Recherche avancée

Sur d’autres sites (7555)

• How to add title screen to the video using ffmpeg ?

  25 mai 2019, par Rohan Patil

  I am making an story telling video application. In this application the videos which are basically interviews and footage provided by user are merged together, in addition to this the video title which is entered by user should also be merged with rest of the video. I am successfully able to make title video using the title and export it, But the problem occurs when i try to merge the title video with rest of the videos. My app crashes when i try to merge the title video with other videos. Below I have put two commands, first one is for making title video, and the second one is merging that title video with rest of the video. What I want is to merge the title video with other video and export it. Does anyone have any idea to do this ? Thank you !

  command = new String[]{"-f","lavfi","-i","color=c=black:s=1080x1920:d=0.5","-vf","drawtext=fontfile=/system/fonts/DroidSans.ttf:fontsize=45:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='hello world'",dest2.getAbsolutePath()}
  
  
  
  
  
  command2=new String[]{"-y","-i",dest2.getAbsolutePath(),"-i", originalpath1, "-i", originalpath2 ,"-strict", "experimental", "-filter_complex",
  
                              "[0:v]scale=1080x1920,setsar=1:1[v0];[1:v]scale=1080x1920,setsar=1:1[v1];[2:v]scale=1080x1920,setsar=1:1[v2];[v0][0:a][v1][1:a][v2][2:a] concat=n=3:v=1:a=1",
  
                              "-ab", "48000", "-ac", "2", "-ar", "22050", "-s", "1080x1920", "-vcodec", "libx264","-crf","27","-q","4","-preset", "ultrafast", dest.getAbsolutePath()};

• 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;
}


  


• ffmpeg - Overlay a text over an image

  1er mai 2020, par ark1974

  The following command line for encoding audio with an image works fine.

  



  ffmpeg -y -loop 1 -framerate 15 -i  "/storage/emulated/0/Download/Kites.jpg" -i "/storage/emulated/0/Download/myaudio.mp3"  -c:v libx264 -vf format=yuv420p -c:a aac -shortest "/storage/emulated/0/Download/Out.mp4"


  



  I want to overlay text over an image in the video frame. Based on this link, I added an overlay text like so. Since I want to use the default font, I skip the drawtext="fontfile=" command deliberately like so. But now no video frames are visible, not even the background image. How can I do it ? Thanks.

  



  ffmpeg -y -loop 1 -framerate 15 -i  "/storage/emulated/0/Download/Kites.jpg" -i "/storage/emulated/0/Download/myaudio.mp3"  -c:v libx264 -vf format=yuv420p -vf drawtext="text='Hello World': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2"   -c:a aac -shortest "/storage/emulated/0/Download/Out.mp4"