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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.

• Streaming to YouTube from DJI-SDK [on hold]

  31 janvier 2018, par d0n13

  I’m trying to figure out how to take the camera frames in the DJI-SDK and push them to some form of encode so that I can create a live stream for YouTube.

  Has anybody got this working ? I understand most people use FFmpeg for streaming but my understanding is basic enough on how that project works.

  I’d love if somebody could share some resources on how we could go about getting this to work. I’ve seen the question on the web but I’ve found nothing that comes close to getting a solution for this.

  I need it for a project and there is a commercial solution available but it’s expensive and I can’t afford it and I’d be happy enough to code this if I can understand how to go about it and maybe get some help.

  I’d be happy enough to make an open source version of this is anyone can help.

  Thanks guys, hope we can make this...
  Donie

• Use FFMPEG to restream RTMP source to YouTube - no video stream in output

  5 février 2018, par Mike Miller

  I am attempting to grab the .m3u8 file from an nginx-rtmp server and pass it along to YouTube rtmp. I believe this to be possible (for example here : https://stackoverflow.com/a/11978820/1552594 although this is on the same host). The command I am using is :

  ffmpeg -analyzeduration 0 -i \
  
  http://source.rtmp.server/hls/stream.m3u8 -pix_fmt yuv420p \ 
  
  -f flv rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx

  However the output contains only audio and YouTube doesn’t like it. The command produces following :

  

  As you can see no Video stream in output metadata, stream mapping shows only audio and the trace shows 0kb of Video for 651kb of Audio

  Any help much appreciated

  MORE INFO

  Improved version of the command lifted from this article :

  https://judge2020.com/restreaming-a-m3u8-hls-stream-to-youtube-using-ffmpeg/

  "Restreaming a m3u8 HLS stream to Youtube using FFMPEG" AKA exactly what I am trying to do.

  The command I am sending is now :

  ffmpeg -re -i "http://source.rtmp.server/hls/stream.m3u8" \ 
  
  -strict -2 -c:v copy -c:a aac -ar 44100 -ab 128k -ac 2 -flags \ 
  
  +global_header -bsf:a aac_adtstoasc -bufsize 3000k -f flv \ 
  
  "rtmp://a.rtmp.youtube.com/live2/xxx-xxxx-xxxx-xxxx"

  I got pretty much exactly the same response except with the Audio being read and output using aac codec.

  

  MORE MORE INFO

  I have found that adding a mapping can force the video stream into the output :

  ffmpeg -re -i "http://source.rtmp.server/hls/stream.m3u8" \
  
  -strict -2 -c:v copy -c:a -map 0:0 -map 0:1 -ar 44100 -ab 128k -ac 2 \ 
  
  -flags +global_header -bsf:a aac_adtstoasc -bufsize 1000k \
  
  -f flv "rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx"

  This throws up the error that has presumably been resulting in the video stream being silently dropped :