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• Best way to pipe audio and video chunks from within python to ffmpeg

  8 mai 2016, par basilikum

  Problem

  I’m getting audio and video chunks from a third-party server and I would like to pipe those chunks to ffmpeg to create a WebM live stream according to these instructions :

  http://wiki.webmproject.org/adaptive-streaming/instructions-to-do-webm-live-streaming-via-dash

  Here they are using input from webcam and microphone but I need to use the data chunks, so the ffmpeg command would look somehow like this :

      cmd = [
  
          "ffmpeg",
  
          "-f", "flv", "-i", "video.fifo",
  
          "-f", "s16le", "-ar", "16000", "-ac", "1", "-i", "audio.fifo",
  
          "-map", "0:0",
  
          "-pix_fmt", "yuv420p",
  
          "-c:v", "libvpx-vp9",
  
          "-s", "640x480", "-keyint_min", "40", "-g", "40", "-speed", "6",
  
          "-tile-columns", "4", "-frame-parallel", "1", "-threads", "8",
  
          "-static-thresh", "0", "-max-intra-rate", "300",
  
          "-deadline", "realtime", "-lag-in-frames", "0",
  
          "-error-resilient", "1",
  
          "-b:v", "3000k",
  
          "-f", "webm_chunk",
  
          "-header", self.video_header,
  
          "-chunk_start_index", "1",
  
          "video_360_%d.chk",
  
          "-map", "1:0",
  
          "-c:a", "libvorbis",
  
          "-b:a", "16k", "-ar", "16000",
  
          "-f", "webm_chunk",
  
          "-audio_chunk_duration", "2000",
  
          "-header", self.audio_header,
  
          "-chunk_start_index", "1",
  
          "audio_171_%d.chk"
  
      ]

  As you can see, I am using a "video.fifo" and "audio.fifo" file, because I thought it would be a good idea to pipe the chunks in via a named pipe, but I can’t get it to work. Here is what I’m doing :

  p = subprocess.Popen(cmd)
  
  fa = os.open("video.fifo", os.O_WRONLY)
  
  fv = os.open("audio.fifo", os.O_WRONLY)

  So I’m starting the subprocess first, so that it opens the fifo files for reading. After that, I should be able to open them for writing but I am not. More specifically, I am able to open the first one, but not the second one. So maybe that has something to do with how ffmpeg handles its inputs if there are more than one, but I just don’t know.

  Question

  How can I either solve the problem of non openable named pipes or how can I achieve what I wanted to achieve without named pipes.

• Revision 6eec73a747 : Remove asm offset dependencies The obj_int_extract code is no longer worth main

  31 juillet 2014, par Johann

  Changed Paths :
   Delete /build/arm-msvs/obj_int_extract.bat

  
   Modify /build/make/Android.mk

  
   Modify /build/make/Makefile

  
   Modify /build/make/configure.sh

  
   Modify /build/make/gen_msvs_proj.sh

  
   Modify /build/make/gen_msvs_vcxproj.sh

  
   Modify /build/make/rtcd.pl

  
   Delete /build/x86-msvs/obj_int_extract.bat

  
   Modify /configure

  
   Modify /libs.mk

  
   Modify /solution.mk

  
   Modify /test/quantize_test.cc

  
   Modify /vp8/common/rtcd_defs.pl

  
   Delete /vp8/encoder/arm/armv5te/boolhuff_armv5te.asm

  
   Delete /vp8/encoder/arm/armv5te/vp8_packtokens_armv5.asm

  
   Delete /vp8/encoder/arm/armv5te/vp8_packtokens_mbrow_armv5.asm

  
   Delete /vp8/encoder/arm/armv5te/vp8_packtokens_partitions_armv5.asm

  
   Delete /vp8/encoder/arm/armv6/vp8_fast_quantize_b_armv6.asm

  
   Delete /vp8/encoder/arm/armv6/vp8_subtract_armv6.asm

  
   Delete /vp8/encoder/arm/boolhuff_arm.c

  
   Modify /vp8/encoder/bitstream.c

  
   Modify /vp8/encoder/bitstream.h

  
   Modify /vp8/encoder/encodeframe.c

  
   Modify /vp8/encoder/ethreading.c

  
   Modify /vp8/encoder/vp8_asm_enc_offsets.c

  
   Modify /vp8/vp8cx.mk

  
   Modify /vp8/vp8cx_arm.mk

  
   Modify /vpx_ports/arm_cpudetect.c

  
   Modify /vpx_scale/vpx_scale.mk

  
   Modify /vpx_scale/vpx_scale_asm_offsets.c

  
  
  Remove asm offset dependencies

  The obj_int_extract code is no longer worth maintaining. It creates
  significant issues when adapting for different build systems and no
  longer offers as significant of a performance benefit due to
  improvements in intrinsics.

  Source files will remain until the various third-party builds are updated.

  The neon fast quantizer has been moved to intrinsics. The armv6 version
  has been removed because so few remaining targets require it.

  Compilers and processors have improved significantly since the
  pack_tokens code was written. The assembly is no longer faster than the
  C code.

  pack_tokens were the only optimizations for the armv5te targets so the targets
  will be removed after the test infrastructure has been updated.

  BUG=710

  Change-Id : Ic785b167cd9f95eeff31c7c76b7b736c07fb30eb

• Evolution #3426 : enrichir la détection des robots

  1er novembre 2015, par Ben .

  if (!defined(’_IS_BOT’))
      define(’_IS_BOT’,
          isset($_SERVER[’HTTP_USER_AGENT’])
          AND preg_match(
          // mots generiques
          ’,bot|slurp|crawler|spider|webvac|yandex|’
          // MSIE 6.0 est un botnet 99,9% du temps, on traite donc ce USER_AGENT comme un bot
          . ’MSIE 6\.0|’
          // UA plus cibles
          . ’200please|360spider|80legs|a6-indexer|abachobot|aboundex|aboutusbot|accoona|aciorobot|addsearchbot|addthis|adressendeutschland|adsbot-google|ahrefsbot|aihitbot|alexa|altavista|amznkassocbot|analyticsseo|antbot|arabot|archive|askpeterbot|aspseek|backlinkcrawler|baidu|baiduspider|begunadvertising|bingbot|bingpreview|bitlybot|bixocrawler|blekkobot|blexbot|bloglines|brainbrubot|browsershots|bubing|bufferbot|butterfly|careerbot|catchbot|ccbot|changedetection|charlotte|chilkat|china|claritybot|classbot|cliqzbot|coccoc|cococrawler|compspybot|crawler|crawler4j|crowsnest|crystalsemanticsbot|dataminr|daumoa|dlweb|dotbot|dumbot|easouspider|ec2linkfinder|estyle|exabot|ezooms|facebookexternalhit|facebookplatform|fairshare|fast-webcrawler|feedfetcher|feedfetcher-google|feedly|feedlybot|fetch|figleafbot|flipboardproxy|fyberspider|genieo|geonabot|gigabot|google|googlebot|grapeshot|hatena-useragent|head|hosttracker|hubspot|ia_archiver|icc-crawler|ichiro|idbot|iltrovatore-setaccio|immediatenet|ina|infegyatlas|infohelfer|instapaper|ixebot|jabse|james|java|jikespider|jyxobot|kumkie|linkdex|linkfluence|linkwalker|litefinder|loadimpactpageanalyzer|luminate|lycos|lycosa|magpie-crawler|meanpathbot|mediapartners-google|metageneratorcrawler|metajobbot|mj12bot|mojeekbot|msai|msnbot|msnbot-media|msrbot|musobot|najdi|nalezenczbot|nekstbot|netcraftsurveyagent|netestate|netseer|nuhk|obot|omgilibot|openwebspider|panscient|parsijoo|plukkie|proximic|psbot|qihoobot|qirina|qualidator|queryseekerspider|rambler|readability|rogerbot|ru_bot|sbsearch|scooter|scrapy|scrubby|scrubbybloglines|searchbot|searchmetricsbot|semrushbot|seocheckbot|seoengworldbot|seokicks-robot|seznambot|shareaholic|shopwiki|showyoubot|sistrix|sitechecker|siteexplorer|slurp|socialbm_bot|sogou|sosoimagespider|sosospider|spbot|special_archiver|speedy|spider|spiderling|spiderman|spinn3r|spreadtrum|steeler|subscriber|suggybot|suma|superdownloads|surveybot|svenska-webbsido|teoma|thumbshots|tineye|trendiction|turnitinbot|tweetedtimes|tweetmeme|twitterbot|uaslinkchecker|umbot|undrip|unisterbot|unwindfetchor|urlappendbot|vedma|vkshare|vm|voilabot|wbsearchbot|wch|web|webalta|webcookies|webthumbnail|wesee|wise-guys|woko|woobot|woriobot|wotbox|y !j-bri|y !j-bro|y !j-brw|y !j-bsc|yacybot|yahoo|yahoo !|yahooysmcm|yandexbot|yats|yeti|yioopbot|yodaobot|youdaobot|zb-1|zeerch|zing-bottabot|zumbot’
          . ’,i’,(string) $_SERVER[’HTTP_USER_AGENT’])
  ) ;
  

  si le pastebin meurt :)