June 2007 - ffmpeg-devel - lists.ffmpeg.org

[FWD] [PATCH] immediate decoding of dvd stills
by nicola_sabbi＠fastwebnet.it 24 Jun '11

24 Jun '11

Some time ago someone posted this small patch to permit decoding dvd still images without setting LOW_DELAY; unfortunately it seems the patch was forgotten Is it ok to commit? If not, what's the right way to proceed?

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[PATCH] DCA-in-WAV detection
by kostya.shishkov＠gmail.com 26 Jan '11

26 Jan '11

Here is my attempt on patch discussed on Febryary 2006 Thread called "[PATCH] Fix DTS in WAV file playback."

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[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]wmv3 encoder
by fortin＠nerim.net 23 Jan '11

23 Jan '11

Hi, The following patch adds a wmv3 encoder (i removed the vc1 encoder because it doesn't generate an elementary stream). I don't think i can split the patch without breaking compilation between two patches. Please comment (particularly the vc1enc.h include in mpegvideo.c). Thanks, Denis

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[PATCH] GSM-MS decoder and encoder
by mbardiaux＠mediaxim.be 01 Feb '10

01 Feb '10

-- Michel Bardiaux R&D Director T +32 [0] 2 790 29 41 F +32 [0] 2 790 29 02 E mailto:mbardiaux at mediaxim.be Mediaxim NV/SA Vorstlaan 191 Boulevard du Souverain Brussel 1160 Bruxelles http://www.mediaxim.com/

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compressed v4l2 images
by ramiro＠lisha.ufsc.br 10 Dec '09

10 Dec '09

Hello, I have a webcam running the zc0301 driver. On the VIDIOC_S_FMT ioctl call, it always sets the pixel format to V4L2_PIX_FMT_JPEG. The current code doesn't take into account when the pixel format is changed on that call. Also, it doesn't support the compressed JPEG stream even if the pixel format is changed according to the result of the ioctl. What's the best way to make it support compressed JPEG? Just check for compressed and set appropriate codec_id? Ramiro Polla

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[PATCH] DV timecode
by baptiste.coudurier＠smartjog.com 02 Feb '09

02 Feb '09

Hi 3 patches: - add timecode.h to avoid code duplication for drop frame timecode adjustment - use new lavc timecode api to set timecode in DV. Regression tests change because now default behaviour is non drop frame timecode, you can still activate it by using -flags2 +drop_frame_timecode - timecode helper function for ffmpeg to set timecode. Maybe moving brktimegm to lavu and using it is better ? -- Baptiste COUDURIER GnuPG Key Id: 0x5C1ABAAA SMARTJOG S.A. http://www.smartjog.com Key fingerprint 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA Phone: +33 1 49966312

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[RFC] ratecontrol buffer size magic
by baptiste.coudurier＠smartjog.com 29 Nov '08

29 Nov '08

Hi, I stumbed accross a weird behaviour of the CBR ratecontrol lately, basically doing: ffmpeg -i file.mpg -vcodec mpeg2video -minrate 30000k -maxrate 30000k -b 30000k -intra -flags +ildct+low_delay -dc 10 -flags2 +ivlc+non_linear_q -ps 1 -qmin 1 -qmax 12 -top 1 -vglobal 4 -acodec pcm_s16be -f mov -bufsize 1200000 -rc_init_occupancy 1200000 cbr.mov Constraints are so in order to achieve vbv delay as 3600. Now ffmpeg will only give me qp as 24. While tweaking I changed some magic in ratecontrol.c (see patch attached) and now qp have decent/good values. I dig into svn history and found out that r2601 bumped */2 to */3 to improve CBR ratecontrol. Can anyone explain in detail why that magic does improve behaviour ? Can that parameter be user setable ? Or is it really hardcoded everywhere ? Am I doing something terribly wrong ? Thanks for comments. -- Baptiste COUDURIER GnuPG Key Id: 0x5C1ABAAA SMARTJOG S.A. http://www.smartjog.com Key fingerprint 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA Phone: +33 1 49966312

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[PATCH] CYUV encoder resurrected
by baptiste.coudurier＠smartjog.com 10 Sep '08

10 Sep '08

Hi Here is old cyuv encoder resurrected from [Ffmpeg-devel] Trellis Quantization Applied To (A)DPCM http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2006-June/011688.html by Loren. I added some #ifdef DEBUG around printf code, renamed some macros. Can it be applied ? -- Baptiste COUDURIER GnuPG Key Id: 0x5C1ABAAA SMARTJOG S.A. http://www.smartjog.com Key fingerprint 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA Phone: +33 1 49966312

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Duplicate options
by roine＠users.sourceforge.net 08 Aug '08

08 Aug '08

ffmpeg lists some options twice in the help: -threads -strict -dc -qdiff -rc_eq -aspect The subtitle options are also both in the Main section and the Subtitle section: -scodec -slang -newsubtitle It seems the duplication is due to some options being in ffmpeg.c and some in libavcodec/utils.c. I don't really understand the difference (so no patch from me), but my guess is they should be removed from ffmpeg.c. Roine

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