Den 16.01.2024 21:35, skrev Andrew
Randrianasulu:
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?
Well, I think Steve Mullen's handbook for Sony FX7 (mine) and V1
clarify there is only two audo channels on my FX7::
- 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.)