February 2006 - ffmpeg-devel - lists.ffmpeg.org

[PATCH] Apple Video Encoder (rpza)
by ffmpeg.php＠gmail.com 24 Jan '11

24 Jan '11

Attached is a patch to add support for Apple Video encoding (rpza). The quality settings are defined at compile time right now since I wasn't really sure how to map ffmpeg's numerous video options to the capabilities of rpza. It supports all rpza encoding opcodes but the 4-color block encoding doesn't try to do multiblock runs yet. -Todd

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[PATCH] Vorbis I floor type 0 support
by eclipse7＠gmx.net 16 Mar '08

16 Mar '08

Hi, i extended the ffmpeg vorbis decoder to decode vorbis floor0 files. It is my first try at this kind of stuff. I only had one sample tho testing wasn't too exhaustive. I tested the code on linux x86 and Solaris SPARC so far. As always comments and testers welcome. Have fun, Alex (beastd)

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Read from a buffer instead of a file
by raphaelh＠nist.gov 08 Mar '07

08 Mar '07

Hi, is it possible to read video from a buffer instead of a file with libav(codec/format) ? I have MPEG2-TS video in a buffer, and cannot use "av_open_input_file" and the "av_read_frame" on a buffer, it only works from a file. Anyone has an idea how to do that ? Thanks in advance, --Raphael HUCK

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Possible bug in h264 dec
by francis_labonte＠hotmail.com 23 Jan '07

23 Jan '07

Hi, Runnning valgrind on a file, I got some invlid read. It points to: H264_CHROMA_MC8_TMPL in dsputil_h264_template_mmx.c called by mc_dir_part in h264.c In my opinion, I think it could come from here: if( full_mx < 0-extra_width || full_my < 0-extra_height || full_mx + 16/*FIXME*/ > pic_width + extra_width || full_my + 16/*FIXME*/ > pic_height + extra_height) "<" should become "<=" for the 2 FIXME. An index ( mx, my) ranging from 0-... is compared to a size ranging from 1-,,, Applying my modification fix my invalid. I would like to have have some input to know if my analysis make sens or not! Thank you Francis NOTE: I'me not using the latest version of CVS, but this line didn't change in HEAD, and a friend told me he got similar result with HEAD version.

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SIGSEGV in h264.c, stream is available for debugging
by dario＠ip.tv 23 Jan '07

23 Jan '07

> > I've got a SIGSEGV decoding h264, the stream was generated by x264. > > > The following stream was recorded live and begins from the middle: > > > http://www.datscom.com.br/~dario/dump.SIGSEGV.h264 > > >the following command line reproduces the fault (the source code is updated >from cvs as of 09/05/2005 08:13pm GMT-3). > >$ ./ffmpeg -i dump.SIGSEGV.h264 -f null dump.SIGSEGV.h264.null > Has anyone got any status on that subject? Anyway, I've managed to increase the number of max reference pics (at least from what I could understand from the code), from 16 to 32 in h264.c, and it seems to help a little (the stream above now decodes to the end). btw, nice symbolic constants would be nicer than things like that spread all over the code: for (i = 0; i < 16; i++) ... Picture* delayed_pics[16]; etc... :-) The above stream now decodes ok, but the following one fails with "getbuffer() failed" and consequently (no checks for the getbuffer calls) SIGSEGV. I assume there is some leak somewhere? http://bule.ip.tv/~dario/dump.SIGSEGV.1.h264 Again, I'd appreciate any help on the subject. Regards, Dario Andrade R&D IP.TV

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PATCH: make libavformat find codecid for AAC streams in matroska container.
by elupus＠ecce.se 30 Oct '06

30 Oct '06

Hi, Here is a small patch to allow libavformat to find the codec on AAC streams in matroska containers. The defines for the AAC codec's are set like this, #define MATROSKA_CODEC_ID_AUDIO_MPEG2 "A_AAC/MPEG2/" #define MATROSKA_CODEC_ID_AUDIO_MPEG4 "A_AAC/MPEG4/" which isn't the full name for the codec's. I.e. it normally has some more extension to it like MAIN, LC... Anyway, this patch fixes so that when the codec_id is compared to these defines, only the given length is compared (which I think was the original idea). I suppose some more information could be gotten from that extra information, but I think this should be enough. Cheers /Joakim

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[PATCH] qpel approximation
by lorenm＠u.washington.edu 01 Oct '06

01 Oct '06

This patch adds approximate bilinear qpel mc functions, enabled for B-frames only, with -lavdopts fast. Comments: does it look ok? should it have a separate option? 16x16 mc costs, averaged over all subpel positions: mpeg4 qpel: 1443 cycles h264 qpel: 1148 cycles bilinear qpel: 174 cycles mpeg4 hpel: 99 cycles total speedup: ~12% in mpeg4, ~5% in h264. --Loren Merritt

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[PATCH] demuxer for dcinema audio
by Reimar.Doeffinger＠stud.uni-karlsruhe.de 30 Aug '06

30 Aug '06

Hi, I'd like to suggest the attached patch for demuxing D-Cinema audio. It's not exactly beautiful since it does something like decoding (changing the bit order), but I though it to be the easier solution over adding a special decoder (since it isn't used anywhere else). The smil file that came with it said it was of the format "audio/302m", and I assume it is SMPTE 302M uncompressed audio, but I don't have the specs. Please tell me what you think about it... Oh, some samples (I already extended the MPlayer mpeg demuxer to play the gxf file): Address: ftp://www.ropa-net.de Username: web49f4 Password: 123456 Greetings, Reimar D?ffinger

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How to encode videos using libavcodec/libavformat DLLs?
by Lars.Blumberg＠aquasoft.de 20 Jun '06

20 Jun '06

Hello! I want to use the libavcodec/libavformat DLLs to encode a video/sound stream. Therefore I want to put every single frame into the stream. Is there any place where I can find some information about how to do that, may be a sample application, tutorial or something like that? I am programming with Delphi, but I guess als VC++ or VB code would be helpfull. I want to load the DLLs dynamically into the application. Thanks for any comments. Sincerly Lars

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[PATCH] Fix DTS in WAV file playback.
by ben＠geexbox.org 07 May '06

07 May '06

Hi, The following patch allow playback of WAV files with broken DTS format ID. Currently, DTS codec is supposed to be referenced as 0x2001 but I've never seen a sample with such an ID. Most of DTS samples in WAV are using 0x01 (which is PCM reserved) which is of course a broken behavior, but so is life. So the patch checks for begining of bytestream to match some DTS known-bytestream. Here are some samples of DTS in WAV. Maybe they could be added to multimedia.cx, Mike ? (all are free to use). - http://www.sr.se/laddahem/MultiKanal/Dts/SURROUNDTEST_011212.zip (test sample) from http://www.sr.se/multikanal/english/e_index.stm - http://www.kellyindustries.com/downloads/dts-44k_diatonis-soal.zip (test sample 2) from http://www.kellyindustries.com/sounds.html#dts_downloads More DTS samples available from http://www.dts-phile.com/downloads/download-main.html (french page sorry but pointing to english websites). Ben -- "My life, and by extension everyone else's is meaningless." Bender, Futurama

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