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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"

  


• How to use LivuLib with Xcode project

  13 avril 2015, par Vishal Lohia

  I need to publish the live video from iphone camera to wowza server. During search I found, that this might be possible with LivuLib library. But don’t know how to use this. Anyone have any idea on this or other alternative way to achieve this.

  Thanks in advance..