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• How do I alter my FFMPEG command to make my HTTP Live Streams more efficient ?

  11 juillet 2019, par Robert

  I want to reduce the muxing overhead when creating .ts files using FFMPEG.

  Im using FFMPEG to create a series of transport stream files used for HTTP live streaming.

  ./ffmpeg -i myInputFile.ismv \
  
           -vcodec copy \
  
           -acodec copy \
  
           -bsf h264_mp4toannexb \
  
           -map 0 \
  
           -f segment \
  
           -segment_time 10\
  
           -segment_list_size 999999 \
  
           -segment_list output/myVarientPlaylist.m3u8 \
  
           -segment_format mpegts \
  
           output/myAudioVideoFile-%04d.ts

  My input is in ismv format and contains a video and audio stream :

  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x240, 348 kb/s, 29.97 tbr, 10000k tbn, 59.94 tbc
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 63 kb/s

  There is an issues related to muxing that is causing a large amout of overhead to be added to the streams. This is how the issue was described to me for the audio :

  

  So for a given aac stream, the overhead will be 88% (since 200 bytes will map to 2 x 188 byte packets).

  For video, the iframe packets are quite large, so they translate nicely into .ts packets, however, the diffs can be as small as an audio packet, therefore they suffer from the same issue.

  The solution is to combine several aac packets into one larger stream before packaging them into .ts. Is this possible out of the box with FFMPEG ?

• Video from images to mp4 in nvidia GPU

  16 août 2019, par M.y

  I am trying to encode a h264 .mp4 video created from .jpg images using a 1070ti nvidia cuda power, having a a crossfade transition between each image.
  I am able to render the video in GPU using the flags -c:v h264_nvenc, I see a short peak in the GPU encoding, but with a long period of computer CPU hight load, I guess preparing the transitioning images. But the image preparation it happens on cpu/ram due the -filter_complex and is quite slow.
  This works :

  ffmpeg.exe, -y, -loop, 1, -t, 2.5, -i, 1565957420594_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565957453659_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565957487743_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565957525280_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565957587308_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565957644898_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565957859119_labeled.jpg, -loop, 1, -t, 2.5, -i,1565959133561_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565959412948_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565959501884_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565959755432_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565959882380_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565960023185_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565960157174_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565960683303_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565961151548_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565961230278_labeled.jpg, -loop, 1, -t, 2.5, -i, 1565961671766_labeled.jpg, -loop, 1, -t, 2.5, -i, final.jpg, -loop, 1, -t, 2.5, -i, final.jpg, -c:v, h264_nvenc, -preset, fast, -filter_complex, [1]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+0.5/TB[f0];[2]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+1.0/TB[f1];[3]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+1.5/TB[f2];[4]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+2.0/TB[f3];[5]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+2.5/TB[f4];[6]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+3.0/TB[f5];[7]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+3.5/TB[f6];[8]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+4.0/TB[f7];[9]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+4.5/TB[f8];[10]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+5.0/TB[f9];[11]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+5.5/TB[f10];[12]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+6.0/TB[f11];[13]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+6.5/TB[f12];[14]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+7.0/TB[f13];[15]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+7.5/TB[f14];[16]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+8.0/TB[f15];[17]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+8.5/TB[f16];[18]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+9.0/TB[f17];[19]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+9.5/TB[f18];[0][f0]overlay[bg1];[bg1][f1]overlay[bg2];[bg2][f2]overlay[bg3];[bg3][f3]overlay[bg4];[bg4][f4]overlay[bg5];[bg5][f5]overlay[bg6];[bg6][f6]overlay[bg7];[bg7][f7]overlay[bg8];[bg8][f8]overlay[bg9];[bg9][f9]overlay[bg10];[bg10][f10]overlay[bg11];[bg11][f11]overlay[bg12];[bg12][f12]overlay[bg13];[bg13][f13]overlay[bg14];[bg14][f14]overlay[bg15];[bg15][f15]overlay[bg16];[bg16][f16]overlay[bg17];[bg17][f17]overlay[bg18];[bg18][f18]overlay[v], -map, [v], -movflags, +faststart, output.mp4

  I am trying to do all work in the GPU, theoretically I can encode all images in GPU memory using in each -i the flags "-hwaccel cuvid -c:v mjpeg_cuvid" I receive the following error :

  [mjpeg_cuvid @ 00000000024ef980] ignoring invalid SAR: 0/0
  
  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 1:0' and the filter 'auto_scaler_0'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Function not implemented
  
  Error while processing the decoded data for stream #0:0

  Is there a way to load images in the GPU with the "fade" flag applied ?

  Thanks in advance !

• FFMPEG tee muxer giving "Output file #0 does not contain any stream"

  31 août 2020, par Giorgi Aptsiauri

  I am trying to create two streams : one is mpegts UDP stream another - rtmp to Twitch servers.

  


  This command works :

  


    ffmpeg -threads:v 2 -threads:a 16 -filter_threads 2 -thread_queue_size 16 -y \
 -f dshow -video_size 1920x1080 -pixel_format uyvy422 -framerate 25 -rtbufsize 500M -i video="Decklink Video Capture" \
 -f dshow -rtbufsize 100M -i audio="Decklink Audio Capture" \
 -preset ultrafast -c:v libx264 -tune zerolatency -b:v 900k -map 0:v:0 -f mpegts udp://127.0.0.1:5555 \ 
 -pix_fmt yuv420p -c:v libx264 -crf 20 -tune zerolatency -f flv rtmp://live-fra05.twitch.tv/app/stream_key


  


  But it requires double the encoding CPU power.

  


  So, following this, I rewrote the command like this :

  


  ffmpeg -threads:v 2 -threads:a 16 -filter_threads 2 -thread_queue_size 16 -y \
 -f dshow -video_size 1920x1080 -pixel_format uyvy422 -framerate 25 -rtbufsize 500M -i video="Decklink Video Capture" \
 -f dshow -rtbufsize 100M -i audio="Decklink Audio Capture" \
 -preset ultrafast -c:v libx264 -tune zerolatency -b:v 900k \
 -f tee "[select=\'0:v:0\':f=mpegts]udp://127.0.0.1:5555|[select=\'0:v:0,1:a:0\':f=flv]rtmp://live-fra05.twitch.tv/app/stream_key"


  


  By writing -f tee "[select=\'0:v:0\':f=mpegts]udp://127.0.0.1:5555|[select=\'0:v:0,1:a:0\':f=flv]rtmp://live-fra05.twitch.tv/app/stream_key", I mean :

  


  

  • create UDP stream at udp ://127.0.0.1:5555 and only include video stream from "Decklink Video Capture"

  


  • create RTMP stream where we include the same video stream as above and also the audio stream from "Decklink Audio Capture"

  


  


  I get the error message :

  


  Output file #0 does not contain any stream


  


  How do I fix this ? I assume I made a mistake in the command.