Den 23.11.2020 02:20, skrev Andrew Randrianasulu:
В сообщении от Monday 23 November 2020 03:51:36 Terje J. Hanssen via Cin написал(а):
This topic is treated with reference to the current Cinelerra-GG Manual (and in the Features5 document at least since early 2018):
* 14.6 HDV on a Blu-ray Disc Without Re-encoding
An MTS file is a video file saved in the high-definition (HD) MPEG Transport Stream video format, commonly called AVCHD. It contains HD video compatible with Blu-ray disc format and is based on the MPEG-2 transport stream. MTS files are often used by Sony, Panasonic, Canon and other HD camcorders. Legal in- put for Video – MPEG1VIDEO, MPEG2VIDEO, H264; Audio – MP1, MP2, AC3, AC3PLUS, DTS, TRUHD.
For creating a blu-ray disc, if you have HDV MPEG-2 media that is in blu-ray format, you can save the original quality of your work, rather than rendering it to another format. Follow the steps below directly instead of going through C INELERRA-GG. It has been tested on 10 different MTS files.
du -sb /yourHDVfile.MTS # Determine the size of your file in bytes.
blocks=((size-in-bytes/2048 + 4096)) # Convert bytes into blocks + a little more.
mkudffs /tmp/newfilename.udfs blocks # Create a file with that # of blocks + some extra.
mount -o loop /tmp/newfilename.udfs /mntX # Use a mount point like mntX that is not in use.
/<cinelerra_installed_path>/bin/bdwrite /mntX /tmp/yourHDVfile.MTS # Substitute cinelerra path.
umount /mntX # You must unmount the udfs filesystem
growisofs -Z /dev/bd=/tmp/newfilename.udfs # Replace /dev/bd with your bluray hardware device.
OR dd if=/tmp/newfilename.udfs of=/dev/bd bs=2048000 # if using rewritable blu-ray; replace bd.
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When the 1080i/25 HDV-source is recorded via i.Link (Firewire) to disk, the file type and format is HDV.M2T
For this test I use the same, downloaded HDV file as previous mentioned (not my file or camcorded by me!)
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 Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 384 kb/s
The MPEG2 Video stream is Blu-ray compatible format, while the MP2 Audio stream has to be converted to AC3.
Demux, convert the audio and remux to a M2TS stream using this ffmpeg command:
ffmpeg -i 20081103140154.m2t -vcodec copy -acodec ac3 20081103140154.m2ts
............. skip
Input #0, mpegts, from '20081103140154.m2t': Duration: 00:00:13.44, start: 1042.400000, bitrate: 26598 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 Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 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) Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (mp2 (native) -> ac3 (native)) Press [q] to stop, [?] for help Output #0, mpegts, to '20081103140154.m2ts': Metadata: encoder : Lavf57.83.100 Stream #0:0: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], q=2-31, 25000 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s Metadata: encoder : Lavc57.107.100 ac3 frame= 336 fps=0.0 q=-1.0 Lsize= 45549kB time=00:00:13.43 bitrate=27774.3kbits/s speed= 107x video:41008kB audio:315kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 10.225909%
Comment The default AC3 bitrate 192 kb/s here is halph of the source MP2 bitrate 384 kb/s. Any idea about the quality difference? Try to listen to it (with VLC?)?
*I think* 384 kb/s was for 5.1 ac3 sound .. so, stereo can be compressed further.
https://www.vegascreativesoftware.info/us/forum/ac-3-bitrate--63214/ this says 448 kb/s for 5.1
I could not and cannot hear especial noticeable difference using VLC. (Another more suited audio file without background noise, I don't know)
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So further to trouble using the procedure steps from the Manual above:
Determine the size of the file in bytes.
du -sb 20081103140154.m2ts 46642368 20081103140154.m2ts
Try to calculate the blocks as
blocks=((/466423682048 + 4096)) = 26870.59375 ??
# mkudffs /tmp/bd_20201122_hdv_m2ts.udfs blocks 26870.59375 mkudffs: invalid block-count
Obviously something went wrong here. Try to round up this size in blocks? 26870.59375 -> 26871
I didn't mentione I tried just that also. And again, the same error message: # mkudffs /tmp/bd_20201122.udfs blocks 26871 mkudffs: invalid block-count (I tried also other file-names without succeed, because I seem to remember back there was filename limits somewhere when rendering Blu-rays from Cin).
Could someone test and verify these steps and further, to see if a successful Blu-ray BDAV structure is created?
(Just now I have no Blu-ray burner in my working PC, so I have to wait with burning the image to a BD-R/RE discs).
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Terje J. H
One current and one previous related Blu-ray mail threads as references: https://lists.cinelerra-gg.org/pipermail/cin/2020-November/002709.html https://lists.cinelerra-cv.org/pipermail/cinelerra/2016q4/005609.html