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• Revision 25655e5794 : Merge "First draft of vp9_short_idct32x32_add_neon."

  12 septembre 2013, par Christian Duvivier

  Merge "First draft of vp9_short_idct32x32_add_neon."

• Online Server with Local Storage + FFMPEG

  25 mars 2014, par user2876479

  I'm making a website that uses videos from local hard disk as well as online.

  The website will be online and all the infos are pulled from online server & online database. But videos are pulled from local harddisk if found locally, otherwise pulled from online server. Is this possible ?

  BTW, planning to host it in hostgator with normal account.

  Also, I'm converting high res videos into low res with ffmpeg using exec.

  Does anybody using this website has to install local server like wamp and ffmpeg in their local system to get all these features ?

  SORRY I'M NEW TO WEB DEVELOPMENT. MY QUESTIONS MAY BE FUNNY. BUT I'M LEARNING.

• ffmpeg avformat_open_input() failed to open a dshow device url containing Chinese Characters

  16 octobre 2024, par Sang

  The USB Webcam is OK, but the device I want to use is a "virtual camera" named "无他伴侣(竖屏)", whose video is from the smart phone like Android or iOS. Connect the phone to PC, run an app on the phone, then run a PC client application, which can preview the video. The phone app is called "无他相机", and the PC app is called "无他伴侣", its website is https://www.wuta-cam.com/.

  


  I run FFmpeg at the Windows Commandline with the command ffmpeg -list_devices true -f dshow -i dummy, it's OK to list the devices.(in order to display Chinese correctly, run chcp 65001 in advance.)

  


  Run the command ffplay -f dshow -i video="无他伴侣(竖屏)", it's OK to play the video.(of course you need to comfirm its PC client previewing fine in advance.)

  


  Now I want to get the decoded frames from that virtual camera in my program, I call avformat_open_input() with video=无他伴侣(竖屏), it failed, the return value is -5, I/O error.

  


  Anyone knows the reason ?

  


  Below is my code snippet.

  


  avdevice_register_all();
avcodec_register_all();
//const char * url= "video=Logitech Webcam C930e";// This is fine.
char url[] = "video=无他伴侣(竖屏)";// This is bad.

AVFormatContext *pFmtCtx = avformat_alloc_context();
AVInputFormat *iformat = av_find_input_format("dshow");
int nRet = 0;
nRet = avformat_open_input(&pFmtCtx, url, iformat, NULL);
if (nRet)
{
    const size_t buffer_size = 256;
    char err_description[buffer_size];
    av_strerror(nRet, err_description, buffer_size);
    printf("%s.\n", err_description);// --> I/O error.
    printf("FAILED to open input.(Line:%d,%d)\n",  __LINE__, nRet);
    return -1;
}