl --enable-static --enable-swscaler --enable-pthreads --enable-libmp3lame --enable-libogg --enable-xvid --disable-ffserver --extra-ldflags=-static --enable-memalign-hack libavutil version: 49.4.0 libavcodec version: 51.40.2 libavformat version: 51.11.0 built on Mar 29 2007 11:04:31, gcc: 3.3.1 Input #0, avi, from 'from_jpg.avi': Duration: 00:00:08.5, start: 0.000000, bitrate: 2881 kb/s Stream #0.0: Video: mpeg4, yuv420p, 640x352, 25.00 fps(r) Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s Output #0, mov, to 'from_avi.mov': Stream #0.0: Video: mpeg4, yuv420p, 640x352, q=2-31, 25.00 fps(c) Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 [mov @ 0x84f4340]track 1: codec frame size is not set Could not write header for output file #0 (incorrect codec parameters ?) 0 Would you know what is wrong ? As nothing seems special in my ffmpeg command line... And, how come it does not return an error code to the shell ? Regards, Nicolas

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Named pipes woes
by hxdg21＠yahoo.com 30 Mar '07

30 Mar '07

Hi, I have to add video recording capabilities to a program that holds /dev/video0 while the record is being taken. The program has to hold the device for several reasons and vloopback is not an option for me since the program is also expected to send commands to the camera. Therefore, I believe the best solution in my case is to use a named pipe to feed ffmpeg with my video data. I am hoping that I will be able to simply write a copy of my yuv420p data into the named pipe while ffmpeg grabs data from /dev/dsp on its own. Does that sound like a good way to solve my problem? Well... I have been playing with ffmpeg and named pipes in the command line without success. I have tried several different versions, codecs, and combinations of command line parameters to no avail. This is what I get with the latest SVN snapshot: This works just fine: ffmpeg -f audio_device -i /dev/dsp -f video4linux -s 320x240 -i /dev/video0 /tmp/out1.mpg However this doesn't: ffmpeg -f audio_device -i /dev/dsp -f rawvideo -s 320x240 -i ./video_fifo /tmp/out2.mpg ... where ./video_fifo is my named pipe and I cat /dev/video0 into it using another shell. The command above produces a out2.mpg video but it looks and sounds like a "fast-forwarded" out1.mpg (i.e., the video frames are displayed really fast in the screen and you can barely make sense of the sound). I suspect that '-f rawvideo' might be contributing to the problem but I couldn't get ffmpeg to accept an input from my named pipe w/o specifying this format. What am I doing wrong? Any help would be greatly appreciated. Best Regards __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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