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• Hardware for FFMPEG video encoding ? [migrated]

  12 février 2018, par CMOS

  So I am trying to find out what the best way to transcode using FFMPEG would be on a commercial scale. I currently just have very CPU heavy cloud instances that run FFMPEG with parameters set as a balance between speed and quality. However I am now looking into a long term solution that will allow me to really transcode hundreds of video files daily maybe a few dozen at one time. So I looked into GPU acceleration and it seems due to the way the compression algorithms are structured CPU is generally faster than GPU anyway (more on that here). So next up is dedicated hardware, is there some sort of dedicated h.264 / h.264 encoder I could get and physically install in my server that would make FFMPEG transcoding blazing fast ?

• how do I only output a single video stream per HLS output

  20 octobre 2018, par Marc Archenault

  I have successfully output 3 HLS output using -map 360, 720 & 1080p. My source file is 540p. once generated I use ffprobe on the newly created 360.ts, 720.ts, and 1080.ts and notice that there is a second video channel. This channel is the input video. How do I have FFmpeg not output the original video as part of the output ?

  this is the ffprobe on 360.ts

  Stream #0:0[0x100] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  Stream #0:10x101 : Audio : aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 100 kb/s
  Stream #0:2[0x102] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

  This is the FFmpeg command

  %ffmpeg% -loglevel fatal -threads %threads% -hide_banner -y -i %input% -i %overlayImg%^
  -filter_complex "[1]colorchannelmixer=aa=%thumbopacity%,scale=iw*%thumbscale% :-1[wm] ;[0:v][wm]overlay=(main_w-overlay_w)-36 :(main_h-overlay_h)-21,split=4[a][b][c][d] ;[a]scale=w=640:h=360:force_original_aspect_ratio=decrease[a] ;[b]scale=w=1280:h=720:force_original_aspect_ratio=decrease[b] ;[c]scale=w=1920:h=1080:force_original_aspect_ratio=decrease[c] ;[d]scale=w=1280:h=720:force_original_aspect_ratio=decrease[d]"^
  -map "[a]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_flags single_file^
  %output%\360p.m3u8^
  -map "[b]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -hls_flags single_file^
  %output%\720p.m3u8^
  -map "[c]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 5000k -maxrate 5350k -bufsize 7500k -b:a 192k -hls_flags single_file^
  %output%\1080p.m3u8^
  -map "[d]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -preset %preset%^
  %output%\720.mp4^
  -map 0:v -y -ss 0.5 -vframes 1 -s %thumbsize% -ss 30^
  %outputthumb%

  thank you.

• How to save movie from behind ? [on hold]

  16 mai 2017, par Nips

  I must convert my mp4 camera movie, to play it from behind. Is this possible in ffmpeg ?
  Or maybe html5 can play a movie from behind ?

  In a film I have closeup on the object, I must play it as move away from the object.