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• Why ffmpeg C - API Doxygen document using c++ style of namespace for structure

  25 décembre 2018, par Vencat

  I’m new to ffmpeg C-API and learning it from doxygen document in official site. I hope the document explains about ffmpeg C-API, but I have seen some c++ style of class and namespace in it, for example please refer the below document part, where they are using c++ style of namespace for c structure.

  AVClass Struct Reference :

  https://ffmpeg.org/doxygen/trunk/structAVClass.html#details

  can anyone clear this to me.?

• ffmpeg's av_read_frame will block or not ?

  24 janvier 2020, par Daniel

  There is a question posted on StackOverflow that asks if there is any mode to wait until a valid data comes with av_read_frame : link.

  My question is the opposite :
  Can I be sure that this method will always return with either -1, 0 or 1 ?

  I.e. it will not block ? In the official docs, there is no mention on this subject.

  Some threads also mention setting up an interrupt callback for this purpose.

  But I would need a solid non-blocking call which means I can do other tasks during waiting for a network video. If there is no exact way to define if av_read_frame can be set to non-blocking I would go with threads but I’d rather not doing that.

• convert youtube video to mp3

  31 août 2015, par Try Mersianto

  i want to convert video from youtube to mp3 format ,
  i have try to get real path and i got url like this (http://r9---sn-npo7en7d.googlevideo.com/videoplayback?mm=31&mn=sn-npo7en7d&ratebypass=yes&mime=video/webm&source=youtube&pl=18&dur=0.000&sver=3&expire=1440995594&mt=1440973944&mv=m&ms=au&sparams=dur,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pl,ratebypass,source,upn,expire&signature=27B5A991402F61990D7D97C423D167C51B984E11.FA358ECCB3BAC29953749463A37659BB4ADDF4AB&fexp=9405997,9408214,9408511,9408710,9409069,9413318,9415365,9415485,9416023,9416105,9416126,9416524,9417097,9417126,9417707,9418153,9418409,9418448,9418700,9419239,9420020,9420056&ipbits=0&ip=128.199.181.252&key=yt5&lmt=1413466470642964&initcwndbps=15202500&itag=43&id=010d2b7ac9d709c1&upn=ZmvSS1PBRW0&signature=%20%27&title=%27Hardwell-feat-Chris-Jones---Young-Again-Official-Video-HD%27)

  i tried to convert it with ffmpeg command like ffmpeg -i the-url play.mp3 but it fail,
  am i wrong when getting the URL or wrong when using ffmpeg command ?
  anyone can help me ? ,
  i cant using youtube-dl because i do this for my project
  thanks