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• Add 2 seconds of blank/black video with ffmpeg

  22 avril 2016, par user3076099

  Let’s say I have two videos I want play simultaneously. movieA.mp4 is 38.6 seconds duration, and movieB.mp4 is 31.14 seconds duration. Using ffmpeg is there an easy way to fill the end of movieB.mp4 with black silence so that it is exactly 38.6 seconds (matching movieA.mp4). There’s a very niche technical reason I want to do this, so don’t ask haha !!

  Also if possible, but less important, a way to remove this afterwards.

  Been searching for 2 days for any sort of easy way around this without luck !!!

  Thanks so much in advance !

• WebRTC Video Track to ffmpeg in Node

  15 mai 2021, par Marcos López

  I have succesfully managed to establish a WebRTC connection between Node (server) and a browser. Server gets the video track on onTrack callback inside the RTCPeerConnection. Is there any way I can potentially convert the video track and make it work on ffmpeg so I can output it to rtmp.

  


  Thanks in advance.

  


• 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;
}