Den 16.01.2024 23:32, skrev Andrew Randrianasulu:
ср, 17 янв. 2024 г., 01:14 Andrew Randrianasulu <randrianas...@gmail.com>:
ср, 17 янв. 2024 г., 01:04 Andrew Randrianasulu
<randrianas...@gmail.com>:
ср, 17 янв. 2024 г., 00:42 Terje J. Hanssen
<terjejhans...@gmail.com>:
Den 16.01.2024 21:35, skrev Andrew Randrianasulu:
вт, 16 янв. 2024 г., 23:30 Terje J. Hanssen
<terjejhans...@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?
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.)
yeah, seems to be rarely supported on HDV cameras, see
https://forum.blackmagicdesign.com/viewtopic.php?f=33&t=171688
<https://forum.blackmagicdesign.com/viewtopic.php?f=33&t=171688>
but still!
https://ieba.wordpress.com/2008/01/21/hdv-grows-up-sonys-hvr-s270-and-hvr-z7/
=====
*4-Channel Audio*
The HDV specification, like the DV specification, has allowed for
four-channel audio recording from the outset. Few cameras took
advantage of it, and when they did, it was an add-on that did not
maintain full balanced audio throughout. Though the smaller Sony
HVR-Z7 records only two channels of audio, the larger HVR-S270 has
two XLR inputs in the front of the camcorder and two XLR inputs on
the back of the camcorder. Each one has a separate audio level
control and an automatic level control switch on the side of the
camcorder.
=====
and samples:
https://forum.doom9.org/archive/index.php/t-125966-p-46.html
=====
As you can see 4 channel audio is part of the HDV format. I am not
sure if there are actually 2 audiostreams or only 1. There is no way I
can check this because the camera itself only outputs the 4 ch and no
2 ch. But the computer will only play a 2 ch. But when you compare the
MediaInfo audio information with the specs I expect that there are 2
audio stream just like eac3to detects. It would be very very nice if
HDV support can be integrated into eac3to because many professional
cameramen are looking for an solution.
Currently eac3to extracts the m2v and 2ch audio stream fine. Only the
4 channel stream isn't detected nor extracted. I uploaded 2 sample to
my server for analysis:
http://tools.twanwintjes.nl/uploads/temp/00_0001_2010-11-07_153401.M2T
(49 seconds / 152MB) - Right Click --> Save As
http://tools.twanwintjes.nl/uploads/temp/00_0002_2010-11-07_214302.M2T
(44 seconds / 137MB) - Right Click --> Save As
====
yes, files still there :)
Yeah, I saw some of the forum threads and had a look on the sample files.
For me they the ffprobe outputs were identical with my own hdv.m2t files.
I think as Mullen wrote, the limit for miniDV or HDV tapes was utilized
for 1080i HD2 with 25 Mbps.
Only the 720p HD2 format with 19 Mbps had PCM tracs free for later use.
Maybe other camcorders..
Possibly file storage on other disc media could be utilized for larger
bandwidth.
But I cannot see it was mentioned for the targeted camcorder disc recorder
https://www.bhphotovideo.com/c/product/461819-REG/Sony_HVRDR60_HVRDR60_Hard_Disk_Recording.html
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
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