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• Screen Recording Issues using Python and FFMPEG [closed]

  3 juin, par Kevin McDowell

  I am trying to record a walkthrough of a 3D space contained within a Chrome browser session. The goal is to create deterministic output. If I run this command from a VS Code terminal, it records 30 seconds of video from the window that's about 6MB :

  


  ffmpeg -f gdigrab -framerate 30 -i "title=My3D - Google Chrome" -t 30 "My3D - Google Chrome_screenRecording_v0.mp4"


  


  However, if I call it from Python like so :

  


  subprocess.run("ffmpeg -f gdigrab -framerate 30 -i \"title=My3D - Google Chrome\" -t 15 \"My3D - Google Chrome_screenRecording_v0.mp4\"")


  


  The output video is 30 seconds, but while I can see the mouse moving on the screen, the image is all black and the filesize is only 94KB.

  


  This is on a Windows 11 machine with GPU acceleration disabled in the OS as well as in Chrome. I've also tried it with other web pages and those are also recorded black. Any ideas what is causing this or how to record the screen using Python ?

  


  I've got other alternatives working (using Selenium or PyGet to capture screenshots and then using the VideoWriter class from OpenCV to write them to a video file), but that has a limitation of only about 10 FPS and you can't control the recording time like you can with FFMPEG. If you screen capture for 30 seconds, the actual output may only be 12-18 seconds.

  


• FFMPEG command causing audio issues

  7 août 2018, par alan samuel

  I am converting multiple mp4 video to ts and then stitching it together.

  But this sometimes causes audio issues on my videos where the audio sounds like it was recorded with two mics at the same time causing loud sound.

  I can only reproduce it sometimes and I am still not sure why it’s doing that ? Can anyone help ?

  Here is how I am converting to ts from mp4. I have noticed that the longer the video gets, the audio gets worse and its also off by a couple of seconds.

  ffmpeg -i video1.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video1.ts
  
  
  
  ffmpeg -i video2.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video2.ts
  
  
  
  ffmpeg -i video3.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video3.ts

  and then I save these paths to a txt and call my stitching command like this

  ffmpeg -f concat -safe 0 -i list.txt -c copy -bsf:a aac_adtstoasc finalvideo.mp4

  Here is the complete output of the 4 videos

  C:\Users\Alan\Desktop\videos>ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -i video4.mp4
  
  ffmpeg version N-90433-g5b31dd1c6b Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 12.100 / 56. 12.100
  
    libavcodec     58. 15.100 / 58. 15.100
  
    libavformat    58. 10.100 / 58. 10.100
  
    libavdevice    58.  2.100 / 58.  2.100
  
    libavfilter     7. 13.100 /  7. 13.100
  
    libswscale      5.  0.102 /  5.  0.102
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:10.80, start: 0.000000, bitrate: 1034 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 879 kb/s, 4.17 fps, 4.17 tbr, 12800 tbn, 8.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 165 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:01.62, start: 0.000000, bitrate: 3208 kb/s
  
      Stream #1:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 3203 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'video3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:05.58, start: 0.000000, bitrate: 1954 kb/s
  
      Stream #2:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1805 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 166 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'video4.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:03.90, start: 0.000000, bitrate: 1746 kb/s
  
      Stream #3:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1744 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

• Using FFmpeg to Output Audio to Camera Error Issues [closed]

  27 septembre 2024, par crazyday

  I want to send audio to the camera via command, but it fails. Here is my command syntax.

  


  ffmpeg -re -i audio.wav -f lavfi -i anullsrc -c:v copy -c:a aac -strict experimental -f rtsp rtsp://xxxxx:xxxxx@192.168.1.108:554/stream

  


  The error message is as follows :

  


  [af#0:0 @ 0000018ab4046b80] Error sending frames to consumers: Invalid data found when processing input
[af#0:0 @ 0000018ab4046b80] Task finished with error code: -1094995529 (Invalid data found when processing input)
[af#0:0 @ 0000018ab4046b80] Terminating thread with return code -1094995529 (Invalid data found when processing input)
[out#0/rtsp @ 0000018ab406aa00] Nothing was written into output file, because at least one of its streams received no packets.```