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 but still! > > > 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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