output.txt

$ ffmpeg -i "Efficient-Searches-and-Shortcuts-1-SD-480p.mov" "Efficient-Searches-and-Shortcuts-1-SD-480p.webm"

ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.37)
  configuration: 
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa68900be00] stream 0, timescale not set
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Efficient-Searches-and-Shortcuts-1-SD-480p.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2022-01-03T11:55:45.000000Z
    keywords        : iMovie
    title           : Efficient Searches and Shortcuts - 1
    com.apple.quicktime.author: 
    com.apple.quicktime.keywords: iMovie
    com.apple.quicktime.displayname: Efficient Searches and Shortcuts - 1
    com.apple.quicktime.title: Efficient Searches and Shortcuts - 1
    com.apple.quicktime.description: This video is about Efficient Searches and Shortcuts - 1
  Duration: 00:25:21.54, start: -0.001333, bitrate: 1046 kb/s
    Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 110 kb/s (default)
    Metadata:
      creation_time   : 2022-01-03T11:55:45.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 640x360, 927 kb/s, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 60k tbn, 120k tbc (default)
    Metadata:
      creation_time   : 2022-01-03T11:55:45.000000Z
      handler_name    : Core Media Data Handler
      encoder         : H.264
      timecode        : 00:00:00;00
    Stream #0:2(und): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2022-01-03T11:55:45.000000Z
      handler_name    : Core Media Data Handler
      timecode        : 00:00:00;00
    Stream #0:3: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x360 [SAR 72:72 DAR 16:9], 90k tbr, 90k tbn, 90k tbc
Automatic encoder selection failed for output stream #0:0. Default encoder for format webm (codec vp8) is probably disabled. Please choose an encoder manually.
Error selecting an encoder for stream 0:0