WORKING:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'frag_bunny.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp42avc1iso5
  Duration: 00:01:00.19, start: 0.000000, bitrate: 734 kb/s
    Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 65 kb/s (default)
    Metadata:
      handler_name    : Bento4 Sound Handler
    Stream #0:1(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 640x360, 612 kb/s, 23.96 fps, 24 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      handler_name    : Bento4 Video Handler
    Stream #0:2(eng): Data: none (rtp  / 0x20707472), 45 kb/s (default)
    Metadata:
      handler_name    : Bento4 Hint Handler
    Stream #0:3(eng): Data: none (rtp  / 0x20707472), 5 kb/s (default)
    Metadata:
      handler_name    : Bento4 Hint Handler




NOT WORKING:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'n720_003.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.25.100
  Duration: 00:00:17.22, start: 0.000000, bitrate: 2410 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2281 kb/s, 24.03 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified