<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">ср, 17 янв. 2024 г., 01:04 Andrew Randrianasulu <<a href="mailto:randrianasulu@gmail.com" target="_blank" rel="noreferrer">randrianasulu@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">ср, 17 янв. 2024 г., 00:42 Terje J. Hanssen <<a href="mailto:terjejhanssen@gmail.com" rel="noreferrer noreferrer" target="_blank">terjejhanssen@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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<div>Den 16.01.2024 21:35, skrev Andrew
Randrianasulu:<br>
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<div dir="ltr" class="gmail_attr">вт, 16 янв. 2024 г., 23:30
Terje J. Hanssen <<a href="mailto:terjejhanssen@gmail.com" rel="noreferrer noreferrer noreferrer" target="_blank">terjejhanssen@gmail.com</a>>:<br>
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<div>Den 16.01.2024 20:23, skrev Andrew Randrianasulu:<br>
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<div dir="auto"><a href="https://trac.ffmpeg.org/ticket/1258" rel="noreferrer noreferrer noreferrer noreferrer" target="_blank">https://trac.ffmpeg.org/ticket/1258</a>
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<div dir="auto">see attached to this ticket modded
decoder ...</div>
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<div dir="auto">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 ...</div>
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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):<br>
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<div dir="auto">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?</div>
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Well, I think Steve Mullen's handbook for Sony FX7 (mine) and V1
clarify there is only two audo channels on my FX7::<br>
<ul>
<li>There is two types of HDV: HD1/720p (19 Mbps) and HD2/1080i
/25 Mbps) and Canon's 1080p24.</li>
<li>HD1 is recorded to DV tape using only the DV video segment.
The PCM audio segment is open for future use.</li>
<li>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</li>
<li>as timecode. Because no PCM audio segments are available, HD2
cannot carry record PCM audio.</li>
<li>MPEG-1 Audio:</li>
<li>Both HD1 and HD2 support two audio channels of audio signals
that are digitized with a 48kHz at 16-bit quantization and
compressed to</li>
<li>384kbps by MPEG-1 Audio Layer 2 encoding. ProHD adds
two-channel PCM audio thus creating a format that can carry four
independent</li>
<li>channels of audio. (See Chapter 2 for an in-depth introduction
to MPEG-1 audio.)</li></ul></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">yeah, seems to be rarely supported on HDV cameras, see</div><div dir="auto"><br></div><div dir="auto"><a href="https://forum.blackmagicdesign.com/viewtopic.php?f=33&t=171688" rel="noreferrer noreferrer" target="_blank">https://forum.blackmagicdesign.com/viewtopic.php?f=33&t=171688</a><br></div><div dir="auto"><br></div><div dir="auto">but still!</div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto"><a href="https://ieba.wordpress.com/2008/01/21/hdv-grows-up-sonys-hvr-s270-and-hvr-z7/" target="_blank" rel="noreferrer">https://ieba.wordpress.com/2008/01/21/hdv-grows-up-sonys-hvr-s270-and-hvr-z7/</a><br></div><div dir="auto"><br></div><div dir="auto">=====</div><div dir="auto"><strong>4-Channel Audio</strong><br>
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.<br></div><div dir="auto">=====</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><ul>
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<blockquote><font face="Courier New, Courier, monospace">ffprobe
-hide_banner hdv07_05.m2t</font><br>
<font face="Courier New, Courier, monospace">[mpeg2video
@ 0x55d58a968340] Invalid frame dimensions 0x0.</font><br>
<font face="Courier New, Courier, monospace"> Last
message repeated 7 times</font><br>
<font face="Courier New, Courier, monospace">[mpegts @
0x55d58a93e580] Could not find codec parameters for
stream 2 (Unknown: none ([160][0][0][0] / 0x00A0)):
unknown codec</font><br>
<font face="Courier New, Courier, monospace">Consider
increasing the value for the 'analyzeduration' (0)
and 'probesize' (5000000) options</font><br>
<font face="Courier New, Courier, monospace">[mpegts @
0x55d58a93e580] Could not find codec parameters for
stream 3 (Unknown: none ([161][0][0][0] / 0x00A1)):
unknown codec</font><br>
<font face="Courier New, Courier, monospace">Consider
increasing the value for the 'analyzeduration' (0)
and 'probesize' (5000000) options</font><br>
<font face="Courier New, Courier, monospace">Input #0,
mpegts, from 'hdv07_05.m2t':</font><br>
<font face="Courier New, Courier, monospace">
Duration: 00:06:58.27, start: 3276.528000, bitrate:
25626 kb/s</font><br>
<font face="Courier New, Courier, monospace"> Program
100 </font><br>
<font face="Courier New, Courier, monospace"> 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</font><br>
<font face="Courier New, Courier, monospace"> Side
data:</font><br>
<font face="Courier New, Courier, monospace">
cpb: bitrate max/min/avg: 25000000/0/0 buffer size:
7340032 vbv_delay: N/A</font><br>
<font face="Courier New, Courier, monospace"> Stream
#0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003),
48000 Hz, stereo, fltp, 384 kb/s</font><br>
<font face="Courier New, Courier, monospace"> Stream
#0:2[0x815]: Unknown: none ([160][0][0][0] / 0x00A0)</font><br>
<font face="Courier New, Courier, monospace"> Stream
#0:3[0x811]: Unknown: none ([161][0][0][0] / 0x00A1)</font><br>
<font face="Courier New, Courier, monospace">Unsupported
codec with id 0 for input stream 2</font><br>
<font face="Courier New, Courier, monospace">Unsupported
codec with id 0 for input stream 3</font><br>
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