No video after export, only sound

ekrause77

ekrause77

n3wb
Sep 3, 2017
10
1
After I try to export a clip to avi or mp4, I get the sound but no video. I'll attach a screenshot of the settings.
 

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Did this ever get fixed as I'm having the same issue when exporting to MP4, whilst exporting to WMV works ok, albeit very slowly!

I noticed that sometimes the MP4's will play but that the video is black with audio playing. After checking the files with MediaInfo I can see that it has created a file with 2 video streams, the first of which is empty, hence no video on playback. If whilst playing this in VLC I right click, I can select the second video stream and then can see the recorded video.

Why is BI creating an MP4 with 2 video streams?

Output from MediaInfo:

General
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/iso6/mp41)
File size : 6.16 MiB
Duration : 57 s 369 ms
Overall bit rate : 900 kb/s
Writing application : Lavf57.71.100

Video #1
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Width : 1 440 pixels
Height : 2 560 pixels
Display aspect ratio : 0.563
Codec configuration box : avcC

Video #2
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L5
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, RefFrames : 1 frame
Format settings, GOP : M=1, N=120
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 57 s 369 ms
Bit rate : 866 kb/s
Width : 1 440 pixels
Height : 2 560 pixels
Display aspect ratio : 0.563
Frame rate mode : Variable
Frame rate : 13.980 FPS
Minimum frame rate : 0.252 FPS
Maximum frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.017
Stream size : 5.92 MiB (96%)
Writing library : H.264/MPEG-4 AVC codec
Default : No
Codec configuration box : avcC

Audio
ID : 3
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 53 s 504 ms
Bit rate mode : Constant
Bit rate : 33.1 kb/s
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 16.0 kHz
Frame rate : 15.625 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 216 KiB (3%)
Default : Yes
Alternate group : 1
 
GrahamH said:
Did this ever get fixed as I'm having the same issue when exporting to MP4, whilst exporting to WMV works ok, albeit very slowly!

I noticed that sometimes the MP4's will play but that the video is black with audio playing. After checking the files with MediaInfo I can see that it has created a file with 2 video streams, the first of which is empty, hence no video on playback. If whilst playing this in VLC I right click, I can select the second video stream and then can see the recorded video.

Why is BI creating an MP4 with 2 video streams?

Output from MediaInfo:

General
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/iso6/mp41)
File size : 6.16 MiB
Duration : 57 s 369 ms
Overall bit rate : 900 kb/s
Writing application : Lavf57.71.100

Video #1
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Width : 1 440 pixels
Height : 2 560 pixels
Display aspect ratio : 0.563
Codec configuration box : avcC

Video #2
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L5
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, RefFrames : 1 frame
Format settings, GOP : M=1, N=120
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 57 s 369 ms
Bit rate : 866 kb/s
Width : 1 440 pixels
Height : 2 560 pixels
Display aspect ratio : 0.563
Frame rate mode : Variable
Frame rate : 13.980 FPS
Minimum frame rate : 0.252 FPS
Maximum frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.017
Stream size : 5.92 MiB (96%)
Writing library : H.264/MPEG-4 AVC codec
Default : No
Codec configuration box : avcC

Audio
ID : 3
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 53 s 504 ms
Bit rate mode : Constant
Bit rate : 33.1 kb/s
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 16.0 kHz
Frame rate : 15.625 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 216 KiB (3%)
Default : Yes
Alternate group : 1
Click to expand...
uncheck re-encode if you have it checked like in the OP.
 
Thanks for your quick response but that doesn't really solve the problem as the purpose of re-encoding is to reduce the file size of the export and allow footage to be retained for longer. The solution really is to fix encoding so that it doesn't add the extra empty video stream otherwise what is the point of even having the re-encode checkbox?
 
GrahamH said:
Thanks for your quick response but that doesn't really solve the problem as the purpose of re-encoding is to reduce the file size of the export and allow footage to be retained for longer. The solution really is to fix encoding so that it doesn't add the extra empty video stream otherwise what is the point of even having the re-encode checkbox?
Click to expand...
Its all part of troubleshooting. You dont even mention if doing so solves your problem. Guess you dont have time for all that. For the record, I can export and re-encode to mp4 with no issues and playback is fine. So we know the issue is on your end. Since you seem to have diagnosed the "problem" and already know the solution, why dont you simply email the blue iris developer and enlighten him about this non existent problem. :rolleyes:
 
Last edited:
Yes, doing so does solve the problem as it doesn't re-encode, but I end up with a much larger which hasn't been rotated (as I need for this stream) and doesn't have text overlays applied. I don't just pay for a license, I'm happy also to provide any additional information that can help diagnose and fix the problem. This is running on a clean install of Windows 10 Pro 64-bit with latest updates and the latest version of BI (4.8.2.1.x64). Nothing else runs on this machine.

Have you checked your MP4's with MediaInfo to see if there are 2 video streams? What other info / troubleshooting would be helpful?
 
GrahamH said:
Yes, doing so does solve the problem as it doesn't re-encode, but I end up with a much larger which hasn't been rotated (as I need for this stream) and doesn't have text overlays applied. I don't just pay for a license, I'm happy also to provide any additional information that can help diagnose and fix the problem. This is running on a clean install of Windows 10 Pro 64-bit with latest updates and the latest version of BI (4.8.2.1.x64). Nothing else runs on this machine.

Have you checked your MP4's with MediaInfo to see if there are 2 video streams? What other info / troubleshooting would be helpful?
Click to expand...
What does "i just dont pay for a license" mean?
 
It means I'd like to help make the software better by helping in whatever ever way I can - I don't just buy and demand it be improved.
 
Try installing the k-lite codec pack. Beware of bundled apps you don't want though.

I haven't seen this particular problem before but that codec pack solves several other problems with BI's mp4 handling so it is worth a shot.
 
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