Recherche avancée

Sur d’autres sites (8873)

• Android-How to pass back frames from FFmpeg back to Android

  23 octobre 2013, par yarin

  It is an architecture question-i am really interesting about the answer

  I building an app with following goals :

  1.record video with effect in real time(using FFmpeg)

  2.display the customized video in real time for the user while he recording

  So,after 1 month of working...i decide to remember that goal number 2 is worth to thinking about :)
  I have a ready skeleton app that record video with effect in real time.
  but i have to preview this customized frame back to the user.

  My options (and this is my question) :

  1.Each frame that pass from onPreviewFrame(byte[] video_frame_data, Camera camera) to ffmpeg with JNI to encode-will sending back to android through the same JNI after i apply the effects(i mean : onPreviewFrame->JNI to FFMPEG->immediately apply effect->send the costumed frame back to android side for display->encode the costumed frame).

  Advantages : it is look like is the most easy to use.

  Disadvantages : use the JNI twice or the passing back the frame could consume time(i really don't now if it really big price to pay,cuz it is only byte array or int array per frame to send to android side)

  2.I heard about openGL on ndk,but i think that the surface it self created on the android side-so is it really going to be better ?
  i prefer to use other surface that i using now in java

  3.Create an video player on FFmpeg to preview each customized frame in real time.

  Thank for your helping,i hope that the first solution is available and not consume to much expensive time in terms of real time processing

• libFLAC : Add a workaround for a bug in MSVC2105 update2

  5 mai 2016, par Erik de Castro Lopo

  libFLAC : Add a workaround for a bug in MSVC2105 update2
  MSVC2105 update2 compiles the C code :
      abs_residual_partition_sums[partition] =
  
                    (FLAC__uint32)_mm_cvtsi128_si32(mm_sum) ;
  into this :
      movq    QWORD PTR [rsi], xmm2
  while it should be :
      movd    eax, xmm2
  
      mov     QWORD PTR [rsi], rax
  With this patch, MSVC emits :
      movq    QWORD PTR [rsi], xmm2
  
      mov     DWORD PTR [rsi+4], r9d
  so the price of this workaround is 1 extra write instruction per
  
  partition.
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] src/libFLAC/stream_encoder_intrin_avx2.c
  • [DH] src/libFLAC/stream_encoder_intrin_sse2.c
  • [DH] src/libFLAC/stream_encoder_intrin_ssse3.c

• Extract just the audio link from a youtube video without converting

  19 janvier 2017, par kamron shaw

  I know there are hundreds of sites to convert youtube video to mp3. Most of them do it by first downloading the video and then converting it to mp3(or any other audio format) on their server using youtube-dl, ffmpeg or similar programs.

  What I want to know is, is there any way I can just extract the audio link for any youtube video ? I don’t know if it’s possible but I saw a couple of websites doing it .

  First Website : Openaisearch.com
  This website simply gives a download link for the audio(getting it from youtube videos). I searched for a song and saw the download url, it looked something like this :

  https://redirector.googlevideo.com/videoplayback?source=youtube&requiressl=yes&clen=3814013&upn=dzwY9aUVYME&lmt=1469875393441562&expire=1484854959&mime=audio%2Fmp4&nh=IgpwcjAxLnNlYTA5Kg01Mi45NS4yMTYuMTAy&itag=140........... 

  I believe that this is not done by first downloading and converting the video to audio format(Correct me if I am wrong).
  Although the file which gets downloaded after using this link is without any extension, but adding ".m4a" at the end of downloaded file does the work.

  Second Website : http://keepvid.com/ ?url=https ://www.youtube.com/watch?v=PT2_F-1esPk

  Again similar website with similar audio link. You can check by visiting the URL and see link of audio files.

  Any idea how these websites get that "googlevideo.com" link ? Do they scrap the youtube video links or something ?

  Thanks.