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• Maximize FFMpeg performance

  23 octobre 2020, par Dude

  I'm trying to copy the video and convert the audio to EAC3 while dropping the subs, so I'm using this command

  


  E:\ffmpeg\ffmpeg.exe -y -i "E:\source.mkv" -map 0 -vcodec copy -threads 6 -sn -acodec eac3 -b:a 640k -metadata:s:a:0 title="EAC3 5.1" "E:\destination.mkv"


  


  but on my Windows 10 6-core i7 (3.5GHz) it's only outputting an average of 13x, 295 FPS, while CPU utilization is at 15%. How can this be improved so I can get closer to 100% CPU utilization ?

  


• ffmpeg tee muxer including subtitle stream in only one output

  11 juin 2022, par mafiosnik

  I'm currently using ffmpeg's tee muxer to simultaneously stream to HLS and save locally to my disk in an mkv container. (the HLS stream is being used as a preview in my Electron application.)

  


  This is the command I'm using and so far it's working perfectly well except for subtitles :

  


  ffmpeg -y -loglevel error -i subs.ass -c:s mov_text -i pipe: -c:v libx264 -preset medium -pix_fmt yuv420p -crf 18 -i audio.mka -b:a 256k -c:a aac -aac_coder twoloop -g 1 -f tee -map 0:v:0 -map 2:a:0 -flags +global_header "output.mkv|[f=hls: hls_list_size=0:hls_flags=independent_segments:hls_time=0.5:hls_segment_type=mpegts:hls_segment_filename=tmp/data%02d.ts]tmp/master.m3u8"

  


  Unfortunately it does not include any subtitle stream in both outputs when it finishes.
I tried mapping the subtitle stream with -map 1:s:0 but it immediately complains with this error :
Automatic encoder selection failed for output stream #0:2. Default encoder for format tee (codec none) is probably disabled. Please choose an encoder manually.

  


  I guess this is because HLS doesn't support encoding any subtitles. I also tried using [select=\'=0:v:0,2:a:0,1:s:0\'] for the mkv and [select=\'=0:v:0,2:a:0\'] for the hls stream, because i only need the subtitles in the mkv file, but I still get the same error, even though ffmpeg shouldn't try to include the subtitle stream on the hls output.

  


  Any ideas how to fix that ?

  


  EDIT : Fixed it like that :
ffmpeg -y -loglevel error -i pipe: -i subs.ass -c:s mov_text -i audio.mka -c:a copy -c:v libx264 -preset medium -pix_fmt yuv420p -crf 18 -g 1 -f tee -map 0:v:0 -map 2:a:0 -map 1:s:0 -c:s copy -flags +global_header "output.mkv|[select=\\'v,a\\':f=hls: hls_list_size=0:hls_flags=independent_segments:hls_time=0.5:hls_segment_type=mpegts:hls_segment_filename=tmp/data%02d.ts]tmp/master.m3u8"

  


• Why A .FLAC File Converted by FFMPEG Cause File Explorer Unresponse on Windows 10 [closed]

  20 juillet 2022, par Alex King

  My File Explorer Always showing "Working on it."
I've tried many resolutions.
First,I disconnect my NAS drive. seems fine.
I test many times on diffirient windows 10/11 versions.
I thought it was SMB problem on windows. But i was wrong.

  


  Today I'm using FFMPEG convert .wav to .flac.

  


  .\ffmpeg.exe -i $Source -c:a flac $Dest 


  


  Just simple like this. Blow my computer up.

  


  Even worse, explorer.exe crash after I'm trying to open FF output folder.

  


  It's not the poblem from "Quick access" or "Search Index".

  


  I'm now 100% percent confirm the flac files that ffmpeg made will cause file explorer crash.

  


  I can't solve it without knowing the reason.

  


  Might related to audio file tag vorbis ?

  


  This is my FFMPEG info

  


  ffmpeg version n5.0.1-4-ga5ebb3d25e-20220428 Copyright (c) 2000-2022 the FFmpeg developers

built with gcc 11.2.0 (crosstool-NG 1.24.0.533_681aaef)