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• Getting error while streaming with ffmpeg

  30 novembre 2019, par Tirtha

  I am trying to stream with ffmpeg. Video source is vmix. While streaming ffmpeg throws i/o error and stops.
  Available Devices :

  [dshow @ 0000028c44498ec0] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 0000028c44498ec0]  "e2eSoft VCam"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_pnp_\\?\root#image#0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 0000028c44498ec0]  "HP Truevision HD"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_pnp_\\?\usb#vid_04f2&pid_b50d&mi_00#6&2557162&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 0000028c44498ec0]  "vMix Video"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{8E14549A-DB61-4309-AFA1-3578E927E938}"
  
  [dshow @ 0000028c44498ec0]  "vMix Video External 2"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{8E14549A-DB61-4309-AFA1-3578E927F974}"
  
  [dshow @ 0000028c44498ec0]  "vMix Video YV12"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{8E14549A-DB61-4309-AFA1-3578E927FF92}"
  
  [dshow @ 0000028c44498ec0] DirectShow audio devices
  
  [dshow @ 0000028c44498ec0]  "Microphone (Realtek High Definition Audio)"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{3522D665-FB21-41E0-AF83-CC3432431D30}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E940}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - Bus A"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E944}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - Bus B"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E948}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - M A B"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E952}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - M A"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E956}"
  
  [dshow @ 0000028c44498ec0]  "CABLE Output (VB-Audio Virtual Cable)"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{D27F382E-4EA5-49D0-8F87-2B5F144BC155}"

  I tried to stream using the command as :

  ffmpeg -re -rtbufsize 1024M -framerate 25 -f dshow -video_size 1280x720 -channels 2 -i video="vMix Video":audio="vMix Audio" -c:v libx264 -pix_fmt yuv420p -g 50 -crf 20 -profile:v high -preset:v veryfast -tune film -c:a libfaac -b:a 256k -f mp4 "D:\recordedfile.mp4"

  Getting error as :

  [dshow @ 0000028144d4c7c0] Could not set video options
  
  video=vMix Video:audio=vMix Audio: I/O error

  Video interface works fine if i use other tools like gstreamer but its not working with ffmpeg. Please suggest where I am wrong or what I am missing ? I am using windows OS. Thank you for reading.

• stream mp4 file with ffmpeg from a specific time of video

  15 décembre 2019, par Reza Torkaman Ahmadi

  I Want to stream a video file (.mp4) from a differnt starting time.

  For example I want to stream test.mkv file from minute like 00:02:30 of test.mkv video.
  So when I stream it to rtmp server, the video is started from 00:02:30 of movie not start.
  Note : I don’t want to wait for that long, I want to start from that moment right after i pressed enter on ffmpeg command, So answers like using cronjob are not useful.

  Here is the ffmpeg command i’m using :

  ffmpeg -i test.mkv -pix_fmt yuv420p -vsync 1 -threads 0 -vcodec libx264 -r 30 -g 60 -sc_threshold 0 -b:v 512k -bufsize 640k -maxrate 640k -preset veryfast -profile:v baseline -tune film -acodec aac -b:a 128k -ac 2 -ar 48000 -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" -bsf:v h264_mp4toannexb -f flv rtmp://test.server.com

  Note :

  If you guys have any suggestions on improving ffmpeg commmand, also I appreciate it.

• HLS encoded video (ffmpeg) breaks in Safari when segmented via byte-range

  15 juin 2019, par eschie

  Some of my HLS encoded videos via ffmpeg drop the audio when seeking past the buffer. The only way to sync the audio and video up again is to restart the video. What would be causing this ?

  Example Profile :

  bitrate: 4800, profile: 'high', level: '4.1', resolution: 1080, framerate: '24000/1001'

  ffmpeg
  
      '-y' 
  
      '-i' input_file.mov                                                 
  
      '-v' error 
  
      '-map' '0:0'                                                        
  
      '-c:v' libx264                                                  
  
      '-x264opts' f'
  
          keyint=23:                  
  
          min-keyint=23:          
  
          no-scenecut                                                     
  
      '
  
      '-vf' f'scale=-1:1080'
  
      '-preset' 'slow'
  
      '-profile:v' 'high'
  
      '-level' '4.1'
  
      '-b:v' '4800k'
  
      '-maxrate' '4800k'
  
      '-movflags' 'faststart'
  
      '-bufsize' '9600k' 
  
      '-write_tmcd', '0'
  
      '-r' '24000/1001'                                   
  
      output_dir                                                      

  Segmentation CMD :

  FFMPEG 
  
      '-i' output_dir 
  
      '-v' 'error' 
  
      '-acodec' 'copy'
  
      '-vcodec' 'copy'
  
      '-hls_time' '4' #seconds
  
      '-hls_list_size' '0'
  
      '-hls_flags' 'single_file' 
  
      os.path.join(output_dir, f'{run_id}_{bitrate}.m3u8'

  Added : apple’s mediastreamvalidator outputs a few different errors :

  Error: Playlist vs segment duration mismatch
  
  --> Detail:  Segment duration 98.0146, Playlist duration: 4.7968
  
  --> Source:  1559962503399_2200k.m3u8 - 1559962503399_2200k.ts:1746520@0

  Error: Measured peak bitrate compared to master playlist declared value exceeds error tolerance
  
  --> Detail:  Measured: 3182.61 kb/s, Master playlist: 2173.82 kb/s, Error: 46.41%, Combined rendition name: English
  
  --> Source:  ...playlist.m3u8
  
  --> Compare: 1559962503399_2200k.m3u8

  Error: Different target durations detected
  
  --> Detail:  Target duration: 5 vs Target duration: 4
  
  --> Source:  1559962503399_64k.m3u8
  
  --> Compare: 1559962503399_128k.m3u8

  UPDATE 1 :
  I modified the encoding command to utilize tee pseudo-muxer, but it seems the same issue still exists when segmenting HLS as byte-ranges rather than in separate .ts files :

  $ ffmpeg
  
  -hide_banner
  
  -report
  
  -benchmark
  
  -vstats
  
  -i "../Jane_shallowing_Top_v08.mp4"
  
  -dn
  
  -sn
  
  -filter_complex "[0:v]fps=fps=24.000,setpts=(PTS-STARTPTS),split=[vsplit1][vsplit2];[vsplit1]scale=-1:144[video_144];[vsplit2]scale=-1:1080[video_1080]"
  
  -map "[video_144]"
  
  -r:v:0 "24.000"
  
  -c:v:0 "libx264"
  
  -x264-params "keyint=144:min-keyint=144:scenecut=0:open_gop=0"
  
  -preset:v:0 "slow"
  
  -profile:v:0 "baseline"
  
  -refs:v:0 "2"
  
  -b-pyramid:v:0 "strict"
  
  -tune:v:0 "film"
  
  -b:v:0 "96000"
  
  -maxrate:v:0 "56000"
  
  -bufsize:v:0 "6*56000/8"
  
  -vsync:v:0 "cfr"
  
  -bsf:v:0 "h264_metadata=fixed_frame_rate_flag=1"
  
  -map "[video_1080]"
  
  -r:v:1 "24.000"
  
  -c:v:1 "libx264"
  
  -x264-params "keyint=144:min-keyint=144:scenecut=0:open_gop=0"
  
  -preset:v:1 "slow"
  
  -profile:v:1 "high"
  
  -refs:v:1 "2"
  
  -b-pyramid:v:1 "strict"
  
  -tune:v:1 "film"
  
  -b:v:1 "4800000"
  
  -maxrate:v:1 "4800000"
  
  -bufsize:v:1 "6*4800000/8"
  
  -vsync:v:1 "cfr"
  
  -bsf:v:1 "h264_metadata=fixed_frame_rate_flag=1"
  
  -map a:0 -map a:0
  
  -c:a "libfdk_aac"
  
  -ar "48000"
  
  -ab "128k"
  
  -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0"
  
  -f "hls"
  
  -var_stream_map "v:1,a:0 v:0,a:1"
  
  -hls_time "6.000"
  
  -hls_segment_type "mpegts"
  
  -hls_flags "discont_start+temp_file+single_file"
  
  -hls_list_size "0"
  
  -master_pl_name "playlist.m3u8"
  
  -hls_segment_filename "out_%v.ts" "out_%v.m3u8" 

  Segment duration 98.0267, Playlist duration: 6.0000