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• Issue in installing ffmpeg on macOS 10.11

  20 août 2019, par Ravi barale

  I am installing ffmpeg on macOS 10.11. using following command,

  brew install ffmpeg

  but always getting following error.

  Error: An exception occurred within a child process:
  
    ChecksumMismatchError: SHA256 mismatch
  
  Expected: 3b1634fa348c0f0064e43f3fb673e30a5e46f2b51cd6cd0d4a0cbf326e71c90e
  
    Actual: 34480b13120e2167060795060b6738c26622c341498cf6303b17b143642b14cd
  
   Archive: /Users/RackMini5/Library/Caches/Homebrew/downloads/0c113ab0098bc4c3f2e8f410741b6104f2928fe63eb38cf98f8dcc3362f02ac4--ef80617d1e17e0878a909baad62a75ba265c0e00.patch
  
  To retry an incomplete download, remove the file above.

  What I am missing or what is cause of this issue. Any one know the solution for this issue.

• Adding audio into mp4 file with ffmpeg [on hold]

  18 avril 2015, par minto

  I want embed audio in .MP4 video file. Video does not contain any audio.

  MP3 audio track may be shorten or longer than actual MP4 video lenght, so I want loop audio when I will use shorter audio track, or truncate it when audio track is longer than video. Looping audio isn’t so important, though.

  How to make this correctly with ffmpeg ?

• FFmpeg - Past Duration Too Large

  14 avril 2018, par Nimble

  I’m having an issue with the warning "Past Duration Too Large" being spammed in my console. There has been quite a bit of discussion about this "warning" online but I have yet to find an actual solution to get rid of it.

  Many just say silence your console, but then I can’t see my segments and other things like warnings, it’s really not a good solution. Another suggests using the fps filter but I have found it creates stutter in the end files...

  Very strangely for reasons completely unknown to me if I double the input framerate and then specify the actual framerate for the output file the warning disappears. Example :

  ffmpeg - y -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -video_size 3440x1440 -rtbufsize 2147.48M ^
  
  -framerate 200 -pixel_format nv12 -i video="Video (00 Pro Capture HDMI 4K+)":audio="SPDIF/ADAT (1+2) (RME Fireface UC)" ^
  
  -map 0:0,0:1 -map 0:1 -flags +cgop -force_key_frames expr:gte(t,n_forced*2) -c:v h264_nvenc -preset: llhp -pix_fmt nv12 ^
  
  -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M -c:a aac -ar 44100 -b:a 384k -ac 2 -r 100 ^
  
  -af "atrim=0.038, asetpts=PTS-STARTPTS, aresample=async=250" -vsync 1 -ss 00:00:01.096 -max_muxing_queue_size 9999 ^
  
  -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 C:\Users\djcim\Videos\PC\PC\PC%02d.ts

  As you can see I have -framerate on the input at 200 and -r on the output at 100, believe it or not this gets rid of the warning completely and the resulting file has no issues. However... this is not something you can pull off with any capture card, the only reason I can do this with the Magewell is because under certain resolutions it can record 200fps. Therefore FFmpeg allows me to set it, even though it is double what the card actually allows at the resolution I’m recording. So when I record my camera with a card from Elgato I can’t pull that off :

  ffmpeg -y -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -video_size 1920x1080 -rtbufsize 2147.48M ^
  
  -framerate 60 -pixel_format yuyv422 -i video="Game Capture HD60 Pro (Video) (#01)":audio="ADAT (5+6) (RME Fireface UC)" ^
  
  -map 3:0,3:1 -map 3:1 -flags +cgop -r 60 -force_key_frames expr:gte(t,n_forced*2) -c:v h264_nvenc -preset: llhp ^
  
  -pix_fmt yuv420p -b:v 40M -minrate 40M -maxrate 40M -bufsize 40M -c:a aac -ar 44100 -b:a 384k -ac 2 ^
  
  -af "pan=mono|c0=c0, adelay=112|112, aresample=async=250" -vsync 1 -max_muxing_queue_size 9999 -f segment ^
  
  -segment_time 600 -segment_wrap 9 -reset_timestamps 1 C:\Users\djcim\Videos\PC\Camera\CPC%02d.ts 

  When I try to set the -framerate to 120 is just throws an error and wont start recording. Also, while I really wish I could just double the framerate and be done with it, it is pretty clear that that is not a conventional or "actual" solution. That really shouldn’t get rid of the message... The only solution I have come up with besides buying another Magewell is to modify the if statement in the code and compile FFmpeg myself.

  Also I’d like to mention that at times the message is spammed so much that it actually crashes the console, so it’s a real issue not just a warning...

  Any help would be appreciated.