10000 MP4Box change input framerate to 25 fps · Issue #2562 · gpac/gpac · GitHub
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MP4Box change input framerate to 25 fps #2562

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wtuemura opened this issue Aug 20, 2023 · 4 comments
Closed

MP4Box change input framerate to 25 fps #2562

wtuemura opened this issue Aug 20, 2023 · 4 comments

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@wtuemura
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Tested with: GPAC version 2.2.1-rev0-gb34e3851-release-2.2, GPAC version 2.3-DEV-rev478-g89285266-master

Sample: https://anonymfile.com/560bg/video1440.7z

x264 command to encode sample: x264-r3107-a8b68eb.exe --preset fast --output-csp i422 --sar 1:1 --bframes 2 --crf 17 --keyint 30 --no-interlaced --videoformat component --output VIDEO1440.h264 mame-1440.avs

ffprobe info: ffprobe -i VIDEO1440.h264 -hide_banner -probesize 10M
Output:

Input #0, h264, from 'VIDEO1440.h264':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (High 4:2:2), yuv422p(tv, smpte170m/bt709/bt709, progressive), 1920x1440 [SAR 1:1 DAR 4:3], 59 fps, 59.19 tbr, 1200k tbn

MP4Box mux command: mp4box -add "VIDEO1440.h264" -new "file.mp4"
Output:

Track Importing MPEG-4 AVC - Width 1920 Height 1440 FPS 25000/1000 SAR 1/1
AVC|H264 Import results: 3552 samples (3791 NALUs) - Slices: 119 I 1226 P 2207 B - 1 SEI - 119 IDR - 0 CRA
AVC|H264 Stream uses forward prediction - stream CTS offset: 2 frames
@jeanlf
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jeanlf commented Aug 31, 2023

test file is not working, could you reupload ?

It looks like the input bitstream does not have any FPS info.

25 fps is the default framerate when importing content with no FPS info in the bitstream, use -add SRC:fps=N/D if needed.

Will reopen if you can upload faulty content

@jeanlf jeanlf closed this as completed Aug 31, 2023
@wtuemura
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Hi @jeanlf thank for looking into it.

Here is the file.

Thanks.

@wtuemura
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wtuemura commented Sep 2, 2023

Hi @jeanlf
Google blocked the download for some reason, link fixed.
Thank you.

jeanlf added a commit that referenced this issue Sep 2, 2023
@jeanlf
fixed FPS detection for very large values of VUI timescale - cf #2562
640106c
@jeanlf
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jeanlf commented Sep 2, 2023

indeed this was due to a very large value in vui timescale, now fixed - thanks for the file!

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@jeanlf @wtuemura
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