On Sunday, December 19, 2021, Terje J. Hanssen <[email protected]> wrote:
> > > Den 19.12.2021 01:00, skrev Andrew Randrianasulu: > > > > On Sunday, December 19, 2021, Terje J. Hanssen <[email protected]> > wrote: > >> >> >> Den 18.12.2021 04:35, skrev Andrew Randrianasulu: >> >>> >>> >>> On Saturday, December 18, 2021, Terje J. Hanssen < >>> [email protected] <mailto:[email protected]>> wrote: >>> >>> >>> >>> Den 17.12.2021 22:49, skrev Andrew Randrianasulu: >>> >>> >>> >>> On Saturday, December 18, 2021, Terje J. Hanssen via Cin >>> <[email protected] >>> <mailto:[email protected]> >>> <mailto:[email protected] >>> <mailto:[email protected]>>> wrote: >>> >>> >>> >>> Den 17.12.2021 15:00, skrev Terje J. Hanssen: >>> >>> >>> Den 17.12.2021 04:58, skrev Andrew Randrianasulu: >>> >>> >>> >>> On Friday, December 17, 2021, Terje J. Hanssen >>> <[email protected] >>> <mailto:[email protected]> >>> <mailto:[email protected] <mailto:[email protected] >>> >> >>> <mailto:[email protected] >>> <mailto:[email protected]> >>> <mailto:[email protected] >>> <mailto:[email protected]>>>> wrote: >>> >>> [......] >>> >>> =============== >>> >>> I-frame-only 50 Megabit MPEG-2 or comparable >>> DV50 in >>> 4:2:2 as >>> high-end, "visually lossless" intermediate >>> format for >>> archival and >>> suited for editing? >>> >>> ----------------- >>> >>> Regarding DV50, FFMpeg has a friendly "target >>> dv50" >>> support >>> (similar as "target DVD"). So to get a first >>> look on a >>> DV50 test >>> file, I simply transcoded 422/10bit Video and PCM >>> audio from a MOV >>> file (ProRes 422HQ) to a raw DV50 (422/8bit) >>> file: >>> >>> ffmpeg -i SD-MOV.mov -target pal-dv50 >>> SD-DV50.dv >>> >>> [......] >>> >>> >>> 205M SD-DV50.dv (ffmpeg re-encoded/remuxed) >>> AV-info: >>> >>> avprobe SD-DV50.dv >>> avprobe version 12.3, Copyright (c) 2007-2018 the >>> Libav developers >>> built on Mar 26 2018 12:39 with gcc 11 (SUSE >>> Linux) >>> [dv @ 0x55cdddb96440] Estimating duration from >>> bitrate, this may >>> be inaccurate >>> Input #0, dv, from 'SD-DV50.dv': >>> Metadata: >>> timecode : 00:00:00:00 >>> Duration: 00:00:29.80, start: 0.000000, >>> bitrate: >>> 57600 kb/s >>> Stream #0:0: Video: dvvideo, yuv422p, >>> 720x576 [SAR >>> 16:15 DAR >>> 4:3], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc >>> Stream #0:1: Audio: pcm_s16le, 48000 Hz, >>> stereo, >>> s16, 1536 kb/s >>> Stream #0:2: Audio: pcm_s16le, 48000 Hz, >>> stereo, >>> s16, 1536 kb/s >>> # avprobe output >>> >>> =================== >>> >>> As seen above, it looks like ffmpeg produced >>> wrong >>> meta data for >>> the DV50 video bitrate (25 Mb/s=DV25), while >>> the total >>> bitrate >>> 57.6 Mb/s is correct. (Also similar was seen with >>> ffprobe and >>> Mediainfo). >>> >>> My VLC player or Gnome movieplayer did not >>> playback >>> the DV50 file, >>> while ffplay did (as usual without audio?). >>> >>> Cin-GG miss a DV50 preset among format setting. >>> However DV50 else >>> loades preliminary OK in Cin-GG (via ffmpeg). >>> >>> >>> I'll look at dv50 output preset.. >>> >>> Fine >>> >>> =============== >>> >>> I tried also to transcode and remux 422 Video and PCM >>> Audio to a >>> 50 Mbps MPEG-2 I-frame only program stream. >>> >>> 1) MPG From MOV (ProRes 422HQ) >>> ------------------------------ >>> >>> ffmpeg -i SD-MOV.mov -c:v mpeg2video -bf 2 -b:v 50M >>> -maxrate 50M >>> -minrate 50M -c:a pcm_s16be -f vob SD-MP2I-50.mpg >>> [....] >>> Stream mapping: >>> Stream #0:0 -> #0:0 (prores (native) -> mpeg2video >>> (native)) >>> Stream #0:1 -> #0:1 (pcm_s24le (native) -> pcm_s16be >>> (native)) >>> Press [q] to stop, [?] for help >>> [mpeg2video @ 0x560ffd164ec0] Automatically choosing VBV >>> buffer >>> size of 746 kbyte >>> [vob @ 0x560ffd14d180] At most 8 channels allowed for LPCM >>> streams. >>> Could not write header for output file #0 (incorrect codec >>> parameters ?): Invalid argument >>> Error initializing output stream 0:1 -- >>> >>> ***This failed because PreRes Audio uses 16 channels:*** >>> >>> >>> yeah... interesting limitation.. and interesting number of >>> channels.. >>> >>> >>> ffprobe SD-MOV.mov 2>&1 >/dev/null | grep Stream.*Audio >>> Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), >>> 48000 >>> Hz, 16 channels, s32 (24 bit), 18432 kb/s (default) >>> >>> >>> 2) MPG from DV50 >>> ---------------- >>> ffmpeg -i SD-DV50.dv -c:v mpeg2video -bf 2 -b:v 50M >>> -maxrate 50M >>> -minrate 50M -c:a pcm_s16be -f vob SD-MP2I-50.mpg >>> >>> du -sh * >>> 205M SD-DV50.dv >>> 284M SD-MOV.mov >>> 186M SD-MP2I-50.mpg >>> >>> avprobe SD-MP2I-50.mpg >>> Input #0, mpeg, from 'SD-MP2I-50.mpg': >>> Duration: 00:00:29.77, start: 0.540000, bitrate: 52167 kb/s >>> Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), >>> yuv422p(tv, >>> progressive), 720x576 [SAR 16:15 DAR 4:3], 50000 kb/s, 25 >>> fps, 25 >>> tbr, 90k tbn, 50 tbc >>> Stream #0:1[0xa0]: Audio: pcm_dvd, 48000 Hz, 2 >>> channels, s16, >>> 1536 kb/s >>> >>> ***** The SD-MP2I-50.mpg file size is here 90% of DV50 >>> ******** >>> >>> The SD-MP2I-50.mpg playback ok with VLC, Gnome movieplayer, >>> ffplay, and loads and playback in Cin-GG >>> The audio volume seems low (weak), but can probably be >>> adjusted >>> higher with ffmpeg >>> >>> >>> well, but I missed keyframe parameter? bitrate is big but I >>> think without special param ffmpeg still will not make all-I >>> mpeg2 stream..? >>> >>> >>> >>> The first Video part of my ffmpeg script was based on this >>> standard FFmpeg Howto for >>> "MPEG-2 I-frame only Highest Quality Encoding", which didn't >>> include a keyframe parameter !? >>> https://brunosan.eu/images/ffmpeg_howto.html#Encoding_MPEG-2 >>> _I-frame_only_in_Highest_Quality >>> <https://brunosan.eu/images/ffmpeg_howto.html#Encoding_MPEG- >>> 2_I-frame_only_in_Highest_Quality> >>> >>> ffmpeg -i <input_file> -vcodec mpeg2video -pix_fmt yuv422p -qscale >>> 1 -qmin 1 -intra -an output.m2v >>> >>> >>> you missed >>> >>> -intra? >>> >> >> Thanks for reviewing. "-intra" should definitely be there, and I know I >> used it before editing and troubleshooting the audiopart, removing -an. >> Cleaned up and added also some other parameters >> -q:v 1 -qmin 1 -intra >> >> >> 3) MP2I50 from DV50: >> --------------------- >> ffmpeg -i SD-DV50.dv -c:v mpeg2video -q:v 1 -qmin 1 -intra -bf 2 -b:v 50M >> -maxrate 50M -minrate 50M -c:a pcm_s16be -f vob SD-MP2I50.mpg >> [...] >> Input #0, dv, from 'SD-DV50.dv': >> Metadata: >> timecode : 00:00:00:00 >> Duration: 00:00:29.80, start: 0.000000, bitrate: 57600 kb/s >> Stream #0:0: Video: dvvideo, yuv422p, 720x576 [SAR 16:15 DAR 4:3], >> 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc >> Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s >> Stream #0:2: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s >> [... a lot of vob buffer messages scrolling ....] >> [vob @ 0x564dbf6a0680] packet too large, ignoring buffer limits to mux it >> [vob @ 0x564dbf6a0680] buffer underflow st=1 bufi=7204 size=7680 >> frame= 745 fps=460 q=1.0 Lsize= 189584kB time=00:00:29.76 >> bitrate=52186.6kbits/s speed=18.4x >> video:181698kB audio:5588kB subtitle:0kB other streams:0kB global >> headers:0kB muxing overhead: 1.227127% >> >> avprobe SD-MP2I50.mpg >> avprobe version 12.3, Copyright (c) 2007-2018 the Libav developers >> built on Mar 26 2018 12:39 with gcc 7 (SUSE Linux) >> Input #0, mpeg, from 'SD-MP2I50.mpg': >> Duration: 00:00:29.80, start: 0.540000, bitrate: 52116 kb/s >> Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p(tv, >> progressive), 720x576 [SAR 16:15 DAR 4:3], 50000 kb/s, 25 fps, 25 tbr, 90k >> tbn, 50 tbc >> Stream #0:1[0xa0]: Audio: pcm_dvd, 48000 Hz, 2 channels, s16, 1536 >> kb/s >> >> ================ >> >> (Re)tested also with >> >> 4) No intra (-intra) >> ffmpeg -i SD-DV50.dv -c:v mpeg2video -bf 2 -b:v 50M -maxrate 50M -minrate >> 50M -c:a pcm_s16be -f vob SD-MP2-50.mpg >> >> 5) Without specified Video bitrate (-b:v) >> ffmpeg -i SD-DV50.dv -c:v mpeg2video -q:v 1 -qmin 1 -intra -bf 2 -c:a >> pcm_s16be -f vob SD-MP2I-.mpg >> >> 6) Video only - no Audio (-an): >> ffmpeg -i SD-DV50.dv -vcodec mpeg2video -q:v 1 -qmin 1 -intra -an >> SD-MP2I50-an.m2v >> >> ----------------- >> >> du -sh * >> 284M SD-MOV.mov >> 205M SD-DV50.dv >> 186M SD-MP2I50.mpg (3) >> 186M SD-MP2-50.mpg (4) >> 153M SD-MP2I-.mpg (5) >> 146M SD-MP2I50-an.m2v (6) >> >> As seen, no size difference between -intra (3) and without intra flag >> specified (4) above: >> 186/205 = 90% size of the input SD-DV50.dv >> >> I would expect this due to high bitrate and some more effectiv video >> compression for MPEG-2 over DV50. >> While the consumer DV25/4:2:0 pal uses 5:1 intra compression, the >> pro(sumer) DV50/4:2:2 uses lower 3.3:1. >> >> ------------- >> >> 7) Another, equivalent SD MPEG-2/ 422P@ML option to setup for Cin-GG/ >> FFMpeg preset could be: >> >> D10 aka Sony IMX50 Encoding - a standard definition professional video >> recording format. Uses intraframe >> compression, 4:2:2 color subsampling and user-selectable constant video >> data rate of 30, 40 or 50 Mbit/s. >> >> 422P@ML 720 × 576 25 FPS 4:2:2 Sampling 50 Mbits/s >> Sony IMX50 (I only), Broadcast Contribution (I&P only) >> >> The Howto contains both a short and a long script version. >> >> ---------------- >> >> >>> ffmpeg changes cmd line and API quickly.. ( >>> >>> try "-g 1" and check keyframes with some linevlike those? >>> >>> https://snippets.bentasker.co.uk/page-1707191206-Get-Video-K >>> eyframe-Interval-(ffprobe)-BASH.html <https://snippets.bentasker.co >>> .uk/page-1707191206-Get-Video-Keyframe-Interval-(ffprobe)-BASH.html> >>> >>> >> I tried to copy and paste some line from the manual url, but >> If you possibly can setup an exact FF syntax to run here, I can do it ;) > > > attached copy of script Phyllis send to me back in 2019 > > > Sorry I'm not skilled with sed scripts. "Somewhere" I would expect my > encoded file name "SD-MP2I50.mpg" should be put in to be read and analyzed > with ffprobe? And what about the first mentioned "-g 1" ? > try to run script like this (after chmod +x on it) : $ ./kfrm.sh vid_20210526.mp4 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid_20210526.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.76.100 Duration: 00:00:36.64, start: 0.000000, bitrate: 1314 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown), 640x480 [SAR 27:64 DAR 9:16], 1217 kb/s, 29.58 fps, 29.58 tbr, 11360 tbn, 59.17 tbc (default) Metadata: handler_name : VideoHandle vendor_id : [0][0][0][0] Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 90 kb/s (default) Metadata: handler_name : SoundHandle vendor_id : [0][0][0][0] key_frame=1 key_frame=0 key_frame=0 for all I frames it should output key_frame=1 for all (many!) frames. you can add ' | grep 0' at the end of this line and see how many non-keyframes it will find. -g is ffmpeg parameter setting distance between keyframes. > > > What are we really searching for or verify in this I-frame only encoded > MPEG-2 video file ? > yes we try to verify it really all-I frames file. (impact seekability among other things) > > And isn't keyframes another (previous?) name for Intra-frames? > yes, as far as I know. > > > > > > > > > > > >> >> >>> >>> >>> >>> I dropped -pix_fmt yuv422p when I saw it was detected and >>> automatic from the input file. >>> >>> >>> So I added the second PCM Audio part (similar I did for SD-DV) >>> according to 1. Answer at >>> https://stackoverflow.com/questions/48265448/mpeg-2-program- >>> stream-w-pcm-audio >>> <https://stackoverflow.com/questions/48265448/mpeg-2-program >>> -stream-w-pcm-audio> >>> >>> FFmpeg only supports muxing 16 bit PCM in a MPEG2 PS. Use >>> >>> ffmpeg -i "input.mov" \ >>> -c:v mpeg2video -pix_fmt yuv422p -bf 2 -b:v 50M -maxrate 50M >>> -minrate 50M \ >>> -s 1920x1080 -aspect 16:9 \ >>> -c:a pcm_s16be -f vob "output.mpg" >>> >>> The -f vob is needed to force a MPEG-2 PS, else ffmpeg will select >>> MPEG-1 Systems muxer. >>> >>> >>> >>> >> >> >> >
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