September 2008 - ffmpeg-user - lists.ffmpeg.org

[Ffmpeg-user] Conversion to flv - lower quality, larger file size
by yegor＠omfgmedia.com 03 Oct '08

03 Oct '08

Ive been playing around with ffmpeg for video conversions for my new site, but Ive been plagued by crappy quality videos, that look very pixelated after the conversion. I noticed on youtube/pornhub/whatever, even if the video isnt the greatest quality, its kinda blurry, but I''m just getting huge pixels, which looks terrible. This is my conversion command: /usr/bin/ffmpeg -i $input_file -ar 44100 -ab 64 -b 500000 -s 520x390 -f flv $output_file_unkeyed I input a 80mb wmv file that looks pretty good, and I get a 110mb flv file that looks much worse (when there is lots of movement especially). Can anyone suggest how I can improve it? -- View this message in context: http://www.nabble.com/Conversion-to-flv---lower-quality%2C-larger-file-size… Sent from the FFmpeg-users mailing list archive at Nabble.com.

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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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Rate control with libx264 not working for me. Rats!
by rpeck＠rpeck.com 02 Oct '08

02 Oct '08

Hey folks! I have a version of ffmpeg and libx264 both built from today's sources. No matter whether I use -b/-bt or -crf or -cqp none of them change the bit rate very much. I expected, say, -b 1000k -bt 100k to end up somewhere between 900kb/s and 1100kb/s, but no matter what I do I'm always getting around 1500kb/s with my test case. Same thing if I use -crf instead and vary it from 16 to 36. . . Following is my command line. Hopefully I'm just missing something stoopid that'll be obvious to someone. ;-) Note that this isn't yet an attempt at a final command line; there are other options I'll need to add after I get ratecontrol working. . . Thanks! ./ffmpeg -i ~/Desktop/BenQ.HD.Demo.HDTV.1080i_excerpts.mpg -coder 1 -flags +loop -g 45 -keyint_min 30 -bf 16 -b_strategy 1 -threads 2 -b 1000k -bt 100k -r 30000/1001 -subq 5 -acodec libmp3lame -vcodec libx264 -ar 44100 -s 1920x1080 -refs 2 ~/Desktop/BenQ.HD.Demo.HDTV.1080i_excerpts.flv

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FFserver live streaming
by lists＠mrnaz.com 01 Oct '08

01 Oct '08

I would like to broadcast live video from a web cam to a web page, and I would like to know if ffserver can do this. Essentially, I have a PC with a web cam. This PC will encode the webcam's feed along with the audio from a mic into a h.264+mp3 stream, and then feed it to a web server at a remote location with a large amount of bandwidth so that it can rebroadcast it to a potentially large number of viewers via an embedded flash player in a web site. Can ffmpeg + ffserver do live broadcasting in this way?

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ffmpeg SoC - Frame-based multithreading by Alexander Strange
by 2manybills＠gmail.com 01 Oct '08

01 Oct '08

Hi, all. Being a regular reader on ffmpeg-soc mail list (and other ffmpeg lists), I've been wondering how's the work progressing on Alexander's frame-based multithreading. I picked up is file on http://google-summer-of-code-2008-ffmpeg.googlecode.com/files/Alexander_Str… compiled it against trunk, but no difference was noted on h264 satellite streams on my vdr HTPC machine. Still the same (very) unbalanced work-per-core percentage instead of a real balanced work-per-core. And since Alexander's ffmpeg branch tree - http://gitorious.org/projects/ffmpeg/repos/ffmpeg-mt - isn't changed since September 4, same day file mentioned above was uploaded, I was wondering if everything is ok. Bottom line, anyone tested it? Is it going to be committed to main tree? On a side note, CONGRATULATIONS to the ffmpeg team and all it's students. 7 out of 7. Seven slots accepted by Google SoC, 7 slots with valid work presented to the community. You rock! hudo

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S16 audio formats
by pnl＠adslhome.dk 30 Sep '08

30 Sep '08

I compiled ffmpeg myself on Redhat enterprise 5.2 I try to convert an avi-movie (including the audio) to flash (flv) using the command: ffmpeg -i fejler.avi -ar 44100 new.flv I get this message in the prompt: Input #0. avi. from 'fejler.avi': Duration: 00:00:01:83. start: 0.000000. bitrate: 15105 kb/s Stream #0.0: Video: mjpeg. yuvj422p. 640x480. 30.00 tb(r) Stream #0.1: Audio: pcm_u8. 11024 Hz. mono. s16. 88 kb/s Above messege tells me that the audio is S16 format. But the conversion fails with this error: Audio resampler only works with 16 bits per sample. patch welcome. I found this: http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/2008-August/016632.html [http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/2008-August/016632.html] It tells me that the error I get should come when trying the resample non-S16 audio formats. But ffmpeg just told me, that it is S16 audio format. Could anybody explain whats wrong? Regard, Peter.

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Compile problem Mac OS 10.3.9
by elandmann＠landmanninteractive.com 30 Sep '08

30 Sep '08

Environment Mac OS 10.3.9, Dual 2GHz PPC G5, 5Gb RAM gcc version 3.3 20030304 (Apple Computer, Inc. build 1666) Trying to compile ffmpeg to use the lame library to convert .mov and .mp4 files to .flv. Using ffmpeg from SVN today (rev. 15488, 30 Sept. 2008), I have a problem getting through make. Configure seems to work with this command: ./configure --disable-altivec --enable-libmp3lame --disable-vhook --enable-static --enable-gpl ... but going to make this happens: make: *** No rule to make target `libavdevice/libavdevice.a', needed by `all'. Stop. Saw a message with a related error in the thread "Cross compile issue on Darwin / MacOSX" but couldn't determine what to change. Should I be using a different configure command? --Eric

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[Ffmpeg-user] unable to compile
by karim_marais＠yahoo.fr 30 Sep '08

30 Sep '08

Hello All. Please how downgrade FFMPEG i'm very very novice ..... (I've Debian ETCH, FFMPEG installation via SVN) witch ffmpeg revision for downgrade it for use ffmpeg-php perfectly ? Thanks for your Help -- View this message in context: http://www.nabble.com/unable-to-compile-tp19421016p19697395.html Sent from the FFmpeg-users mailing list archive at Nabble.com.

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[Ffmpeg-user] Decoding Motion-JPEG200 (mj2) Videos?
by keith.hughitt＠gmail.com 30 Sep '08

30 Sep '08

Has anyone been able to successfully decode mj2 files? The version of FFMPEG I'm using lists support for decoding m2: [code]D mov,mp4,m4a,3gp,3g2,mj2 QuickTime/MPEG4/Motion JPEG 2000 format[/code] However, when I try to convert a mj2 file (e.g. http://www.openjpeg.org/samples/Speedway.mj2) to another format, it complains about an "unsupported codec" for the input stream: [code] $ ffmpeg -i Speedway.mj2 out.mp4 FFmpeg version SVN-r15488, Copyright (c) 2000-2008 Fabrice Bellard, et al. configuration: --enable-gpl --enable-postproc --enable-libvorbis --enable-liba52 --enable-libdc1394 --enable-libgsm --disable-debug --enable-libmp3lame --enable-libfaad --enable-libfaac --enable-libxvid --enable-pthreads libavutil 49.11. 0 / 49.11. 0 libavcodec 52. 0. 0 / 52. 0. 0 libavformat 52.22. 1 / 52.22. 1 libavdevice 52. 1. 0 / 52. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 built on Sep 30 2008 12:58:40, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu7) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Speedway.mj2': Duration: 00:00:08.00, start: 0.000000, bitrate: 3018 kb/s Stream #0.0(eng): Video: Motion JPEG2000, 352x288, 25.00 tb(r) File 'out.mp4' already exists. Overwrite ? [y/N] y Output #0, mp4, to 'out.mp4': Stream #0.0(eng): Video: mpeg4, yuv420p, 352x288, q=2-31, 200 kb/s, 25.00 tb(c) Stream mapping: Stream #0.0 -> #0.0 Unsupported codec (id=0) for input stream #0.0 [/code] Anyone know whether it can be done? Any help would be greatly appreciated. Thanks! Keith -- View this message in context: http://www.nabble.com/Decoding-Motion-JPEG200-%28mj2%29-Videos--tp19746384p… Sent from the FFmpeg-users mailing list archive at Nabble.com.

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Decode Panasonic HDC-SD100 AVDHCD (H.264) videos to PAL DVD, output video plays too slow
by tra＠iki.fi 30 Sep '08

30 Sep '08

Hi, I have problems with converting videos from my new full HD camcorder (Panasonic HDC-SD100) to other formats like PAL-DVD. The PAL-DVD encoded video plays too slow. I read manuals FAQs, tried different options but no help with pure ffmpeg command. ffmpeg is very new from svn and x264 also new from git (both less than one week old) (x264 from here: http://git.videolan.org/) My basic command and output: % ffmpeg -i 00004.mts -target pal-dvd 00004.mpg FFmpeg version SVN-r15461, Copyright (c) 2000-2008 Fabrice Bellard, et al. configuration: --extra-cflags=-O3 --enable-libfaac --enable-libmp3lame --enable-liba52 --enable-liba52bin --enable-libfaad --enable-gpl --enable-libxvi d --enable-libx264 --enable-nonfree --enable-swscale libavutil 49.11. 0 / 49.11. 0 libavcodec 52. 0. 0 / 52. 0. 0 libavformat 52.22. 1 / 52.22. 1 libavdevice 52. 1. 0 / 52. 1. 0 libswscale 0. 6. 1 / 0. 6. 1 built on Sep 29 2008 15:52:37, gcc: 4.1.2 20070925 (Red Hat 4.1.2-33) Input #0, mpegts, from '00004.mts': Duration: 00:00:49.92, start: 0.374944, bitrate: 16304 kb/s Program 1 Stream #0.0[0x1011]: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 25.00 tb(r) Stream #0.1[0x1100]: Audio: liba52, 48000 Hz, 5:1, s16, 384 kb/s File '00004.mpg' already exists. Overwrite ? [y/N] y Output #0, dvd, to '00004.mpg': Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR 16:9], q=2-31, 6000 kb/s, 25.00 tb(c) Stream #0.1: Audio: ac3, 48000 Hz, 5:1, s16, 448 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 No accelerated IMDCT transform found Press [q] to stop encoding frame= 2493 fps= 8 q=3.0 Lsize= 74696kB time=49.95 bitrate=12250.0kbits/s video:70582kB audio:2732kB global headers:0kB muxing overhead 1.884725% % I have put the videos (original *.mts file and generated *.mpg file) to the address: http://www.finagility.com/testit/ My computer is too slow to run original full HD material (*.mts file) at normal speed, so I do not if the original file also plays at half of speed, could some body check it, please? I also wonder if this is bug or feature in original file, ffmpeg, x264 library or where? Then I really start to look at the trick how to avoid this. I found page: http://lists.mplayerhq.hu/pipermail/mencoder-users/2006-March/002956.html This should work when using mencoder. But it did not work for me for some reason, again wrong (half) speed when playing the video. >From this list I finally found the solution, need to run ffmpeg twice and pipe between them to yuvfps like: ffmpeg -i 00004.mts -f yuv4mpegpipe -deinterlace -sameq - \ | yuvfps -c -r 50:1 - \ | ffmpeg -f yuv4mpegpipe -i - -i 00004.mts \ -target pal-dvd 00004.mpg This seems to work and I have video with correct speed, great. But this does not seem to be very effective way to do the trick, is there any other solution? At least when I want to get very good quality output and use 2 pass decoding it takes very much time to decode the videos. I have about 5 hours *.mts videos I want to encode to PAL DVD compatible format. Probably I want to convert them also with other format like 720p HD (Xvid mpeg4 probably?) which I can run with my slow (single core) computer but better quality than normal PAL DVD mpeg2. I would appreciate any kind of tips I can do this converting: 1) as good quality as possible 2) improve speed of encoding Thanks! Regards, Tommi

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