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• ffmpeg, dash manifest cannot be created due to unspecified pixel format

  24 septembre 2015, par artworkad シ

  I am using ffmpeg 2.8 on OSX.

  I try to convert a short mp4 video to webm for adaptive streaming like suggested here http://wiki.webmproject.org/adaptive-streaming/instructions-to-playback-adaptive-webm-using-dash like this :

  VP9_DASH_PARAMS="-tile-columns 6 -frame-parallel 1"
  
  
  
  ffmpeg -i t2.mp4 -c:v libvpx-vp9 -s 160x90 -b:v 250k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1 video_160x90_250k.webm
  
  ffmpeg -i t2.mp4 -c:a libvorbis -b:a 128k -vn -f webm -dash 1 audio_128k.webm
  
  
  
  ffmpeg \
  
   -f webm_dash_manifest -i video_160x90_250k.webm \
  
   -f webm_dash_manifest -i audio_128k.webm \
  
   -c copy -map 0 -map 1 \
  
   -f webm_dash_manifest \
  
   -adaptation_sets "id=0,streams=0 id=1,streams=1" \
  
   manifest.mpd

  However this gives me a warning unspecified pixel format :

  [webm_dash_manifest @ 0x7f9414812800] Could not find codec parameters for stream 0 (Video: vp9, none, 160x90): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  video_160x90_250k.webm: could not find codec parameters
  
  Input #0, webm_dash_manifest, from 'video_160x90_250k.webm':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
    Duration: 00:00:09.97, bitrate: 111 kb/s
  
      Stream #0:0: Video: vp9, none, 160x90, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        webm_dash_manifest_duration: 9969
  
        webm_dash_manifest_initialization_range: 437
  
        webm_dash_manifest_file_name: video_160x90_250k.webm
  
        webm_dash_manifest_track_number: 1
  
        webm_dash_manifest_cues_start: 139297
  
        webm_dash_manifest_cues_end: 139399
  
        webm_dash_manifest_bandwidth: 99164
  
        webm_dash_manifest_cluster_keyframe: 1
  
        webm_dash_manifest_cue_timestamps: 0,2085,4171,6256,8342
  
  Input #1, webm_dash_manifest, from 'audio_128k.webm':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
    Duration: 00:00:10.01, bitrate: 120 kb/s
  
      Stream #1:0: Audio: vorbis, 48000 Hz, stereo, fltp (default)
  
      Metadata:
  
        webm_dash_manifest_duration: 10009
  
        webm_dash_manifest_initialization_range: 4697
  
        webm_dash_manifest_file_name: audio_128k.webm
  
        webm_dash_manifest_track_number: 1
  
        webm_dash_manifest_cues_start: 151174
  
        webm_dash_manifest_cues_end: 151240
  
        webm_dash_manifest_bandwidth: 105517
  
        webm_dash_manifest_cluster_keyframe: 1
  
        webm_dash_manifest_cue_timestamps: 0,4999,9998
  
  Output #0, webm_dash_manifest, to 'manifest.mpd':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #0:0: Video: vp9, none, 160x90 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        webm_dash_manifest_duration: 9969
  
        webm_dash_manifest_initialization_range: 437
  
        webm_dash_manifest_file_name: video_160x90_250k.webm
  
        webm_dash_manifest_track_number: 1
  
        webm_dash_manifest_cues_start: 139297
  
        webm_dash_manifest_cues_end: 139399
  
        webm_dash_manifest_bandwidth: 99164
  
        webm_dash_manifest_cluster_keyframe: 1
  
        webm_dash_manifest_cue_timestamps: 0,2085,4171,6256,8342
  
      Stream #0:1: Video: vorbis, none, q=2-31, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        webm_dash_manifest_duration: 10009
  
        webm_dash_manifest_initialization_range: 4697
  
        webm_dash_manifest_file_name: audio_128k.webm
  
        webm_dash_manifest_track_number: 1
  
        webm_dash_manifest_cues_start: 151174
  
        webm_dash_manifest_cues_end: 151240
  
        webm_dash_manifest_bandwidth: 105517
  
        webm_dash_manifest_cluster_keyframe: 1
  
        webm_dash_manifest_cue_timestamps: 0,4999,9998
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A    
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  Nevertheless the manifest file is created. I tried to specify the pixel format :

  -pix_fmt yuv420p

  However this did not change anything. The warning remains the same.

  Any ideas why the warning appears and how to fix this ?

• Playing 'aes-256-ctr' encrypted DASH stream with FFMPEG/FFPLAY

  9 mars 2020, par michalSolarz

  I try to play that stream with following command ffplay  -allowed_extensions ALL -loglevel debug -decryption_key "***" -encryption_scheme aes-256-ctr  https://*** but I receive following output :

   Error when loading first fragment, playlist 0
  
  [AVIOContext @ 0x7f6a60647600] Statistics: 55123 bytes read, 0 seeks
  
  ****/stream.mpd: Invalid data found when processing input

  Is it possible to do it at all ?

• What does "dash" - mean as ffmpeg output filename

  26 août 2020, par DDS

  I'm trying to use ffmpeg with gnuplot to draw some audio spectra, I'm following this ffmpeg doc link.

  


  Now I'm asking what "dash" - means on this line right after -f data, it should be a filename : the last element of ffmpeg command should the output file but I have no files named - in the directory after running the command.

  


  ffmpeg -y -i in.wav -ac 1 -filter:a aresample=8000 -map 0:a -c:a pcm_s16le -f data - | gnuplot -p -e "plot 'code>

  


  I looked on ffmpeg docs but I didn't find anything.