user12565: I am capturing games on my Windows 10 PC with Open Broadcast Software and x264 codec. My problem is that as soon as I import a video.mp4 file to iMovie or WindowsMovieMaker for editing, it is black, but has sound.
But when I watch it with Quicktime or Windows Video it works without a problem.
A while ago it worked - but I do not know if it was my upgrade from Windows 7 to Windows 10 or a newer version of OBS. 
Things i tried:

export it into .mov with Quicktime - didn't work - after rendering an non sense error message á la "did not work"
reset OBS settings
deinstall and install fresh OBS
download h264 codec on windows, but it's just an .exe file - dunno what to do with it

So what am I doing wrong? Do you have any questions or need informations to help me that I didn't provided yet?
Update: Tried to capture a game video with Windows 10s new game capture feature and Windows Movie Maker has same problem with this video as well. Black screen -.- 
Looks like OBS is not the problem.
Update 2: Here is the media info from one of my test files. It is recorded with OBS and saved to Fraps folder, it is not recorded with Fraps - but I guess that does not matter anyway.
General
Complete name                            : D:\Fraps\video.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 1.27 MiB
Duration                                 : 9s 499ms
Overall bit rate                         : 1 122 Kbps
Encoded date                             : UTC 2016-01-17 23:47:57
Tagged date                              : UTC 2016-01-17 23:47:57
Writing application                      : Open Broadcaster Software v0.657b

Video
ID                                       : 2
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Muxing mode                              : Container profile=High@3.1
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 9s 499ms
Source duration                          : 9s 466ms
Bit rate                                 : 1 000 Kbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 30.000 fps
Minimum frame rate                       : 29.412 fps
Maximum frame rate                       : 30.303 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.016
Stream size                              : 1.12 MiB (88%)
Source stream size                       : 1.12 MiB (88%)
Writing library                          : x264 core 146 r2538 121396c
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=12 / lookahead_threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=cbr / mbtree=1 / bitrate=1000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=1000 / vbv_bufsize=1000 / nal_hrd=none / filler=1 / ip_ratio=1.40 / aq=1:1.00
Encoded date                             : UTC 2016-01-17 23:47:57
Tagged date                              : UTC 2016-01-17 23:47:57
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : sYCC
Matrix coefficients                      : BT.709
mdhd_Duration                            : 9499

Audio
ID                                       : 1
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 9s 487ms
Source duration                          : 9s 429ms
Bit rate mode                            : Constant
Nominal bit rate                         : 128 Kbps
Channel(s)                               :  channel0
Channel(s)_Original                      : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Frame rate                               : 46.875 fps (1024 spf)
Compression mode                         : Lossy
Source stream size                       : 140 KiB (11%)
Language                                 : English
Encoded date                             : UTC 2016-01-17 23:47:57
Tagged date                              : UTC 2016-01-17 23:47:57

And this is recorded with Win10 Game Capture Feature:
General
Complete name                            : C:\Users\User\Videos\Captures\Sid Meier's ~ Pirates! 18.01.2016 01_08_40.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (mp41/isom)
File size                                : 7.06 MiB
Duration                                 : 30s 534ms
Overall bit rate                         : 1 941 Kbps
Movie name                               : Sid Meier's ~ Pirates!
Performer                                : Microsoft Game DVR
Encoded date                             : UTC 2016-01-18 00:08:40
Tagged date                              : UTC 2016-01-18 00:08:40
Xtra                                     : {64440492-4C8B-11D1-8B70-080036B11A03} 27

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L4.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 1 frame
Format settings, GOP                     : M=1, N=29
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 30s 522ms
Source duration                          : 30s 500ms
Bit rate                                 : 1 810 Kbps
Width                                    : 1 280 pixels
Height                                   : 960 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Variable
Frame rate                               : 30.000 fps
Minimum frame rate                       : 29.970 fps
Maximum frame rate                       : 30.030 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.049
Stream size                              : 6.58 MiB (93%)
Source stream size                       : 6.58 MiB (93%)
Encoded date                             : UTC 2016-01-18 00:08:40
Tagged date                              : UTC 2016-01-18 00:08:40
mdhd_Duration                            : 30522

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 30s 534ms
Source duration                          : 30s 534ms
Bit rate mode                            : Constant
Bit rate                                 : 128 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 44.1 KHz
Frame rate                               : 43.066 fps (1024 spf)
Compression mode                         : Lossy
Stream size                              : 481 KiB (7%)
Source stream size                       : 481 KiB (7%)
Encoded date                             : UTC 2016-01-18 00:08:40
Tagged date                              : UTC 2016-01-18 00:08:40
mdhd_Duration                            : 30534

Update 3: This is a screenshot of my Windows Movie Maker. Like you see at the left a black screen and at the right first image of the movie, but that's all. And kinda wired thing is that I have with iMovie same problem. So it can not be a codec problem on my Windows 10 PC, but all capture apps have the same problem, well or all video editors...

Update 4: Here is the media info of my .mkv file.
General
Unique ID                                : 242469772953486188448003563262617227499 (0xB669FAC94B0A3F6673840B2F750A90EB)
Complete name                            : C:\Users\User\Desktop\Neuer Ordner\Video-1.mkv
Format                                   : Matroska
Format version                           : Version 2
File size                                : 1.15 MiB
Duration                                 : 9s 566ms
Overall bit rate                         : 1 005 Kbps
Writing application                      : HandBrake 0.9.9
Writing library                          : libmkv 0.6.5

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L4
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 2 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 9s 567ms
Width                                    : 1 920 pixels
Height                                   : 1 476 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 30.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Writing library                          : x264 core 130 r2273 b3065e6
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=12 / lookahead_threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=20000 / vbv_bufsize=25000 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Language                                 : English
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : A_AAC
Duration                                 : 9s 566ms
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Frame rate                               : 46.875 fps (1024 spf)
Compression mode                         : Lossy
Language                                 : English
Default                                  : Yes
Forced                                   : No


user1871: The variable frame rate is all that stands out. Save future videos with constant frame rate. As for these ones, transcode using ffmpeg* to CFR MP4s:
ffmpeg -i currentvideo.mp4 -c:a copy -crf 16 -r 30 -fflags +genpts newvideo.mp4

*Get the 32-bit static build.

12565: <p>I am capturing games on my Windows 10 PC with <a href="https://obsproject.com/" rel="nofollow noreferrer">Open Broadcast Software</a> and x264 codec. My problem is that as soon as I import a video.mp4 file to iMovie or WindowsMovieMaker for editing, it is black, but has sound.</p>

<p>But when I watch it with Quicktime or Windows Video it works without a problem.</p>

<p>A while ago it worked - but I do not know if it was my upgrade from Windows 7 to Windows 10 or a newer version of OBS. </p>

<p>Things i tried:</p>

<ul>
<li>export it into .mov with Quicktime - didn't work - after rendering an non sense error message á la "did not work"</li>
<li>reset OBS settings</li>
<li>deinstall and install fresh OBS</li>
<li>download h264 codec on windows, but it's just an .exe file - dunno what to do with it</li>
</ul>

<p>So what am I doing wrong? Do you have any questions or need informations to help me that I didn't provided yet?</p>

<p><strong>Update</strong>: Tried to capture a game video with Windows 10s new game capture feature and Windows Movie Maker has same problem with this video as well. Black screen -.- 
Looks like OBS is not the problem.</p>

<p><strong>Update 2</strong>: Here is the media info from one of my test files. It is recorded with OBS and saved to Fraps folder, it is not recorded with Fraps - but I guess that does not matter anyway.</p>

<pre><code>General
Complete name                            : D:\Fraps\video.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 1.27 MiB
Duration                                 : 9s 499ms
Overall bit rate                         : 1 122 Kbps
Encoded date                             : UTC 2016-01-17 23:47:57
Tagged date                              : UTC 2016-01-17 23:47:57
Writing application                      : Open Broadcaster Software v0.657b

Video
ID                                       : 2
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Muxing mode                              : Container profile=High@3.1
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 9s 499ms
Source duration                          : 9s 466ms
Bit rate                                 : 1 000 Kbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 30.000 fps
Minimum frame rate                       : 29.412 fps
Maximum frame rate                       : 30.303 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.016
Stream size                              : 1.12 MiB (88%)
Source stream size                       : 1.12 MiB (88%)
Writing library                          : x264 core 146 r2538 121396c
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=12 / lookahead_threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=cbr / mbtree=1 / bitrate=1000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=1000 / vbv_bufsize=1000 / nal_hrd=none / filler=1 / ip_ratio=1.40 / aq=1:1.00
Encoded date                             : UTC 2016-01-17 23:47:57
Tagged date                              : UTC 2016-01-17 23:47:57
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : sYCC
Matrix coefficients                      : BT.709
mdhd_Duration                            : 9499

Audio
ID                                       : 1
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 9s 487ms
Source duration                          : 9s 429ms
Bit rate mode                            : Constant
Nominal bit rate                         : 128 Kbps
Channel(s)                               :  channel0
Channel(s)_Original                      : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Frame rate                               : 46.875 fps (1024 spf)
Compression mode                         : Lossy
Source stream size                       : 140 KiB (11%)
Language                                 : English
Encoded date                             : UTC 2016-01-17 23:47:57
Tagged date                              : UTC 2016-01-17 23:47:57
</code></pre>

<p>And this is recorded with <a href="https://support.xbox.com/de-DE/xbox-on-windows/social/record-game-clips-game-dvr-windows-10" rel="nofollow noreferrer">Win10 Game Capture Feature</a>:</p>

<pre><code>General
Complete name                            : C:\Users\User\Videos\Captures\Sid Meier's ~ Pirates! 18.01.2016 01_08_40.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (mp41/isom)
File size                                : 7.06 MiB
Duration                                 : 30s 534ms
Overall bit rate                         : 1 941 Kbps
Movie name                               : Sid Meier's ~ Pirates!
Performer                                : Microsoft Game DVR
Encoded date                             : UTC 2016-01-18 00:08:40
Tagged date                              : UTC 2016-01-18 00:08:40
Xtra                                     : {64440492-4C8B-11D1-8B70-080036B11A03} 27

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L4.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 1 frame
Format settings, GOP                     : M=1, N=29
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 30s 522ms
Source duration                          : 30s 500ms
Bit rate                                 : 1 810 Kbps
Width                                    : 1 280 pixels
Height                                   : 960 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Variable
Frame rate                               : 30.000 fps
Minimum frame rate                       : 29.970 fps
Maximum frame rate                       : 30.030 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.049
Stream size                              : 6.58 MiB (93%)
Source stream size                       : 6.58 MiB (93%)
Encoded date                             : UTC 2016-01-18 00:08:40
Tagged date                              : UTC 2016-01-18 00:08:40
mdhd_Duration                            : 30522

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 30s 534ms
Source duration                          : 30s 534ms
Bit rate mode                            : Constant
Bit rate                                 : 128 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 44.1 KHz
Frame rate                               : 43.066 fps (1024 spf)
Compression mode                         : Lossy
Stream size                              : 481 KiB (7%)
Source stream size                       : 481 KiB (7%)
Encoded date                             : UTC 2016-01-18 00:08:40
Tagged date                              : UTC 2016-01-18 00:08:40
mdhd_Duration                            : 30534
</code></pre>

<p><strong>Update 3</strong>: This is a screenshot of my Windows Movie Maker. Like you see at the left a black screen and at the right first image of the movie, but that's all. And kinda wired thing is that I have with iMovie same problem. So it can not be a codec problem on my Windows 10 PC, but all capture apps have the same problem, well or all video editors...</p>

<p><a href="https://i.stack.imgur.com/dmzOY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dmzOY.png" alt="Windows Movie Maker Screenshot"></a></p>

<p><strong>Update 4</strong>: Here is the media info of my .mkv file.</p>

<pre><code>General
Unique ID                                : 242469772953486188448003563262617227499 (0xB669FAC94B0A3F6673840B2F750A90EB)
Complete name                            : C:\Users\User\Desktop\Neuer Ordner\Video-1.mkv
Format                                   : Matroska
Format version                           : Version 2
File size                                : 1.15 MiB
Duration                                 : 9s 566ms
Overall bit rate                         : 1 005 Kbps
Writing application                      : HandBrake 0.9.9
Writing library                          : libmkv 0.6.5

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L4
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 2 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 9s 567ms
Width                                    : 1 920 pixels
Height                                   : 1 476 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 30.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Writing library                          : x264 core 130 r2273 b3065e6
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=12 / lookahead_threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=20000 / vbv_bufsize=25000 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Language                                 : English
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : A_AAC
Duration                                 : 9s 566ms
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Frame rate                               : 46.875 fps (1024 spf)
Compression mode                         : Lossy
Language                                 : English
Default                                  : Yes
Forced                                   : No
</code></pre>
 1871: <p>The variable frame rate is all that stands out. Save future videos with constant frame rate. As for these ones, transcode using <a href="http://ffmpeg.zeranoe.com/builds/" rel="nofollow">ffmpeg</a>* to CFR MP4s:</p>

<pre><code>ffmpeg -i currentvideo.mp4 -c:a copy -crf 16 -r 30 -fflags +genpts newvideo.mp4
</code></pre>

<p>*Get the 32-bit static build.</p>
