/demo/ - WebM test board

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File: 1379452234979.webm (2.37 MB, 1680x1050, capture.webm)

 No.16[View All]

ITT: ways of extracting clips from videos and editing them.

Here's a screen capture showing how to use ffmpeg and Avidemux to cut and crop a clip from a video. I've sped the action up by a factor of 2 so it's easier to watch.

I start by using converting the video into a format I know Avidemux can read. This isn't always necessary (and, in fact, wasn't in this case), but I wanted to show it anyway. To avoid having to convert the whole video, I start by opening it and finding the approximate time of the clip I want.

Then I invoke ffmpeg at the command prompt to convert the video:

ffmpeg -ss 20:40 -i source.mp4 -t 20 -pix_fmt yuv420p -c:v ffvhuff -an tmp1.mkv

To break this down:
> -ss 20:40
start at 20 minutes, 40 seconds
> -i source.mp4
input file is source.mp4
> -t 20
convert 20 seconds of video
> -pix_fmt yuv420p
8-bit YUV color with 4:2:0 chroma subsampling, the same as what's used in the VP8 format which is what we want at the end
> -c:v ffvhuff
Convert the video to the ffvhuff format. This is lossless format, meaning we don't lose quality by converting to it, but the files are very large.
> -an
no audio
> tmp1.mkv
the output file

(continued)
96 posts and 65 image replies omitted. Click reply to view.

 No.512

File: 1404784038843.webm (2.77 MB, 853x480, Hellsing Familiar.webm)

>>511

better

 No.513

File: 1404784146422.webm (630.89 KB, 853x480, Hellsing Suicide.webm)


 No.514

File: 1404784286311.webm (2.83 MB, 853x480, Hellsing Ultimate Fall of….webm)

>>513

negro

 No.515

File: 1404784714762.webm (1.98 MB, 608x256, Rampage.webm)


 No.516

File: 1404784798855.webm (2.6 MB, 640x480, Syrian Chrisitian militia….webm)

>>510

niggit

 No.517

File: 1404784845631.webm (2.09 MB, 1280x544, Zoolander.webm)


 No.518

File: 1404785027586.webm (2.7 MB, 853x480, Zoolander1.webm)

>>516
asdasd

 No.519

File: 1404786115282.webm (1.83 MB, 853x480, pol target practice.webm)


 No.529

File: 1405985750688.webm (1.53 MB, 480x480, 10B9E0.webm)


 No.540

File: 1406600692044.webm (180.07 KB, 330x322, quema.webm)

hmm les see

 No.549

File: 1407196997742.webm (3.29 MB, 640x360, output.webm)


 No.553

File: 1408362639989.webm (277.81 KB, 1280x720, out.webm)

Testing

 No.562

File: 1409156828921.webm (6.23 MB, 640x360, Butts.webm)

Testing

 No.572

File: 1409927193843.webm (617 KB, 1280x720, 0001.webm)

>>194
i did these and these is my first webm ever
i make 2 one VP8 (q=10) + Vorbis and the other VP8 (q=20) + Vorbis
600kp
400kp

what you think

and how yo make loop
and can i make it with out audio

 No.585

File: 1411431621083.webm (1.9 MB, 480x360, 41F0597648E70939526427CE4….webm)


 No.603

>>562
Is this Tera?

 No.613

File: 1418244528439.webm (326.41 KB, 718x404, finally sorta.webm)

Testing Webm

 No.620

File: 1420812666311.webm (2.93 MB, 1024x576, 1420717715315.webm)

fddf

 No.621

File: 1420812858735.webm (1.15 MB, 640x360, ggg.webm)


 No.636

File: 1423052543809.webm (2.3 MB, 680x384, besiege_2015-02-04_13-11-….webm)


 No.640

File: 1424208811629.webm (9.53 MB, 960x540, tyler doing something goo….webm)


 No.648

File: 1424980346068.webm (3.4 MB, 1280x720, Test2.webm)


 No.649

File: 1425310246647.webm (Spoiler Image, 2.27 MB, 1280x720, blue_bumb.webm)


 No.682

File: 1427612706519.webm (6.06 MB, 1280x720, ffxiv.webm)

nop

 No.697

File: 1430523359960.webm (9.78 MB, 640x360, Sena swimsuit Scene.webm)


 No.778


 No.780


 No.781


 No.785

File: 1446384522825.webm (2.79 MB, 1920x1080, Henshin.webm)


 No.798

File: 1448496825226.webm (935.32 KB, 480x480, ThriftyAggravatingHapuka[….webm)


 No.801

File: 1450100663548.webm (279.35 KB, 720x480, Golden Boy - Unbelievable.webm)

new test

 No.810

File: 1453631172934.png (534.88 KB, 962x825, wybm-4.png)


 No.812

File: 1454563242880.webm (31.17 KB, 360x240, movin head.webm)


 No.817

File: 1456162585942.jpg (103.21 KB, 700x700, a1504194870_16.jpg)

testing

 No.852


 No.853


 No.855

File: 1474100097235.webm (2.03 MB, 480x270, input.webm)


 No.858

File: 1478150905594.webm (1.05 MB, 426x240, girledcheese.webm)


 No.860

test

 No.867

File: 1484368063093.webm (507.75 KB, 856x480, flip.webm)


 No.868

File: 1484368719559.webm (496.03 KB, 856x480, flip_2.webm)


 No.869

File: 1484369632131.webm (400.33 KB, 856x480, flip sound test.webm)


 No.870

>>17
>>128
A note to anyone reading this in 2017: FFmpeg now supports a proper constant-quality mode with -crf 10 -b:v 0. This should replace the -qmin 10 -qmax 10 thing.

 No.873

File: 1485949988719.webm (9.21 MB, 1280x720, final.webm)

test

 No.877

<s>asdasdad</s>

 No.878

[spoiler]asdasdasd[/spoiler]

 No.879

[spoiler] asdsadasd [/spoiler]

 No.885

File: 1487514065492.webm (6.66 MB, 1920x1080, testinglimitations.webm)


 No.886


 No.917




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