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• Superimpose video if different duration

  28 mars 2019, par Maxim_A

  I have 2 videos. I overlay one video over another with this code :

  
   stream_loop LoopCount -i 1.mp4 -c copy -y 2.mp4
  
   i 2.mp4 -i preresult.mp4 -filter_complex "[0:v][1:v]overlay=shortest=1[out]" -map "[out]" -y result.mp4
  

  LoopCount - this is a variable that stores the value of how many times the overlay video is longer than the original video.

  Please tell me how to combine these two commands in filter_complex so that ffmpeg can loop the overlay video as many times so that it matches the duration of the preresult.mp4 ?

  Thank you all !

• How can I display lots of subtitles at arbitrary positions in a video using ffmpeg ?

  25 septembre 2021, par cxrodgers

  I am trying to write subtitles and display them at lots of positions throughout a video at arbitrary positions. I have a long list of times and positions to display the text in the video, but I don't know how to encode these times and positions into the subtitles file. A lot of the examples on the web only show how to display a single subtitle, or don't explain the syntax of the subtitles files.

  


  I couldn't find a simple answer to how to do this, so I had to put together a lot of methods, and I'm going to answer my own question.

  


• cannot hear audio after saving RTSP stream as ts or avi or mp4 files using ffmpeg command

  28 mai 2022, par ewang

  I am still new to ffmpeg and trying to save RTSP stream from the IP camera (Meraki MV2) via RTSP link (rtsp ://192.168.0.80:9000/live) to local laptop (Windows 10) as ts file, or avi or mp4 files, but none of them can hear sound. In Meraki MV2 camera dashboard audio is enabled
meraki dashboard audio enabled screenshot

  


  And below is the ffmpeg command i used :

  


  ffmpeg -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i rtsp://192.168.0.80:9000/live -f mpegts -b 400k -r 25 -vcodec libx264 -s 640x480 -aspect 4:3 -bufsize 6000k -acodec aac -ab 56k -ac 2 -ar 22050 -bf 0 -level 30 -y record_a_v.ts


  


  In below part of the result log, noticed Steam mapping has a #0:1 -> #0:0 and #0:0 -> #0:1, is it supposed to be crossed or not really ?

  


  Input #0, rtsp, from 'rtsp://192.168.0.80:9000/live':
  Metadata:
    title           : www rtsp live
    comment         : LIVE555 Streaming Media v2017.01.26
  Duration: N/A, start: 1653723857.755958, bitrate: N/A
  Stream #0:0: Audio: aac (LC), 48000 Hz, mono, fltp
  Stream #0:1: Video: h264 (High), yuvj420p(pc, smpte170m, progressive), 1920x1080, 90k tbr, 90k tbn
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (aac (native) -> aac (native))


  


  Here are the last section of the result log :

  


      Last message repeated 4 times
Error while decoding stream #0:0: Invalid argument:00:09.44 bitrate=  79.3kbits/s dup=0 drop=2 speed=1.38x
    Last message repeated 1 times
[aac @ 0000027bec8ee780] Queue input is backward in time
Error while decoding stream #0:0: Invalid argument
[mpegts @ 0000027bee8cfac0] Non-monotonous DTS in output stream 0:1; previous: 868241, current: 867392; changing to 868242. This may result in incorrect timestamps in the output file.
Error while decoding stream #0:0: Invalid argument
    Last message repeated 12 times
Error while decoding stream #0:0: Invalid argument:00:09.90 bitrate= 111.7kbits/s dup=0 drop=2 speed=1.35x
    Last message repeated 6 times
Error while decoding stream #0:0: Invalid argument:00:10.51 bitrate= 121.5kbits/s dup=0 drop=2 speed=1.34x
    Last message repeated 19 times
Error while decoding stream #0:0: Invalid argument:00:11.01 bitrate= 137.9kbits/s dup=0 drop=2 speed=1.31x
    Last message repeated 10 times
Error while decoding stream #0:0: Invalid argument:00:11.51 bitrate= 145.2kbits/s dup=0 drop=2 speed=1.29x
    Last message repeated 9 times
Error while decoding stream #0:0: Invalid argument:00:12.12 bitrate= 154.5kbits/s dup=0 drop=2 speed=1.29x
    Last message repeated 21 times
Error while decoding stream #0:0: Invalid argument:00:12.50 bitrate= 167.7kbits/s dup=0 drop=2 speed=1.26x
    Last message repeated 8 times
Error while decoding stream #0:0: Invalid argument:00:13.08 bitrate= 160.2kbits/s dup=0 drop=2 speed=1.25x
    Last message repeated 11 times
Error while decoding stream #0:0: Invalid argument:00:13.61 bitrate= 154.0kbits/s dup=0 drop=2 speed=1.24x
    Last message repeated 8 times
Error while decoding stream #0:0: Invalid argument:00:14.11 bitrate= 148.5kbits/s dup=0 drop=2 speed=1.23x
    Last message repeated 16 times
Error while decoding stream #0:0: Invalid argument:00:14.61 bitrate= 143.5kbits/s dup=0 drop=2 speed=1.22x
    Last message repeated 10 times
Error while decoding stream #0:0: Invalid argument:00:15.14 bitrate= 138.4kbits/s dup=0 drop=2 speed=1.21x
    Last message repeated 18 times
Error while decoding stream #0:0: Invalid argument:00:15.62 bitrate= 134.2kbits/s dup=0 drop=2 speed= 1.2x
    Last message repeated 6 times
Error while decoding stream #0:0: Invalid argument:00:16.14 bitrate= 129.9kbits/s dup=0 drop=2 speed=1.19x
    Last message repeated 15 times
Error while decoding stream #0:0: Invalid argument:00:16.64 bitrate= 251.9kbits/s dup=0 drop=2 speed=1.19x
    Last message repeated 9 times
Error while decoding stream #0:0: Invalid argument:00:17.11 bitrate= 245.1kbits/s dup=0 drop=2 speed=1.18x
    Last message repeated 15 times
frame=  125 fps=8.3 q=27.0 size=     512kB time=00:00:17.66 bitrate= 237.5kbits/s dup=0 drop=2 speed=1.17x

[q] command received. Exiting.

frame=  125 fps=8.2 q=-1.0 Lsize=     922kB time=00:00:17.75 bitrate= 425.1kbits/s dup=0 drop=2 speed=1.16x
video:843kB audio:2kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.064729%
[libx264 @ 0000027bee8cd640] frame I:1     Avg QP:17.27  size: 54983
[libx264 @ 0000027bee8cd640] frame P:124   Avg QP:22.65  size:  6516
[libx264 @ 0000027bee8cd640] mb I  I16..4:  4.2% 60.5% 35.2%
[libx264 @ 0000027bee8cd640] mb P  I16..4:  0.1%  2.4%  0.4%  P16..4: 39.2% 11.9% 10.2%  0.0%  0.0%    skip:35.9%
[libx264 @ 0000027bee8cd640] 8x8 transform intra:77.2% inter:55.0%
[libx264 @ 0000027bee8cd640] coded y,uvDC,uvAC intra: 93.1% 91.5% 65.1% inter: 26.5% 37.1% 6.2%
[libx264 @ 0000027bee8cd640] i16 v,h,dc,p:  8%  2%  8% 81%
[libx264 @ 0000027bee8cd640] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11%  9% 24%  5% 16% 12% 12%  6%  6%
[libx264 @ 0000027bee8cd640] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25%  9% 16%  6% 11% 14%  6%  6%  6%
[libx264 @ 0000027bee8cd640] i8c dc,h,v,p: 64% 12% 20%  5%
[libx264 @ 0000027bee8cd640] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000027bee8cd640] ref P L0: 77.9% 10.9%  7.7%  3.5%
[libx264 @ 0000027bee8cd640] kb/s:435.85
[aac @ 0000027bec8ee780] Qavg: 65536.000


  


  Can anyone help checking where went wrong ? Thanks