The VideoLAN Forums • Frame rate setting gives strange results (H264)

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Frame rate setting gives strange results (H264)

Posted: 16 May 2012 16:42

by gewoonPieter

I made a script where I changed the Frame rate each time. To my surprise the size of the files didn't look right. After analyzing the files, there seemed to be something wrong. Could you advice me on this issue?
I used vlc 2.0.0 to convert avi to mp4 (H264)

Here's my script:

Code: Select all

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="5",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_005.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="10",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_010.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="15",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_015.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="20",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_020.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="25",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_025.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="30",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_030.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="32",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_032.mp4"} vlc://quit
"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="40",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_040.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="50",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_050.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="60",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_060.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="70",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_070.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="80",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_080.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="90",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_090.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="100",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_100.mp4"} vlc://quit

"c:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv -L --no-loop "c:\Temp\scopeTest\voorTom\scope_AM1_734921_5.avi" --sout=#transcode{vcodec="h264",fps="120",vb="3000",scale="1"}:standard{access=file,dst="c:\Temp\scopeTest\voorTom\test6\test_3000kbps_120.mp4"} vlc://qui

These are the files that came out. As you can see, the size decreases when the frame rate (value before the .mp4) becomes higher. This is not what I expected.

Code: Select all

16-May-12  04:06 PM        50,306,232 test_3000kbps_005.mp4
16-May-12  04:06 PM        13,946,841 test_3000kbps_010.mp4
16-May-12  04:06 PM         5,948,024 test_3000kbps_015.mp4
16-May-12  04:07 PM         5,897,929 test_3000kbps_020.mp4 
16-May-12  04:07 PM         5,891,828 test_3000kbps_025.mp4 
16-May-12  04:08 PM         5,903,389 test_3000kbps_030.mp4
16-May-12  04:08 PM         5,903,030 test_3000kbps_032.mp4 
16-May-12  04:09 PM         5,862,968 test_3000kbps_040.mp4
16-May-12  04:09 PM         5,863,113 test_3000kbps_050.mp4 
16-May-12  04:10 PM         5,847,234 test_3000kbps_060.mp4
16-May-12  04:11 PM         7,406,602 test_3000kbps_070.mp4
16-May-12  04:11 PM         6,469,768 test_3000kbps_080.mp4
16-May-12  04:00 PM         5,725,062 test_3000kbps_090.mp4
16-May-12  04:00 PM         5,266,648 test_3000kbps_100.mp4
16-May-12  04:01 PM         4,284,841 test_3000kbps_120.mp4

The next info came from checking the files with SMPlayer:

Code: Select all

File test_3000kbps_005.mp4
Size 49127 KB (47 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 25932 kbps
Frames per second 59.940
Selected codec ffh264

Code: Select all

File test_3000kbps_010.mp4
Size 13619 KB (13 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 7188 kbps
Frames per second 12.000
Selected codec ffh264

Code: Select all

File test_3000kbps_015.mp4
Size 5808 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3062 kbps
Frames per second 15.000
Selected codec ffh264

Code: Select all

File test_3000kbps_020.mp4
Size 5759 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3033 kbps
Frames per second 20.000
Selected codec ffh264

Code: Select all

File test_3000kbps_025.mp4
Size 5753 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3028 kbps
Frames per second 25.000
Selected codec ffh264

Code: Select all

File test_3000kbps_030.mp4
Size 5765 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3037 kbps
Frames per second 30.000
Selected codec ffh264

Code: Select all

File test_3000kbps_032.mp4
Size 5764 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3031 kbps
Frames per second 32.000
Selected codec ffh264

Code: Select all

File test_3000kbps_040.mp4
Size 5725 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3014 kbps
Frames per second 40.000
Selected codec ffh264

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File test_3000kbps_050.mp4
Size 5725 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3012 kbps
Frames per second 50.050
Selected codec ffh264

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File test_3000kbps_060.mp4
Size 5710 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3009 kbps
Frames per second 59.940
Selected codec ffh264

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File test_3000kbps_070.mp4
Size 7233 KB (7 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3823 kbps
Frames per second 70.000
Selected codec ffh264

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File test_3000kbps_080.mp4
Size 6318 KB (6 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 3332 kbps
Frames per second 80.000
Selected codec ffh264

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File test_3000kbps_090.mp4
Size 5590 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 2962 kbps
Frames per second 90.000
Selected codec ffh264

Code: Select all

File test_3000kbps_100.mp4
Size 5143 KB (5 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 2711 kbps
Frames per second 100.000
Selected codec ffh264

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File test_3000kbps_120.mp4
Size 4184 KB (4 MB)
Length 00:00:15
Demuxer lavfpref

Video
Demuxer 800 x 480
Aspect ratio 1.6667
Format H264
Bitrate 2209 kbps
Frames per second 120.000
Selected codec ffh264

Re: Frame rate setting gives strange results (H264)

Posted: 09 Jun 2012 03:52

by djsashaz

Did you ever solve this? I have the exact same problem, but im doing live stream. No matter what settings I try I get 50fps or 59.94

I was reading that it had something to do with interlaced source and deinterlaced source, but regardless which I use, I get this same output.