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• Encode HEVC/H.265/HDR Video for YouTube from 10bit Pro-Res using FFmpeg

  30 janvier 2018, par Rodrigo Polo

  I want to have an HDR YouTube video published, my source file is either an Apple ProRes or DNxHR using a chroma subsamplig 4:4:4 or full RGB, both 10bit, so the original source file has all what is needed in order to be encoded into a 10bit 4:2:0 H.265/HEVC (HDR).

  I have followed some answers listed here, reviewed lots of different approaches, tried out many different commands without success, colors aren’t right when using only FFmpeg, to much red, when using only Adobe to encode into H.264 with the recommended settings on their support page, the results is darker, here are the commands I’ve using :

  I have tried this :

  ffmpeg \
  
  -i input.mov \
  
  -c:v libx265 \
  
  -tag:v hvc1 \
  
  -crf 21 \
  
  -preset fast \
  
  -pix_fmt yuv420p10le \
  
  -x265-params "colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc:master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,10):max-cll=1000,400" \
  
  -c:a libfdk_aac \
  
  -b:a 128k \
  
  -ac 2 \
  
  -ar 44100 \
  
  -movflags +faststart \
  
  output.mp4

  And this :

  ffmpeg \
  
  -y \
  
  -hide_banner \
  
  -i input.mov \
  
  -pix_fmt yuv420p10le \
  
  -vf "scale=out_color_matrix=bt2020:out_h_chr_pos=0:out_v_chr_pos=0,format=yuv420p10" \
  
  -c:v libx265 \
  
  -tag:v hvc1 \
  
  -crf 21 \
  
  -preset fast \
  
  -x265-params 'crf=12:colorprim=bt2020:transfer=smpte-st-2084:colormatrix=bt2020nc:master-display="G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)":max-cll="1000,400"' \
  
  -c:a libfdk_aac \
  
  -b:a 128k \
  
  -ac 2 \
  
  -ar 44100 \
  
  -movflags +faststart \
  
  output.mp4

  I have also tried using MKVToolNix in order to insert the metadata into the encoded HEVC/H.265 file with the following command :

  /Applications/MKVToolNix-9.7.1.app/Contents/MacOS/mkvmerge \
  
  -o output.mkv \
  
  --colour-matrix 0:9 \
  
  --colour-range 0:1 \
  
  --colour-transfer-characteristics 0:16 \
  
  --colour-primaries 0:9 \
  
  --max-content-light 0:1000 \
  
  --max-frame-light 0:300 \
  
  --max-luminance 0:1000 \
  
  --min-luminance 0:0.01 \
  
  --chromaticity-coordinates 0:0.68,0.32,0.265,0.690,0.15,0.06 \
  
  --white-colour-coordinates 0:0.3127,0.3290 \
  
  input.mp4

  But the result is the same and YouTube don’t recognize the file as an HDR file, it does only with the first FFmpeg command and with the file encoded with Adobe Premiere, but the colors don’t look well, so, maybe I’m getting some concept wrong, thanks for your help.

• FFmpeg Loop Streaming

  21 septembre 2022, par Dan

  I'm trying to run a stream on YouTube with a video that loops 24/7, using FFmpeg 4.4 from a server with Ubuntu 22, it works but I'm loosing the "Live" red light on YouTube, and here is the message from the "Stream health" tab :

  


  "YouTube is not currently receiving data for this stream. If you believe this is incorrect, ensure you’re sending a stream and that it is configured with the correct stream key."

  


  Here's the script I made :

  


  
VBR="1500k" 
FPS="24" 
QUAL="superfast" 

YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2" 
SOURCE="/home/ubuntu/Video.mp4" 
KEY="mykey" 
ffmpeg \
-stream_loop -1 -i "$SOURCE" -deinterlace \
-vcodec libx264 -pix_fmt yuv420p -preset $QUAL -r $FPS -g $(($FPS * 2)) -b:v $VBR \
-acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k \
-f flv "$YOUTUBE_URL/$KEY"


  


  Any help would be appreciated.
Thanks.

  


• VLC/ffplay can't read some audiotracks created by ffmpeg

  19 juin 2021, par skanarr

  I have two different .mkv files of the same movie. One contains the English, German, Italian, Spanish and French audio and subtitle tracks, the other contains Japanese Audio and Subtitle tracks. Since I want to have all tracks in one file I tried to 'merge' them using :

  


  $ ffmpeg -i "Assassin's Creed (2016).mkv" -i "./Other/Assassin's Creed_t13.mkv" -map 0:v -map 0:a -map 1:a:2 -map 0:s -map 1:s:1 -map 1:s:2 -map 1:s:3 -c:v copy -c:s copy -c:a copy tmp2.mkv


  


  Full Command Output from ffmpeg

  


  However playing it in VLC none of the Tracks from ./Other/Assassin's Creed_t13.mkv are working properly.
There are short periods where there is audio and then it is gone again for some minutes.
Also tmp2.mkv freezes at 4:44 and freezes VLC for some time, before only audio continues top play.
Looking under Messages this is what I got : All Message from VLC
(Messages were set to display warnings and errors)

  


  I don't know what I did wrong. The Japanese tracks are working in ./Other/Assassin's Creed_t13.mkv.
The all non-japanese Tracks are still working in tmp2.mkv.
Also there are working Tracks with the same codecs on tmp2.mkv (dts) as well as subtitles (pgs).

  


  I then tried playing it with ffplay and got the same result.
Whenever i switched the audiotrack to stream 7 (the japanese audio)
It said non A-V: non in the little progress bar instead of the usual numbers.