/demo/ - WebM test board

Password (For file deletion.)

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

 No.16[Last 50 Posts]

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



File: 1379453376042.webm (830.08 KB, 466x600, out.webm)

Then I open the video in Avidemux to cut and crop it. You can do this stuff in ffmpeg too, but it's nice to have a GUI here so you can see what you're doing.

I seek to the start time I want, click the B to select everything before that time, and delete it. I do the same thing at the end with the A button.

I set up Avidemux to save in ffvhuff video format in an mkv container. Cropping the video is done by adding a filter to the output. It's a good idea to make all the parameters multiples of 2 because of chroma subsampling (the video does not contain color for individual pixels, but only for 2x2 blocks of pixels).

The last step is to convert the video to VP8 video in a WebM container. This is done with the ffmpeg command

ffmpeg -i tmp2.mkv -qmin 10 -qmax 10 out.webm

This is lossy compression, and the number 10 controls the quality of the video. A smaller value will give you a better-looking video, but at the cost a larger file size.


Well this is pretty cool. Hope moot can be convinced to fold this into 4chan at some point. Is it possible to make these behave more like .gifs (no seek bar, audio etc.)?


If you right-click on a video, you can turn the controls off. Speaking more generally, when you put a <video> on an HTML5 website, the controls attribute tells the browser whether it should add controls.

There's an option in the settings to mute the sounds when you start playing a video, although it doesn't apply when you open the file directly using the link above the thumbnail. And it's not hard to block the posting of videos with sound tracks if one wishes (obviously I haven't).

I'm more interested in getting GIF and APNG files to behave more like videos. Having a seek bar and pause button available is a good thing.


File: 1384885379268.webm (568.34 KB, 466x600, out.webm)

An update to this:


-quality best

will make the encoding run slower, but will give you better file sizes for the same quality. This is a good idea for short clips, but may exceed your patience for longer ones.

Here is the result of

ffmpeg -i tmp2.mkv -qmin 10 -qmax 10 -quality best out.webm

For more details on tweaking the encoding parameters, read



File: 1384888796232.webm (305.71 KB, 292x388, out.webm)

I'm pretty sure "-qmin 10" and "-qmax 10" override the "-quality best" parameter, I tried and the output file was bigger when I removed qmin and qmax but left "quality best".
By the way, Avidemux isn't necessary for that kind of job, you can do it all with one command in ffmpeg.
These were the settings I used for this file:

ffmpeg -ss 05:45.70 -i source.mkv -t 9.70 -vf crop=292:388:731:414 -sn -quality best out.webm

source.mkv is just SnW ep2 renamed.
Removes the subtitles. Always use this parameter when encoding a video with subtitles to webm.
>-vf crop=292:388:731:414
Applies the crop filter. You can read this page to learn about more video filters and how they work:


>I'm pretty sure "-qmin 10" and "-qmax 10" override the "-quality best" parameter
No, they're entirely separate things. The -quality setting is about the CPU time, and -qmin and -qmax are about bitrate vs quality.

If you remove the -qmin and -qmax, you get encoding at the default bitrate of 250 kbits/second. Depending on your video, that may be too large or far too small.

Another option worth trying is the -crf option; with libvpx that gives you something close to the -qmin -qmax thing, but frames which may be used as references for other frames get encoded with a higher quality than the others. But with -crf you still have to set -b:v (unless you want the default 250 kbits/s), which functions as a maximum bitrate.

>By the way, Avidemux isn't necessary for that kind of job, you can do it all with one command in ffmpeg.

That's true and worth pointing out. Although it's convenient to have a GUI for cutting and cropping so I can see what I'm doing.


File: 1384900778349.webm (1.95 MB, 500x532, panzer.webm)

My bad, I should've looked it up in the docs. There's a lot of options and I get easily confused.
>Although it's convenient to have a GUI for cutting and cropping so I can see what I'm doing.
Fair enough.

Testing crop filter combined with scale, settings used:
ffmpeg -ss 11:10 -i garupan07.mkv -qmin 10 -qmax 10 -t 9 -vf "crop=w=1000:h=1064:x=920:y=16,scale=500:532" -sn panzer.webm


File: 1385232640596.webm (620.06 KB, 1280x720, gaki no anime.webm)

Another thing to watch out for:

Apparently ffmpeg doesn't do the necessary colorspace conversions automatically, so you have to do it by hand with the colormatrix filter.

ffmpeg -ss 13:25 -i "[Mazui]_Ore_No_Imouto_-_10v2_[9D348AB9].mkv" -t 4.25 -vf colormatrix=bt709:bt601,ass=subs.ass -sn -qmin 10 -qmax 10 -q:a 5 "gaki no anime.webm"

There are multiple ways of defining the Y'CbCr colors usually used in compressed video files in terms of RGB. Two common ones are BT.601 and BT.709. For details, read:

H.264 has a flag to indicate which colorspace definition is being used, but for stuff at resolutions of 720p and higher, it's usually BT.709. VP8 uses BT.601:

Unfortunately, it seems that many players (I tested MPC-HC and VLC) will display VP8 videos as if they were BT.709. But the browsers I tested (Firefox, Chrome, Opera) all use the correct colors.


File: 1385232788438.webm (611.98 KB, 1280x720, gaki no anime colors wron….webm)

For comparison, here's >>135 without the conversion.


Fortunately, as you can see, it's a relatively small difference. But it's worth knowing about.


What encode as done in the OP video?


You can read it on the first frame.


That's just to record it; it was then sped up and converted to VP8 with something like

ffmpeg -i capture.mkv -vf "setpts=0.5*PTS" -qmin 20 -qmax 20 capture.webm


File: 1385592285994.png (42.91 KB, 858x531, 1fG9IGR9_LiCAsADoSzXv8SLdi….png)

Here are some slides about the "constrained quality" mode of libvpx (-crf X -b:v Y). In their tests, they got better results than with constant-quantizer mode (-qmin X -qmax X).


Their example settings on slide 12 have the quality set rather low, so you'll probably want to tweak the parameters and see what works best.


File: 1386040139630.webm (277.93 KB, 292x388, out.webm)

just testing


File: 1386040285529.webm (792.49 KB, 1280x720, out.webm)


File: 1386040502151.webm (2.33 MB, 1280x720, out.webm)


File: 1386040808136.webm (2.01 MB, 1280x720, out.webm)

ffmpeg -ss 05:45.70 -i source.mkv -t 10 -sn -qmin 10 -qmax 10 out.webm


File: 1386591480457.png (1.98 KB, 333x69, buttons.png)

VirtualDub seems to be pretty convenient for doing this, but it requires a bit of setup. Also it's Windows only.

VirtualDub may not open your videos out of the box, but there's a plugin that will allow it to open anything you have DirectShow filters for. So install LAV Filters if you don't have it already. Then unzip


and place the appropriate DShowInputDriver.vdplugin file in your VirtualDub plugins folder.

Cutting in time involves using these buttons (see pic) to select the beginning and end of your clip, and choosing "Crop to selection" from the edit menu. For cropping, you use the Filters dialog in the Video menu. You have to add a "null transform," after which you can use the cropping dialog to select the region you want.

The last issue is saving the clips in WebM format. VirtualDub supports piping video data to external encoders. A guide to this can be found here:


So you can use FFmpeg to convert raw video and audio to VP8 + Vorbis in a WebM container. Here's a setup file which should get it working if you save it as webm.vdprof, edit the paths to ffmpeg and cmd, and import it into the External Encoders dialog:


Once you have this set up correctly, you can go to "File > Export > Using external encoder…" and select the option you want. I've included two settings; the q=10 one gives you higher quality but larger video files.


Update: I've been having trouble getting the DShowInputDriver plugin to work right with just LAV Filters. It seems to work okay with LAV Splitter + ffdshow-tryouts.

There's another plugin which is an ffmpeg wrapper, which seems to work a bit more reliably:

Currently, if you try to open a WebM file with it, it will tell you it's not a supported file type, but since ffmpeg obviously supports WebM, you can just change the file extension to one of the ones in the "supported" list, and it will work.

Depending on your version of Windows, you may find that the most recent version crashes, in which case you should install a previous version.

There's also a handy list of input plugins for VirtualDub here:


>choosing "Crop to selection" from the edit menu

it's not necessary to do this; you can just select the section you want and save it.


Here's a batch script to help set up output from VirtualDub. This generates a webm.vdprof file you can import into VirtualDub given the location of ffmpeg.



So, an updated setup guide:

1. Download VirtualDub from
and FFmpeg from

Extract the files and put them in your Program Files directory, or wherever you want to install them.

2. Download the FFmpeg input plugin for VirtualDub from

Unzip it and move the contents of the plugins32 directory (or plugins64 if you installed the 64-bit version of VirtualDub) to the plugins32 (or plugins64) directory in the copy of VirtualDub you just installed.

3. Download
and name it outputsetup.bat

Find ffmpeg.exe in the copy of FFmpeg you installed (it should be in the bin directory) and drag and drop it on outputsetup.bat. It should create a file named webm.vdprof. Open VirtualDub, go to Options > External Encoders… > Import…, and select this webm.vdprof file.


File: 1386833245298.png (1.23 MB, 1680x1023, rec709.png)

I should note that VirtualDub with the FFmpeg input plugin doesn't yet have the ability to tell whether a file is BT.709 or BT.601, and it will assume BT.601, which can lead to the problem discussed at >>135.

Fortunately, it's easy to correct this. If the input is BT.709, you can add an "alias format" filter to tell it that.

The left hand side is the video before filters (slightly wrong colors), and the right hand side is the video after filters (colors fixed and video cropped).


File: 1388806905028.webm (1.59 MB, 1280x720, kawaii.webm)

Made this as a test, I really like webm as opposed to gif. Much more compact yet offering more. Hope it becomes more popular.


File: 1388893943234.webm (2.85 MB, 1280x720, kek.webm)


The chrome in my iPad Isnt Running ;-;


boody pls


How do I include subtitles?


In ffmpeg you can use the ass filter for hardsubs. There's supposed to be a way to do softsubs in WebM (it's called WebVTT), but I haven't gotten it working, and I'm not sure which browsers support it.

In >>135 what I did was

[extract the fonts from the .mkv]
ffmpeg -dump_attachment:t "" -i "[Mazui]_Ore_No_Imouto_-_10v2_[9D348AB9].mkv"

[install fonts]
ffmpeg -ss 13:20 -i "[Mazui]_Ore_No_Imouto_-_10v2_[9D348AB9].mkv" -t 10 subs.ass

[edit subs.ass, subtract 0:13:25]

[transcode with hardsubs]
ffmpeg -ss 13:25 -i "[Mazui]_Ore_No_Imouto_-_10v2_[9D348AB9].mkv" -t 4.25 -vf colormatrix=bt709:bt601,ass=subs.ass -sn -qmin 10 -qmax 10 -q:a 5 "gaki no anime.webm"

I had some initial trouble getting the ass filter working properly on Windows. What worked for me was creating an [ffmpeg installation path]\bin\fonts\fonts.conf containing:


File: 1394511952766.png (15.96 KB, 591x182, Capture.PNG)

Sadly I couldn't get it to work.

I made the fonts.config. Extracted and installed the fonts.

I assume what you meant by 'Subtract' was re-time the subs, pic related.

I then used.
ffmpeg -ss 15:33 -i "Legend.of.the.Galactic.Heroes.039.[x264.720p.10bit.AAC].mkv" -t 21.46 -vf ass=subs.ass -sn -qmin 10 -qmax 10 -q:a 5 "alcholic.webm"

ffmpeg spits out an error and transcodes without including the subs.

>[parsed_ass_0 @ 00000000052e4c20] No usable fontconfig configuration file found, using fallback.


File: 1394513126316.webm (1.51 MB, 960x720, alcholic.webm)

Please disregard my stupidity. I had read 'fonts.conf' as 'fonts.config'


Here's a quick way to retime the subs when cutting:
($sourcefile, $starttime and $duration should be substituted with the values you want)

# After extracting and installing the fonts with something like
sourcefile=`readlink -f "$sourcefile"` # $sourcefile needs to contain the full path for this
mkdir -p ~/.fonts/tmp
pushd ~/.fonts/tmp
ffmpeg -dump_attachment:t "" -i "$sourcefile"

# and extracting the subs
ffmpeg -i "$sourcefile" subs.ass

# first create an intermediate version of the clip without subs (I'm assuming this is a BT.709 source, otherwise remove that filter)
ffmpeg -ss $starttime -i "$sourcefile" -t $duration -vf colormatrix=bt709:bt601 -c:v ffvhuff -c:a flac -sn clip.mkv

# and use -itsoffset to offset the timestamps in the intermediate clip so they match the subs:
ffmpeg -itsoffset $starttime -i clip.mkv -vf ass=subs.ass -qmin 10 -qmax 10 -q:a 5 clip.webm

# When you're done, you can delete the fonts you temporarily installed:
rm -r ~/.fonts/tmp


And it might be a good idea to replace
ffmpeg -itsoffset $starttime -i clip.mkv -vf ass=subs.ass -qmin 10 -qmax 10 -q:a 5 clip.webm

ffmpeg -itsoffset $starttime -i clip.mkv -vf ass=subs.ass -c:v ffvhuff -c:a copy clip2.mkv
ffmpeg -i clip2.mkv -qmin 10 -qmax 10 -q:a 5 clip.webm

so that the timestamps in the final file start from zero.


>ffmpeg -itsoffset $starttime -i clip.mkv -vf ass=subs.ass -c:v ffvhuff -c:a copy clip2.mkv
>ffmpeg -i clip2.mkv -qmin 10 -qmax 10 -q:a 5 clip.webm

Found a better way:

ffmpeg -itsoffset $starttime -i clip.mkv -vf ass=subs.ass,setpts=PTS-$starttime -qmin 10 -qmax 10 -q:a 5 clip.webm


File: 1396656827746.webm (610.18 KB, 1280x720, out.webm)



File: 1396702221265.webm (739.41 KB, 580x327, birdy2.webm)



File: 1396704917555.webm (1.82 MB, 480x270, Yozakura.webm)

This is beautiful.


File: 1396705323249.webm (1.75 MB, 854x480, [HorribleSubs] JoJo_s Biz….webm)


File: 1396705618452.webm (2.73 MB, 960x540, out.webm)


File: 1396706353597.webm (275.71 KB, 416x234, kek.webm)


File: 1396708746214.webm (2.67 MB, 738x554, Berserk Opening.webm)


File: 1396712209228.webm (287.61 KB, 416x234, HomuMami.webm)


File: 1396712542923.gif (2.98 MB, 416x234, HomuMami.gif)


File: 1396713377884.webm (1.11 MB, 480x270, Yozakura2.webm)


File: 1396714703955.webm (2.78 MB, 480x270, Jinrui.webm)


File: 1396715169703.webm (3.14 MB, 544x306, Zetsuen no Tempest Op 1 -….webm)


File: 1396715918568.webm (98.52 KB, 1081x608, suffer.webm)


File: 1396716267703.webm (753.05 KB, 720x405, suffer2.webm)


File: 1396717443118.webm (1.71 MB, 960x540, out.webm)



File: 1396720134456.webm (9.11 MB, 960x720, bluesub.webm)



is there a way to add a seperate audio track to a image or video if you wanted to? or is it limited to audio from video you are using?


Maybe if you add a vocaroo.
Would be neat if you could play both at once.


File: 1396724882955.webm (3.01 MB, 320x180, AMM1.webm)

Ai Mai Mi episode 1 with subtitles (for ants)


File: 1396726963374.webm (2.22 MB, 960x540, south_park.webm)


combine the video with the audio in windows movie maker.

also, I'm not too knowledgable bu I think you can combine multiple files with ffmpeg; if so you can just make the video with -an, and the audio with -vn, and combine the two.


may i ask for source?


File: 1396735658837.webm (3 MB, 640x360, SatsukiED.webm)


File: 1396736404937.webm (3.09 MB, 420x236, out4.webm)

Is there a way or a trick to make the edges look better in pannings?
Also best opening of all time and Noel is mai waifudonotsteal.


File: 1396737811127.webm (1.74 MB, 480x360, Gintoki's Kamehameha .webm)


File: 1396737975106.webm (1.81 MB, 853x480, 2.webm)


File: 1396739987907.webm (1.06 MB, 640x360, [GINTAMA] Kondo got stuck….webm)


Excellent, now this can finally be posted in "Your favorite OP/ED" threads.


File: 1396748935328.webm (3.03 MB, 361x203, out4.webm)


File: 1396751536098.webm (2.95 MB, 480x270, MikaShinED_4chan.webm)


File: 1396752843787.webm (2.98 MB, 480x270, MikaShinOP_4chan.webm)

Fixed the OP.


File: 1397912235790.png (113.89 KB, 829x716, 2014-04-19--1397912147_829….png)

Does anyone have an idea of why thumbnails don't work in Firefox, but in Chromium based browsers they do? It has something to do with the poster="/static/video.png" tag, but I'm not sure why that poster tag takes precedence in Firefox but not in Chromium, or how to instruct it to act otherwise.


Do you have an extension that blocks videos from autoplaying? Or perhaps an old version of Firefox?


File: 1397945533956.webm (8.14 MB, 1280x720, Nourin_ep02_How_Could_You.webm)



Yes, I do have ClickToPlay enabled under about:config, but as I understand that only applies to Flash and other plugins. I'm not really sure.


Someone on /tv/ asked if this stuff works on 4chan. Answer is that it should work if you strip the sound. You need the option -an for that.

Be aware that if you're running up against the file size limit, it's best to set the bitrate (-b:v) to the value you want, rather than using -crf or the -qmin 10 -qmax 10 thing. You should also use two passes when you do it this way. So you'd do something like

ffmpeg -ss 3:00 -i source.mkv -t 20 -b:v 3*1024*1024*8/20*.975 -quality best -an -sn -pass 1 -c:v libvpx -f null -
ffmpeg -ss 3:00 -i source.mkv -t 20 -b:v 3*1024*1024*8/20*.975 -quality best -an -sn -pass 2 output.webm


File: 1398897689816.webm (2.2 MB, 420x620, out.webm)


From what anime is this?


File: 1400418359904.webm (2.63 MB, 530x720, Ëmerald2.webm)

So what settings on VirtualDub would make the smallest file size while keeping the quality intact.
I keep making 9MB sized 10 second clips and I see these 5 minute long 1920x1080 resolution videos with like 2MB filesize. What am I doing wrong here?
Also, test.


If you want the smallest acceptable-quality file, you generally have to try a few different encoder settings.

But you are not going to get 5 minute long 1920x1080 resolution videos with like 2MB filesize without making the video look like shit.


Anyone know where this is from?


File: 1402696801865.webm (Spoiler Image, 869.34 KB, 1280x720, test.webm)

WebM Gui 1.1
Now every retard is able to make WebMs in HQ.
You dont have to deal with the ugly commando line annymore.
WebM made with the gui!


File: 1402787570354.webm (Spoiler Image, 869.29 KB, 1280x720, remux.webm)

For some reason this doesn't play in Firefox. Works after remuxing with ffmpeg (2.2.3), though.


Apparently recent versions of ffmpeg have started putting WebVTT subtitles in, which is causing issues with Firefox. Subtitles can be suppressed with the -sn option.


Can some one help me.
I have set the environmental variables:

FC_CONFIG_DIR=C:\Program Files\ffmpeg\fonts.conf
FC_CONFIG_FILE=C:\Program Files\ffmpeg\fonts.conf
FONTCONFIG_FILE=C:\Program Files\ffmpeg\fonts.conf

It worked once but now doesn't work. I keep get:
No usable fontconfig configuration file found, using fallback.


File: 1404780631065.webm (884.68 KB, 688x288, Animatrix Robohorse.webm)


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File: 1404782149296.webm (2.35 MB, 1920x1080, Battle Royale Excercise.webm)


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File: 1404782361648.webm (2.17 MB, 654x368, Battle Royale Excercise(1….webm)


File: 1404782482647.webm (2.49 MB, 1280x720, Florida man truck bomb.webm)


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File: 1404782717023.webm (2.61 MB, 1280x694, Ghost in a Shell.webm)


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File: 1404783435258.webm (2.3 MB, 853x480, Florida man truck bomb1.webm)

nigger faggot


File: 1404783723430.webm (2.92 MB, 853x480, Ghost in a Shell.webm)

nigger faggot



File: 1404783839878.webm (2.8 MB, 1280x720, Hellsing Familiar.webm)


nigger feget


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




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


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

hmm les see


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


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



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



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

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

what you think

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


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


Is this Tera?


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

Testing Webm


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


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





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

new test


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





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


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




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


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


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


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.


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







[spoiler] asdsadasd [/spoiler]


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



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