ffmpeg_notes

__COMBINING VIDEO FILES INTO ONE VIDEO__
CONCATENATING
ffmpeg -i "20190718_131511.mp4" -i "20190718_132801.mp4" -i "20190718_134051.mp4" -i "20190718_135341.mp4" "kitty.mp4"


Hard-coding the Subtitles into the Video:

1.)  converting the mp4 to uploadable mp4
ffmpeg -i "V niin kuin ketutus english subs.mp4" "V niin kuin ketutus english subs2.mp4"

2.)  converting the subtitle file into something useful
ffmpeg -i "V niin kuin ketutus.en.srt" subtitles.ass

3.)  hard-coding the subtitles to the video
ffmpeg -i "V niin kuin ketutus english subs.mp4" -vf ass=subtitles.ass "V niin kuin ketutus english subtitles.mp4"

= = = MOAR = = =

ffmpeg -i "joint resolution37 amendment 13 Feb 2019 sm.mp4" -b 125k "Joint_House_Resolution_37_amendment_13_Feb_2019.mp4"

took a 22+MB mp4 and downgraded the bitrate so that it was just over 15MB in size

First - I looked at the file details------
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$ ffmpeg -i "joint resolution37 amendment 13 Feb 2019 sm.mp4"
ffmpeg version 3.3.4-1mx17+2 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  configuration: --prefix=/usr --extra-version=1mx17+2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'joint resolution37 amendment 13 Feb 2019 sm.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41iso4
    creation_time   : 2019-02-13T21:28:04.000000Z
  Duration: 00:07:56.82, start: 0.000000, bitrate: 375 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x360, 305 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2019-02-13T21:28:04.000000Z
      handler_name    : Vireo Eyes v2.4.28
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 65 kb/s (default)
    Metadata:
      creation_time   : 2019-02-13T21:28:04.000000Z
      handler_name    : Vireo Ears v2.4.28
At least one output file must be specified

-----You see that?  Bitrate is 375k? -----
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So, I dropped the bitrate down to 125k and changed the filename a little

$  ffmpeg -i "joint resolution37 amendment 13 Feb 2019 sm.mp4" -b 125k "Joint_House_Resolution_37_amendment_13_Feb_2019.mp4"

Now doing the same thing except I want to convert it to webm

$  ffmpeg -i "joint resolution37 amendment 13 Feb 2019 sm.mp4" -b 125k "Joint_House_Resolution_37_amendment_13_Feb_2019.webm"

Its taking a much longer time.

$  ffmpeg -i Joint_House_Resolution_37_amendment_13_Feb_2019.mp4 -b 125k -ac 1 -ar 32000 -ab 96 Joint_House_Resolution_37_amendment_13_Feb_2019_Smaller.mp4
(-b 125K reduces video bitrate to 125K)
(-ac 1 (one) : converts stereo to mono)
(-ab 96 : reduces audio bitrate to 96)
(-ar 32000 : reduces the 44100 to 32000)
-filter:v scale=1280:720 -c:a copy ---- scaling
or
-s 1280x720 -c:a copy
The following command will compress and reduce the output file’s size.
$ ffmpeg -i input.mp4 -vf scale=1280:-1 -c:v libx264 -preset veryslow -crf 24 output.mp4
Please note that you will lose the quality if you try to reduce the video file size. You can lower that crf value to 23 or lower if 24 is too aggressive.

You could also transcode the audio down a bit and make it stereo to reduce the size by including the following options.

-ac 2 -c:a aac -strict -2 -b:a 128k

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https://www.ostechnix.com/20-ffmpeg-commands-beginners/


ffmpeg -i filename.ext ---- just gives details about the file

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Adding a picture to an audio file
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i albumart.jpg -i "08 - Into The Void.mp3" -c:v libx264 -c:a aac -strict experimental -b:a 128k -shortest output.mp4
==to vp8 under 8GB==
==example:
==  ffmpeg -i Hi_Stranger.mp4 -c:v libvpx -c:a libvorbis -s 480:270 -ab 80k -b:v 150k -ar 24000 Hi_Stranger_480x270.webm
==  ffmpeg -loop 1 -i albumart.jpg -i "08 - Into The Void.mp3" -s 200:200 -c:v libvpx -c:a libvorbis -strict experimental -b:a 128k -shortest Black_Sabbath_Into_The_Void_200x200.webm
==          it looks like its working
a 6:11 song intu 7,984 kb - 7.9 Mb



$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
$ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4



works - image and mp3 to mp4
ffmpeg -r 1 -i cdc_logo.png -i t0221-cdc-telebriefing-covid-19.mp3 -ac 1 -b:a 45K -c:v libx264 -b 50k -c:a aac -strict experimental 21_feb_2020_cdc_brief.mp4

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## started with 28.9 Mb filesize

Duration: 00:08:38.50, start: -0.007000, bitrate: 445 kb/s
    Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 1280x720, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default

## converter command

$ ffmpeg -i "Demographic Hypocrisy-A19oaNXrapE.webm" -b:v 125k -ac 1 -ab 96k -ar 24000 -s 544:306 "Demographic_Hypocrisy_from_Know_More_News_Youtube.webm"

## thinking that this might reduce it below 16Mb)
## 2:30 = 5Mb
## 38 sec = 0.633333333333
## calculations say 17.26 Mb
came out as 17.6 Mb

trying to only resize to 544 x 306

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List of perfect 16:9 ratios
1920 x 1080
1904 x 1071
1888 x 1062
1872 x 1053
1856 x 1044
1840 x 1035
1824 x 1026
1808 x 1017
1792 x 1008
1776 x 999
1760 x 990
1744 x 981
1728 x 972
1712 x 963
1696 x 954
1680 x 945
1664 x 936
1648 x 927
1632 x 918
1616 x 909
1600 x 900
1584 x 891
1568 x 882
1552 x 873
1536 x 864
1520 x 855
1504 x 846
1488 x 837
1472 x 828
1456 x 819
1440 x 810
1424 x 801
1408 x 792
1392 x 783
1376 x 774
1360 x 765
1344 x 756
1328 x 747
1312 x 738
1296 x 729
1280 x 720
1264 x 711
1248 x 702
1232 x 693
1216 x 684
1200 x 675
1184 x 666
1168 x 657
1152 x 648
1136 x 639
1120 x 630
1104 x 621
1088 x 612
1072 x 603
1056 x 594
1040 x 585
1024 x 576
1008 x 567
992 x 558
976 x 549
960 x 540
944 x 531
928 x 522
912 x 513
896 x 504
880 x 495
864 x 486
848 x 477
832 x 468
816 x 459
800 x 450
784 x 441
768 x 432
752 x 423
736 x 414
720 x 405
704 x 396
688 x 387
672 x 378
656 x 369
640 x 360
624 x 351
608 x 342
592 x 333
576 x 324
560 x 315
544 x 306
528 x 297
512 x 288
496 x 279
480 x 270
464 x 261
448 x 252
432 x 243
416 x 234
400 x 225
384 x 216
368 x 207
352 x 198
336 x 189
320 x 180
304 x 171
288 x 162
272 x 153
256 x 144
240 x 135
224 x 126
208 x 117
192 x 108
176 x 99
160 x 90
144 x 81
128 x 72
112 x 63
96 x 54
80 x 45
64 x 36
48 x 27
32 x 18
16 x 9

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Download Youtube Playlist (mp4 formats)

$ youtube-dl -i -f mp4 --yes-playlist 'https://www.youtube.com/watch?v=A9ibhWgMlso&list=PLk7MlpewRSRnzt6NrygRlgJn6S9U34wOp'

THEN
BATCH CONVERT
FROM mp4 to mp3

$ for i in *.mp4; do ffmpeg -i "$i" "${i%.*}.mp3"; done

$ for i in *.webp; do ffmpeg -i "$i" "${i%.*}.png"; done


$ for i in *.m4a; do ffmpeg -i "$i" "${i%.*}.mp3"; done

for i in *.png; do ffmpeg -i "$i" "${i%.*}.tif"; done



::: Note - could not download playlist directly to mp3s yet  :::



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Here are the properties for a 29-minute video under 15 Mb:
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Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ForensicProof_2ndShooter_LasVegas.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:29:09.25, start: 0.000000, bitrate: 70 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 44 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 18 kb/s (default)
    Metadata:
      handler_name    : SoundHandler



so,
ffmpeg -i filename.mp4 -b:v 70k -ac 1 -ab 18k -ar 24000 -s 640:360 filename.webm ------ but I'm sure there's more

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FIXED ASPECT FROM 4:3 to 16:9

$ ffmpeg -i "Dr. James Johnson Demographic Realities The Browning and Graying of America.mp4" -aspect 16:9 "Dr. James Johnson Demographic Realities The Browning and Graying of America fixed.mp4"

==Original File:============
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Dr. James Johnson Demographic Realities The Browning and Graying of America.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2017-06-16T15:02:27.000000Z
  Duration: 00:54:17.25, start: 0.000000, bitrate: 350 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 252 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (default)
    Metadata:
      creation_time   : 2017-06-16T15:02:40.000000Z
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
===========================
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vp8 webm for 4 chan

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1.)  -an -c:v libvpx -b:v 1M -c:a libvorbis  (Don't remember if that worked,)
       but this did:
2.)  ffmpeg -i Hi_Stranger.mp4 -c:v libvpx -c:a libvorbis -s 480:270 -ab 80k -b:v 150k -ar 24000 Hi_Stranger_480x270.webm
           that is WITH AUDIO
            -an is added to remove audio

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ffmpeg -i VIDEO1.mp4 -s 640:360 -ac 1 -ab 96k -b:v 200k -ar 24000 VIDEO1.webm
converted a 5:49.39 1280x720 26.8 MiB to 640x360 13.7 Mb

-r 30  = 30 fps

burned the subtitles in with:::  -vf subtitles=subtitle.srt   ::: same settings with everything else, and





ffmpeg -i Tucker_6_Dec_2019_HR_5038_b.webm -s 640:360 -ac 1 -ab 96k -b:v 200k -ar 24000 Tucker_6_Dec_2019_HR_5038_c.webm
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Input #0, matroska,webm, from 'Tucker_6_Dec_2019_HR_5038_b.webm':
  Metadata:
    ENCODER         : Lavf58.20.100
  Duration: 00:06:41.80, start: 0.000000, bitrate: 2665 kb/s
    Stream #0:0: Video: vp8, yuv420p(bt709/unknown/bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      DURATION        : 00:06:41.804000000
    Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
    Metadata:
      DURATION        : 00:06:41.759000000
Stream mapping:
  Stream #0:0 -> #0:0 (vp8 (native) -> vp9 (libvpx-vp9))
  Stream #0:1 -> #0:1 (vorbis (native) -> opus (libopus))
Press [q] to stop, [?] for help
[libvpx-vp9 @ 0x55732a81fd00] v1.7.0
Output #0, webm, to 'Tucker_6_Dec_2019_HR_5038_c.webm':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 200 kb/s, 29.97 fps, 1k tbn, 29.97 tbc (default)
    Metadata:
      DURATION        : 00:06:41.804000000
      encoder         : Lavc58.35.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: opus (libopus), 24000 Hz, mono, flt, 96 kb/s (default)
    Metadata:
      DURATION        : 00:06:41.759000000
      encoder         : Lavc58.35.100 libopus
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I'm converting it to vp9
should have added
-c:v libvpx

I may get the chance to - the video doesn't look like its going to be under 16MB
also
shrink it to 480 x 270

ffmpeg -i Tucker_6_Dec_2019_HR_5038_b.webm -c:v libvpx -s 480:270 -ac 1 -ab 96k -b:v 200k -ar 24000 Tucker_6_Dec_2019_HR_5038_d.webm

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ffmpeg -i Farrakhan_on_LeBron_James_and_Jewish_Control_July_11_2010.mp4 -s 320:240 -ac 1 -ab 50k -b:v 100k -ar 12000 Farrakhan_on_LeBron_James_and_Jewish_Control_July_11_2010.webm

 35.7 Mb to 12.3 Mb (4:3 ratio)
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4:3 video
https://www.videoproc.com/video-process/4-3-resolutions.htm

Change the Aspect Ratio
ffmpeg -i xxxxxx.mp4 -aspect 400:300 xxxxxx_400x300.mp4


1.5 ratio
720:480
600:400
480:320




-s 640:360 -c:v libvpx -ac 1



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downscale

ffmpeg -i input_1280x720.mp4 -vf scale=640x480:flags=lanczos -c:v libx264 -preset slow -crf 21 output_compress_640x480p.mp4

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changing the framerate to 30 fps
ffmpeg -i <input> -filter:v fps=fps=30 <output>

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one command to change the resolution of a video:
ffmpeg -i input.mp4 -vf scale=-1:720 output.mp4

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Lower the quality of H264 but keep it in H264 format
Start

Resolution: 1920 x 1080
Frames Per Second: 60
Video Format: ITU H.264
Audio Format: MPEG 1 Audio, Layer 3 (MP3)

(Incomplete)



To test audio quality simply use the name of the audio file as follows:

$ ffplay audio_filename1.mp3


To compare videos and audios after converting you can use the commands below. This helps you to test videos and audio quality.

$ ffplay video1.mp4




4chins vp8

-c:v libvpx -c:a libvorbis -s 480:270 -ab 80k -b:v 150k -ar 24000

-c:v libvpx -c:a libvorbis -s 320:180 -ab 80k -b:v 150k -ar 24000

Pandemic is Over Lies exposed Agendas Revealed by Pfizer Chief Scientific Advisor-TMGJRV-u_ts_f136_640x360.webm

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Splitting up video into timed chunks:

ffmpeg -i input.mp4 -c copy -map 0 -segment_time 00:04:00 -f segment output%03d.mp4

or

ffmpeg -i input.mp4 -ss 00:00:00 -to 00:04:00 -c copy output1.mp4
ffmpeg -i input.mp4 -ss 00:04:00 -to 00:08:00 -c copy output2.mp4