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• Libav/FFmpeg and Google Summer of Code 2012

  26 avril 2012, par Multimedia Mike — General, ffmpeg, gsoc, gsoc2012, hevc, libav, opus, rtmp, ut video

  So, the projects are participating in the Google Summer of Code for the 2012 season. (While Libav is the project officially accepted to particular, I still refer to the projects because FFmpeg will also benefit).

  Here are the students, projects, and mentors for this summer :

  1. Andrew D’Addesio is working on an Opus Decoder, mentored by Justin Ruggles
  2. Guillaume Martres is working on an HEVC video decoder, mentored by Mashiat Sarker Shakkhar
  3. Jan Ekström is working on an LGPL Ut Video encoder, mentored by Kostya Shishkov
  4. Jordi Ortiz is working to rewrite avserver, mentored by Luca Barbato
  5. Samuel Pitoiset is working on an RTMP[E|S|T|TE] protocol implementation, mentored by Martin Storsjö

  Wish them luck– these are some ambitious projects.

• ffmpeg disconnects with different audio sample rate

  11 juillet 2017, par HRG

  Am using ffmpeg transcoder tool to convert a streaming audio input to another format.The raw audio data comes from a input device in wav format (.wmv) which can be accessed via server port (ex.8080) . The audio format is in wav with 16bits/sample and sample rate of 6000 hz.
  When I use ffmpeg to read this audio input with above specs and convert to another format it works fine.

  Ex.
  ffmpeg -f s16le -ar 6000 -ac 1 -i http://local:8080/sampleaudio.wmv -f webm out.webm

  But if i use fmmpeg to read the audio input at sample rate of 4000hz (other than the actual rate) ,it disconnects from the server always .

  Ex.
  ffmpeg -f s16le -ar 4000 -ac 1 -i http://local:8080/sampleaudio.wmv -f webm out.webm

  The error in the ffmpeg console is "Stream ends prematurely at 194604, should be 4800044"

  I know the input rate at which ffmpeg is reading and the actual audio output is different .But am curious to know

  why ffmpeg is disconnecting from the server ,what is happening behind the scene.

  Also how to enable logs for network connections(http,sockets..)

  Thanks

• building ffmpeg 2.1.8 with MSVC2013 (configure produces errors)

  29 juin 2017, par scaram

  I am trying to build ffmpeg 2.1.8 for a legacy project. I use windows 10, MSVC 2013, MSYS, YASM and this tutorial.

  After

  ./configure --toolchain=msvc --enable-shared

  I see the many errors in config.log, here the first three ones

  1. error : ’test’ declared as an array with a negative size
  2. fatal error C1189 : #error : "unsatisfied condition : defined GLIBC"
  3. fatal error C1083 : File (Include) cannot be opened : "newlib.h" : No such file or directory

  here the more detailed information...

  C:/Users/scaram/AppData/Local/Temp/ffconf.LgAWDJFi.o_preprocessed.c:8859:27: error: 'test' declared as an array with a negative size
  
  ffconf.LgAWDJFi.o_converted.c
  
  C:/Users/scaram/AppData/Local/Temp/ffconf.RncapARb.c(1) : error C2118: Negativer Index
  
  check_cpp_condition features.h defined __UCLIBC__
  
  check_cpp
  
  BEGIN /tmp/ffconf.RncapARb.c
  
      1   #include 
  
      2   #if !(defined __UCLIBC__)
  
      3   #error "unsatisfied condition: defined __UCLIBC__"
  
      4   #endif
  
  END /tmp/ffconf.RncapARb.c
  
  c99wrap cl -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -nologo -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64 -P -Fi /tmp/ffconf.LgAWDJFi.o /tmp/ffconf.RncapARb.c
  
  ffconf.RncapARb.c
  
  C:/Users/scaram/AppData/Local/Temp/ffconf.RncapARb.c(3) : fatal error C1189: #error :  "unsatisfied condition: defined __UCLIBC__"
  
  check_cpp_condition features.h defined __GLIBC__
  
  check_cpp
  
  BEGIN /tmp/ffconf.RncapARb.c
  
      1   #include 
  
      2   #if !(defined __GLIBC__)
  
      3   #error "unsatisfied condition: defined __GLIBC__"
  
      4   #endif
  
  END /tmp/ffconf.RncapARb.c
  
  c99wrap cl -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -nologo -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64 -P -Fi /tmp/ffconf.LgAWDJFi.o /tmp/ffconf.RncapARb.c
  
  ffconf.RncapARb.c
  
  C:/Users/scaram/AppData/Local/Temp/ffconf.RncapARb.c(3) : fatal error C1189: #error :  "unsatisfied condition: defined __GLIBC__"
  
  check_cpp_condition newlib.h defined _NEWLIB_VERSION
  
  check_cpp
  
  BEGIN /tmp/ffconf.RncapARb.c
  
      1   #include 
  
      2   #if !(defined _NEWLIB_VERSION)
  
      3   #error "unsatisfied condition: defined _NEWLIB_VERSION"
  
      4   #endif
  
  END /tmp/ffconf.RncapARb.c
  
  c99wrap cl -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -nologo -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64 -P -Fi /tmp/ffconf.LgAWDJFi.o /tmp/ffconf.RncapARb.c
  
  ffconf.RncapARb.c
  
  C:/Users/scaram/AppData/Local/Temp/ffconf.RncapARb.c(1) : fatal error C1083: File (Include) cannot be opened: "newlib.h": No such file or directory
  
  check_header _mingw.h
  
  check_cpp
  
  BEGIN /tmp/ffconf.RncapARb.c
  
      1   #include <_mingw.h>
  
      2   int x;
  
  END /tmp/ffconf.RncapARb.c

  What can I do to make it work ?