вт, 16 янв. 2024 г., 23:30 Terje J. Hanssen <terjejhanssen@gmail.com>:

Den 16.01.2024 20:23, skrev Andrew Randrianasulu:

https://trac.ffmpeg.org/ticket/1258

see attached to this ticket  modded decoder ...

I wonder if Terje's audio really 4ch? if so,may be we can decode it to 4* wav first, then encode them correctly to bluray lpcm / dvd pcm / ac3 ...

I did leave out some "empty channels" to simplify and clean up the post. Here are the full ffprobe output for the HDV source (mediainfo was complete):

well, this ticket still open, so ffmpeg tools do not know yet about this .. extension? It decodes in compat stereo mode. I attached fixed decoder to this ticket, it will be interesting if you just run ffmpeg acodec copy command and then compile and run decoder on it .. it may decode to 4 files! But not sure how it all was arranged when it comes to microphones ...? Does camera contain 4 of them? or you were supposed to connect your own array?

• There is two types of HDV: HD1/720p (19 Mbps) and HD2/1080i /25 Mbps) and Canon's 1080p24.
• HD1 is recorded to DV tape using only the DV video segment. The PCM audio segment is open for future use.
• HD2 is recorded to DV tape using both the DV video segment and the PCM audio segment. A small Subcode (ITI) segment holds data such
• as timecode. Because no PCM audio segments are available, HD2 cannot carry record PCM audio.
• MPEG-1 Audio:
• Both HD1 and HD2 support two audio channels of audio signals that are digitized with a 48kHz at 16-bit quantization and compressed to
• 384kbps by MPEG-1 Audio Layer 2 encoding. ProHD adds two-channel PCM audio thus creating a format that can carry four independent
• channels of audio. (See Chapter 2 for an in-depth introduction to MPEG-1 audio.)

ffprobe -hide_banner hdv07_05.m2t
[mpeg2video @ 0x55d58a968340] Invalid frame dimensions 0x0.
    Last message repeated 7 times
[mpegts @ 0x55d58a93e580] Could not find codec parameters for stream 2 (Unknown: none ([160][0][0][0] / 0x00A0)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[mpegts @ 0x55d58a93e580] Could not find codec parameters for stream 3 (Unknown: none ([161][0][0][0] / 0x00A1)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mpegts, from 'hdv07_05.m2t':
  Duration: 00:06:58.27, start: 3276.528000, bitrate: 25626 kb/s
  Program 100
  Stream #0:0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Side data:
      cpb: bitrate max/min/avg: 25000000/0/0 buffer size: 7340032 vbv_delay: N/A
  Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 384 kb/s
  Stream #0:2[0x815]: Unknown: none ([160][0][0][0] / 0x00A0)
  Stream #0:3[0x811]: Unknown: none ([161][0][0][0] / 0x00A1)
Unsupported codec with id 0 for input stream 2
Unsupported codec with id 0 for input stream 3