Recherche avancée
Autres articles (80)
-
Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
-
Participer à sa traduction
10 avril 2011Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
Actuellement MediaSPIP n’est disponible qu’en français et (...) -
Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)
Sur d’autres sites (12732)
-
arm : vp9itxfm16 : Do a simpler half/quarter idct16/idct32 when possible
24 février 2017, par Martin Storsjöarm : vp9itxfm16 : Do a simpler half/quarter idct16/idct32 when possible
This work is sponsored by, and copyright, Google.
This avoids loading and calculating coefficients that we know will
be zero, and avoids filling the temp buffer with zeros in places
where we know the second pass won’t read.This gives a pretty substantial speedup for the smaller subpartitions.
The code size increases from 14516 bytes to 22484 bytes.
The idct16/32_end macros are moved above the individual functions ; the
instructions themselves are unchanged, but since new functions are added
at the same place where the code is moved from, the diff looks rather
messy.Before : Cortex A7 A8 A9 A53
vp9_inv_dct_dct_16x16_sub1_add_10_neon : 454.0 270.7 418.5 295.4
vp9_inv_dct_dct_16x16_sub2_add_10_neon : 3840.2 3244.8 3700.1 2337.9
vp9_inv_dct_dct_16x16_sub4_add_10_neon : 4212.5 3575.4 3996.9 2571.6
vp9_inv_dct_dct_16x16_sub8_add_10_neon : 5174.4 4270.5 4615.5 3031.9
vp9_inv_dct_dct_16x16_sub12_add_10_neon : 5676.0 4908.5 5226.5 3491.3
vp9_inv_dct_dct_16x16_sub16_add_10_neon : 6403.9 5589.0 5839.8 3948.5
vp9_inv_dct_dct_32x32_sub1_add_10_neon : 1710.7 944.7 1582.1 1045.4
vp9_inv_dct_dct_32x32_sub2_add_10_neon : 21040.7 16706.1 18687.7 13193.1
vp9_inv_dct_dct_32x32_sub4_add_10_neon : 22197.7 18282.7 19577.5 13918.6
vp9_inv_dct_dct_32x32_sub8_add_10_neon : 24511.5 20911.5 21472.5 15367.5
vp9_inv_dct_dct_32x32_sub12_add_10_neon : 26939.5 24264.3 23239.1 16830.3
vp9_inv_dct_dct_32x32_sub16_add_10_neon : 29419.5 26845.1 25020.6 18259.9
vp9_inv_dct_dct_32x32_sub20_add_10_neon : 31146.4 29633.5 26803.3 19721.7
vp9_inv_dct_dct_32x32_sub24_add_10_neon : 33376.3 32507.8 28642.4 21174.2
vp9_inv_dct_dct_32x32_sub28_add_10_neon : 35629.4 35439.6 30416.5 22625.7
vp9_inv_dct_dct_32x32_sub32_add_10_neon : 37269.9 37914.9 32271.9 24078.9After :
vp9_inv_dct_dct_16x16_sub1_add_10_neon : 454.0 276.0 418.5 295.1
vp9_inv_dct_dct_16x16_sub2_add_10_neon : 2336.2 1886.0 2251.0 1458.6
vp9_inv_dct_dct_16x16_sub4_add_10_neon : 2531.0 2054.7 2402.8 1591.1
vp9_inv_dct_dct_16x16_sub8_add_10_neon : 3848.6 3491.1 3845.7 2554.8
vp9_inv_dct_dct_16x16_sub12_add_10_neon : 5703.8 4831.6 5230.8 3493.4
vp9_inv_dct_dct_16x16_sub16_add_10_neon : 6399.5 5567.0 5832.4 3951.5
vp9_inv_dct_dct_32x32_sub1_add_10_neon : 1722.1 938.5 1577.3 1044.5
vp9_inv_dct_dct_32x32_sub2_add_10_neon : 15003.5 11576.8 13105.8 9602.2
vp9_inv_dct_dct_32x32_sub4_add_10_neon : 15768.5 12677.2 13726.0 10138.1
vp9_inv_dct_dct_32x32_sub8_add_10_neon : 17278.8 14825.4 14907.5 11185.7
vp9_inv_dct_dct_32x32_sub12_add_10_neon : 22335.7 21544.5 20379.5 15019.8
vp9_inv_dct_dct_32x32_sub16_add_10_neon : 24165.6 23881.7 21938.6 16308.2
vp9_inv_dct_dct_32x32_sub20_add_10_neon : 31082.2 30860.9 26835.3 19711.3
vp9_inv_dct_dct_32x32_sub24_add_10_neon : 33102.6 31922.8 28638.3 21161.0
vp9_inv_dct_dct_32x32_sub28_add_10_neon : 35104.9 34867.5 30411.7 22621.2
vp9_inv_dct_dct_32x32_sub32_add_10_neon : 37438.1 39103.4 32217.8 24067.6Signed-off-by : Martin Storsjö <martin@martin.st>
-
FFMPEG encode video with alpha channel to flv
29 octobre 2013, par treeI'm trying to encode a video (mov) to an flv with alpha channel in FFMPEG but I can't seem to either
- find a codec that is supported
- find one that actually maintains the alpha
Does anyone know how to set that up ?
Thanks,
ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800 test4.flv
here is the report...
ffmpeg started on 2013-10-25 at 15:47:30
Report written to "ffmpeg-20131025-154730.log"
Command line:
ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800 test4.flv -report
ffmpeg version N-57367-g2f31b73 Copyright (c) 2000-2013 the FFmpeg developers
built on Oct 23 2013 20:34:17 with gcc 4.8.2 (GCC)
configuration: --disable-static --enable-shared --enable-gpl --enable-version3 -- disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r -- enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable- libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame -- enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 47.101 / 52. 47.101
libavcodec 55. 38.101 / 55. 38.101
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 89.100 / 3. 89.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Splitting the commandline.
Reading option '-i' ... matched as input file with argument 'abc_btr_1280x800_Takeover.mov'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'flv'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv444p'.
Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1280x800'.
Reading option 'test4.flv' ... matched as output file.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file abc_btr_1280x800_Takeover.mov.
Successfully parsed a group of options.
Opening an input file: abc_btr_1280x800_Takeover.mov.
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] ISO: File Type Major Brand: qt
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position before avformat_find_stream_info() is 281624339
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position after avformat_find_stream_info() is 288732
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'abc_btr_1280x800_Takeover.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2013-09-22 02:50:18
Duration: 00:00:10.00, start: 0.000000, bitrate: 225299 kb/s
Stream #0:0(eng), 1, 1/24: Video: qtrle (rle / 0x20656C72), bgra, 1280x800, 225293 kb/s, SAR 1280:1280 DAR 8:5, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
Metadata:
creation_time : 2013-09-22 02:50:18
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Stream #0:1(eng), 0, 1/24: Data: none (tmcd / 0x64636D74), 0 kb/s (default)
Metadata:
creation_time : 2013-09-22 02:50:22
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Successfully opened the file.
Parsing a group of options: output file test4.flv.
Applying option vcodec (force video codec ('copy' to copy stream)) with argument flv.
Applying option pix_fmt (set pixel format) with argument yuv444p.
Applying option s (set frame size (WxH or abbreviation)) with argument 1280x800.
Successfully parsed a group of options.
Opening an output file: test4.flv.
Successfully opened the file.
detected 4 logical cores
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'video_size' to value '1280x800'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pix_fmt' to value '30'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'time_base' to value '1/24'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pixel_aspect' to value '1280/1280'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'frame_rate' to value '24/1'
[graph 0 input from stream 0:0 @ 0000000000303bc0] w:1280 h:800 pixfmt:bgra tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'w' to value '1280'
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'h' to value '800'
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'flags' to value '0x4'
[scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 flags:'0x4' interl:0
Incompatible pixel format 'yuv444p' for codec 'flv', auto-selecting format 'yuv420p'
[format @ 00000000002f8320] compat: called with args=[yuv420p]
[format @ 00000000002f8320] Setting 'pix_fmts' to value 'yuv420p'
[AVFilterGraph @ 000000000085bc60] query_formats: 5 queried, 4 merged, 0 already done, 0 delayed
[scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 fmt:bgra sar:1/1 -> w:1280 h:800 fmt:yuv420p sar:1/1 flags:0x4
[flv @ 0000000000374be0] intra_quant_bias = 0 inter_quant_bias = -64
Output #0, flv, to 'test4.flv':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
encoder : Lavf55.19.104
Stream #0:0(eng), 0, 1/1000: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 1280x800 [SAR 1:1 DAR 8:5], q=2-31, 200 kb/s, 1k tbn, 24 tbc (default)
Metadata:
creation_time : 2013-09-22 02:50:18
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Stream mapping:
Stream #0:0 -> #0:0 (qtrle -> flv)
Press [q] to stop, [?] for help
frame= 27 fps=0.0 q=31.0 size= 351kB time=00:00:01.12 bitrate=2554.2kbits/s
frame= 46 fps= 45 q=31.0 size= 477kB time=00:00:01.91 bitrate=2039.5kbits/s
frame= 60 fps= 39 q=31.0 size= 543kB time=00:00:02.50 bitrate=1779.4kbits/s
frame= 74 fps= 36 q=31.0 size= 629kB time=00:00:03.08 bitrate=1672.4kbits/s
frame= 96 fps= 37 q=31.0 size= 795kB time=00:00:04.00 bitrate=1627.4kbits/s
frame= 123 fps= 40 q=31.0 size= 924kB time=00:00:05.12 bitrate=1477.0kbits/s
frame= 149 fps= 41 q=31.0 size= 1133kB time=00:00:06.20 bitrate=1494.7kbits/s
frame= 175 fps= 43 q=31.0 size= 1224kB time=00:00:07.29 bitrate=1375.5kbits/s
frame= 201 fps= 44 q=31.0 size= 1352kB time=00:00:08.37 bitrate=1322.7kbits/s
frame= 228 fps= 45 q=31.0 size= 1461kB time=00:00:09.50 bitrate=1260.1kbits/s
[output stream 0:0 @ 00000000003053c0] EOF on sink link output stream 0:0:default.
No more output streams to write to, finishing.
frame= 240 fps= 45 q=31.0 Lsize= 1600kB time=00:00:10.00 bitrate=1310.4kbits/s
video:1596kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.252476%
240 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000000000032dfc0] Statistics: 3 seeks, 242 writeouts
[AVIOContext @ 000000000085bde0] Statistics: 281664506 bytes read, 3 seeks -
FFMPEG enocde flv with alpha channel
25 octobre 2013, par treeI'm trying to encode a video (mov) to an flv with alpha channel in FFMPEG but I can't seem to either
- find a codec that is supported
- find one that actually maintains the alpha
Does anyone know how to set that up ?
Thanks,
ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800 test4.flv
here is the report...
ffmpeg started on 2013-10-25 at 15:47:30
Report written to "ffmpeg-20131025-154730.log"
Command line:
ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800 test4.flv -report
ffmpeg version N-57367-g2f31b73 Copyright (c) 2000-2013 the FFmpeg developers
built on Oct 23 2013 20:34:17 with gcc 4.8.2 (GCC)
configuration: --disable-static --enable-shared --enable-gpl --enable-version3 -- disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r -- enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable- libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame -- enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 47.101 / 52. 47.101
libavcodec 55. 38.101 / 55. 38.101
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 89.100 / 3. 89.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Splitting the commandline.
Reading option '-i' ... matched as input file with argument 'abc_btr_1280x800_Takeover.mov'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'flv'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv444p'.
Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1280x800'.
Reading option 'test4.flv' ... matched as output file.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file abc_btr_1280x800_Takeover.mov.
Successfully parsed a group of options.
Opening an input file: abc_btr_1280x800_Takeover.mov.
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] ISO: File Type Major Brand: qt
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position before avformat_find_stream_info() is 281624339
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position after avformat_find_stream_info() is 288732
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'abc_btr_1280x800_Takeover.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2013-09-22 02:50:18
Duration: 00:00:10.00, start: 0.000000, bitrate: 225299 kb/s
Stream #0:0(eng), 1, 1/24: Video: qtrle (rle / 0x20656C72), bgra, 1280x800, 225293 kb/s, SAR 1280:1280 DAR 8:5, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
Metadata:
creation_time : 2013-09-22 02:50:18
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Stream #0:1(eng), 0, 1/24: Data: none (tmcd / 0x64636D74), 0 kb/s (default)
Metadata:
creation_time : 2013-09-22 02:50:22
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Successfully opened the file.
Parsing a group of options: output file test4.flv.
Applying option vcodec (force video codec ('copy' to copy stream)) with argument flv.
Applying option pix_fmt (set pixel format) with argument yuv444p.
Applying option s (set frame size (WxH or abbreviation)) with argument 1280x800.
Successfully parsed a group of options.
Opening an output file: test4.flv.
Successfully opened the file.
detected 4 logical cores
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'video_size' to value '1280x800'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pix_fmt' to value '30'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'time_base' to value '1/24'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pixel_aspect' to value '1280/1280'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'frame_rate' to value '24/1'
[graph 0 input from stream 0:0 @ 0000000000303bc0] w:1280 h:800 pixfmt:bgra tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'w' to value '1280'
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'h' to value '800'
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'flags' to value '0x4'
[scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 flags:'0x4' interl:0
Incompatible pixel format 'yuv444p' for codec 'flv', auto-selecting format 'yuv420p'
[format @ 00000000002f8320] compat: called with args=[yuv420p]
[format @ 00000000002f8320] Setting 'pix_fmts' to value 'yuv420p'
[AVFilterGraph @ 000000000085bc60] query_formats: 5 queried, 4 merged, 0 already done, 0 delayed
[scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 fmt:bgra sar:1/1 -> w:1280 h:800 fmt:yuv420p sar:1/1 flags:0x4
[flv @ 0000000000374be0] intra_quant_bias = 0 inter_quant_bias = -64
Output #0, flv, to 'test4.flv':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
encoder : Lavf55.19.104
Stream #0:0(eng), 0, 1/1000: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 1280x800 [SAR 1:1 DAR 8:5], q=2-31, 200 kb/s, 1k tbn, 24 tbc (default)
Metadata:
creation_time : 2013-09-22 02:50:18
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Stream mapping:
Stream #0:0 -> #0:0 (qtrle -> flv)
Press [q] to stop, [?] for help
frame= 27 fps=0.0 q=31.0 size= 351kB time=00:00:01.12 bitrate=2554.2kbits/s
frame= 46 fps= 45 q=31.0 size= 477kB time=00:00:01.91 bitrate=2039.5kbits/s
frame= 60 fps= 39 q=31.0 size= 543kB time=00:00:02.50 bitrate=1779.4kbits/s
frame= 74 fps= 36 q=31.0 size= 629kB time=00:00:03.08 bitrate=1672.4kbits/s
frame= 96 fps= 37 q=31.0 size= 795kB time=00:00:04.00 bitrate=1627.4kbits/s
frame= 123 fps= 40 q=31.0 size= 924kB time=00:00:05.12 bitrate=1477.0kbits/s
frame= 149 fps= 41 q=31.0 size= 1133kB time=00:00:06.20 bitrate=1494.7kbits/s
frame= 175 fps= 43 q=31.0 size= 1224kB time=00:00:07.29 bitrate=1375.5kbits/s
frame= 201 fps= 44 q=31.0 size= 1352kB time=00:00:08.37 bitrate=1322.7kbits/s
frame= 228 fps= 45 q=31.0 size= 1461kB time=00:00:09.50 bitrate=1260.1kbits/s
[output stream 0:0 @ 00000000003053c0] EOF on sink link output stream 0:0:default.
No more output streams to write to, finishing.
frame= 240 fps= 45 q=31.0 Lsize= 1600kB time=00:00:10.00 bitrate=1310.4kbits/s
video:1596kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.252476%
240 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000000000032dfc0] Statistics: 3 seeks, 242 writeouts
[AVIOContext @ 000000000085bde0] Statistics: 281664506 bytes read, 3 seeks
Syndiquer tout le site
