[FFmpeg-user] Trouble converting from DNxHD36 to h.264

[Media Mouth]

> On Jul 18, 2022, at 7:20 PM, Carl Zwanzig <cpz at tuunq.com> wrote:
> 
> On 7/18/2022 7:13 PM, Media Mouth wrote:
>> I'm running same version MacOS on a different machine across town, where
>> FFmpeg works just fine, so I'm curious what might be the cause of the
>> problem.
> Quite likely then a different version of ffmpeg. Please post the complete and unedited command output in an email message (not a screen grab).
> 
> (often that type of error is a colorspace mismatch)
> 
> z!


RE "different version of ffmpeg"
Yes, probably.

stdout:

ffmpeg -i 'input.mov' -strict -2 -b:v 8000K -vf format=yuv420p -c:a aac 'output.mov'
ffmpeg version 4.4.git Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --disable-x86asm
  libavutil      57. 27.100 / 57. 27.100
  libavcodec     59. 33.100 / 59. 33.100
  libavformat    59. 25.100 / 59. 25.100
  libavdevice    59.  6.100 / 59.  6.100
  libavfilter     8. 41.100 /  8. 41.100
  libswscale      6.  6.100 /  6.  6.100
  libswresample   4.  6.100 /  4.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    creation_time   : 2022-07-18T20:05:46.000000Z
    timecode        : 00:59:56:00
  Duration: 00:01:49.19, start: 0.000000, bitrate: 36279 kb/s
  Stream #0:0[0x1](eng): Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p(tv, bt709/unknown/unknown), 1920x1080, 36175 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 23976 tbn (default)
    Metadata:
      creation_time   : 2022-07-18T20:05:46.000000Z
      handler_name    : Apple Video Media Handler
      vendor_id       : AVID
      encoder         : DNxHD  709
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 89 kb/s (default)
    Metadata:
      creation_time   : 2022-07-18T20:05:46.000000Z
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2022-07-18T20:08:11.000000Z
      handler_name    : Time Code Media Handler
      timecode        : 00:59:56:00
Stream mapping:
  Stream #0:0 -> #0:0 (dnxhd (native) -> mpeg4 (native))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'output.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    timecode        : 00:59:56:00
    encoder         : Lavf59.25.100
  Stream #0:0(eng): Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 8000 kb/s, 24 fps, 12288 tbn (default)
    Metadata:
      creation_time   : 2022-07-18T20:05:46.000000Z
      handler_name    : Apple Video Media Handler
      vendor_id       : AVID
      encoder         : Lavc59.33.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/8000000 buffer size: 0 vbv_delay: N/A
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2022-07-18T20:05:46.000000Z
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.33.100 aac