misleading error message in dv muxer?

[Andrew-R]

Summary of the bug:
How to reproduce:

download dv-avi-test.avi from ​http://samples.mplayerhq.hu/avi/DV-type2/

I tried to un-wrap it to make raw dv stream for testing

/dev/shm/ffmpeg/ffmpeg -i  dv-avi-test.avi -c:v copy -an dv-test.dv
ffmpeg version N-112149-ga87a52ed0b Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration:
  libavutil      58. 36.101 / 58. 36.101
  libavcodec     60. 37.100 / 60. 37.100
  libavformat    60. 20.100 / 60. 20.100
  libavdevice    60.  4.100 / 60.  4.100
  libavfilter     9. 17.100 /  9. 17.100
  libswscale      7.  6.100 /  7.  6.100
  libswresample   4. 13.100 /  4. 13.100
[avi @ 0xb2c3700] Switching to NI mode, due to poor interleaving
Input #0, avi, from 'dv-avi-test.avi':
  Duration: 00:04:53.09, start: 0.000000, bitrate: 286 kb/s
  Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], 28771 kb/s, 60k fps, 29.97 tbr, 60k tbn
  Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, dv, to 'dv-test.dv':
  Metadata:
    encoder         : Lavf60.20.100
  Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], q=2-31, 28771 kb/s, 60k fps, 29.97 tbr, 29.97 tbn
Press [q] to stop, [?] for help
[dv @ 0xb368a00] Unexpected frame size, 0 != 120000
[vost#0:0/copy @ 0xb3693c0] Error submitting a packet to the muxer: Function not implemented
    Last message repeated 1 times
[out#0/dv @ 0xb2c6a40] Error muxing a packet
[out#0/dv @ 0xb2c6a40] Task finished with error code: -38 (Function not implemented)
[out#0/dv @ 0xb2c6a40] Terminating thread with return code -38 (Function not implemented)
[out#0/dv @ 0xb2c6a40] video:10078kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
size=   10078kB time=00:00:02.90 bitrate=28440.5kbits/s speed= 190x
Conversion failed!

yet in fact (?) conversion worked, I see file

/dev/shm/ffmpeg/ffprobe dv-test.dv
ffprobe version N-112149-ga87a52ed0b Copyright (c) 2007-2024 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration:
  libavutil      58. 36.101 / 58. 36.101
  libavcodec     60. 37.100 / 60. 37.100
  libavformat    60. 20.100 / 60. 20.100
  libavdevice    60.  4.100 / 60.  4.100
  libavfilter     9. 17.100 /  9. 17.100
  libswscale      7.  6.100 /  7.  6.100
  libswresample   4. 13.100 /  4. 13.100
[dv @ 0xc1f4bc0] Estimating duration from bitrate, this may be inaccurate
Input #0, dv, from 'dv-test.dv':
  Metadata:
    timecode        : 00:00:00:00
  Duration: 00:00:02.87, start: 0.000000, bitrate: 28771 kb/s
  Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], 28771 kb/s, 60k fps, 29.97 tbr, 60k tbn
  Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s

If I try to make it encode audio, I get:

/dev/shm/ffmpeg/ffmpeg -i  dv-avi-test.avi -c:v copy -c:a pcm_s16be -af aresample=48000 dv-test.dv
ffmpeg version N-112149-ga87a52ed0b Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration:
  libavutil      58. 36.101 / 58. 36.101
  libavcodec     60. 37.100 / 60. 37.100
  libavformat    60. 20.100 / 60. 20.100
  libavdevice    60.  4.100 / 60.  4.100
  libavfilter     9. 17.100 /  9. 17.100
  libswscale      7.  6.100 /  7.  6.100
  libswresample   4. 13.100 /  4. 13.100
[avi @ 0xb48b700] Switching to NI mode, due to poor interleaving
Input #0, avi, from 'dv-avi-test.avi':
  Duration: 00:04:53.09, start: 0.000000, bitrate: 286 kb/s
  Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], 28771 kb/s, 60k fps, 29.97 tbr, 60k tbn
  Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> pcm_s16be (native))
Press [q] to stop, [?] for help
[dv @ 0xb530ac0] Can't initialize DV format!
Make sure that you supply exactly two streams:
     video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM
     (50Mbps allows an optional second audio stream)
[out#0/dv @ 0xb5309c0] Could not write header (incorrect codec parameters ?): Operation not permitted
[af#0:1 @ 0xb532b00] Error sending frames to consumers: Operation not permitted
[af#0:1 @ 0xb532b00] Task finished with error code: -1 (Operation not permitted)
[af#0:1 @ 0xb532b00] Terminating thread with return code -1 (Operation not permitted)
[out#0/dv @ 0xb5309c0] Nothing was written into output file, because at least one of its streams received no packets.
size=       0kB time=N/A bitrate=N/A speed=N/A
Conversion failed!

Note that example itself appear to be black frame.