November 2008 - ffmpeg-devel - lists.ffmpeg.org

yuv2rgb_template.c uses MOVNTQ but not SFENCE?
by Reimar.Doeffinger＠stud.uni-karlsruhe.de 12 Jan '10

12 Jan '10

Can someone comment if this is right? It seems like a bug according to the documentation I have... Greetings, Reimar D?ffinger

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[RFC] H.264/SQV3 separation: h264data.h
by diego＠biurrun.de 11 Jan '10

11 Jan '10

Next up on the list is moving the tables in h264data.h to a .c file that can be compiled and shared by the H.264 and SVQ3 decoder. This requires adding an ff_ prefix to the names of the tables, removing the static keyword and then moving h264data.h to h264data.c while replacing the contents of h264data.h with appropriate extern declarations. I have done this in my local tree, but the patch is 174kB big (and terribly boring), so I'm not sending it here. OK to proceed (in several steps)? Will this need to be benchmarked at some point? Diego

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[PATCH] Function to parse Dirac sequence header
by lessen42＠gmail.com 11 Jan '10

11 Jan '10

Hi, This will be useful for both the dirac parser and ogg demuxer (and future native dirac decoder of course.) Adapted from the soc repository.

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[PATCH] Make ffplay define in the encoder the number of threads *before* to open it
by stefano.sabatini-lala＠poste.it 28 Dec '09

28 Dec '09

Hi, as in $subject. If threads support is not enabled and threads count is set to a value greater than MAX_THREADS (currently is 8), then encoder is initialized with a value of thread_count equal to 1, then enc->threads_count is set to the value set by the user, finally libavcodec crashes when it tryies to free the first thread beyond MAX_THREADS (this happens when quitting ffplay). Check it with: ffplay -threads 1000 FILE.flv (crashes in libavcodec/mpegvideo.c:MPV_common_end) With the patch we get: stefano at geppetto ~> ~/src/ffmpeg/ffplay -threads 1000 FILE.flv Warning: not compiled with thread support, using thread emulation [flv @ 0x83fba40]too many threads then ffplay reproduces the file with no video. Best regards. -- Stefano Sabatini Linux user number 337176 (see http://counter.li.org)

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[PATCH]muxing chapters in ffmpeg/matroska
by wyskas＠gmail.com 27 Dec '09

27 Dec '09

Hi, this patch add support for muxing chapters to ffmpeg.c and matroskaenc. Chapters are copied with -map_meta_data option. Anton

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[PATCH] estimate stream durations using read_timestamp
by elupus＠ecce.se 27 Dec '09

27 Dec '09

Hi, Here is a patch for libavformat to estimate stream durations using the read_timestamp interface. This could most likely replace the special casing for mpeg using read_packet. Thou i've not yet checked that. Joakim Ps. Patch probably applies at an offset, but it's not against latest svn. Will resend with that after inital comments.

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[PATCH] 'vorbis_residue_decode' optimizations
by siarhei.siamashka＠gmail.com 20 Dec '09

20 Dec '09

Hi, This trivial patch improves overall vorbis decoding performance by ~3% on Pentium-M with gcc 4.2.3 Maybe some variations of it can provide even more improvement (more separate implementations for the typical values of 'ch' and 'vlen'). Respecting CONFIG_SMALL would be also a good idea. Anyway, 'vorbis_residue_decode' is currently one of the parts of ffvorbis decoder that takes quite a lot of time, adding some optimizations to it (including those that are already mentioned as FIXME in the sources) should help quite a lot. -- Best regards, Siarhei Siamashka

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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] libavdevice/x11grab.c XFixesGetCursorImage support
by roxis＠list.ru 27 Nov '09

27 Nov '09

I made a patch to add real cursor support in x11grab. But i'm not a c programmer, patch is far from ideal but works for me. I would like, if someone made it proper, add alpha blending and made command line options for no cursor / dummy cursor / real cursor. Thanks.

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[PATCH] another AC3 descriptor for MPEG-TS
by Nicola.Sabbi＠poste.it 20 Oct '09

20 Oct '09

Somewhere in incoming there's a sample (whose name I forgot, uploaded by a user < 2 months ago) that has a stream_type == 0x8N and a registration descriptor==AC-3, that is a valid AC3 identifier. Attached patch supports it

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