当摄像头设备分辨率为1920x1080时，tbr帧率识别错误？ #43

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opened 2025-12-23 10:31:30 +01:00 by backuprepo · 1 comment

backuprepo commented

2025-12-23 10:31:30 +01:00

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Originally created by @floydelcy on GitHub (Apr 3, 2024).

Hi,nyanmisaka

我在推流摄像头设备时发现当/dev/video0的分辨率为1920x1080时，ffprobe出帧率为1000k tbr，提示increasing probesize，导致没有输出，设置为1280x720时ffprobe帧率为 59.94 tbr，正常输出
v4l2-ctl -d /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat='NV12'

./dev/ffmpeg/ffmpeg  -i /dev/video0  -c:v h264_rkmpp -payload_type 126 -f rtp udp://127.0.0.1:8004
ffmpeg version ba84e56 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --enable-gpl --enable-version3 --enable-libdrm --enable-rkmpp --enable-rkrga
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100
[video4linux2,v4l2 @ 0x55a6fcac70] ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device
[video4linux2,v4l2 @ 0x55a6fcac70] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device
[video4linux2,v4l2 @ 0x55a6fcac70] Time per frame unknown
[video4linux2,v4l2 @ 0x55a6fcac70] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 1371.892581, bitrate: N/A
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 1000k tbr, 1000k tbn

Originally created by @floydelcy on GitHub (Apr 3, 2024). Hi,nyanmisaka 我在推流摄像头设备时发现当/dev/video0的分辨率为1920x1080时，ffprobe出帧率为1000k tbr，提示increasing probesize，导致没有输出，设置为1280x720时ffprobe帧率为 59.94 tbr，正常输出 v4l2-ctl -d /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat='NV12' ```bash ./dev/ffmpeg/ffmpeg -i /dev/video0 -c:v h264_rkmpp -payload_type 126 -f rtp udp://127.0.0.1:8004 ffmpeg version ba84e56 Copyright (c) 2000-2023 the FFmpeg developers built with gcc 12 (Debian 12.2.0-14) configuration: --prefix=/usr --enable-gpl --enable-version3 --enable-libdrm --enable-rkmpp --enable-rkrga libavutil 58. 29.100 / 58. 29.100 libavcodec 60. 31.102 / 60. 31.102 libavformat 60. 16.100 / 60. 16.100 libavdevice 60. 3.100 / 60. 3.100 libavfilter 9. 12.100 / 9. 12.100 libswscale 7. 5.100 / 7. 5.100 libswresample 4. 12.100 / 4. 12.100 libpostproc 57. 3.100 / 57. 3.100 [video4linux2,v4l2 @ 0x55a6fcac70] ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device [video4linux2,v4l2 @ 0x55a6fcac70] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device [video4linux2,v4l2 @ 0x55a6fcac70] Time per frame unknown [video4linux2,v4l2 @ 0x55a6fcac70] Stream #0: not enough frames to estimate rate; consider increasing probesize Input #0, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 1371.892581, bitrate: N/A Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 1000k tbr, 1000k tbn ```

backuprepo

2025-12-23 10:31:30 +01:00

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backuprepo commented

2025-12-23 10:31:32 +01:00

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@nyanmisaka commented on GitHub (Apr 3, 2024):

No one can guarantee that the framerate from the probing results of ffmpeg/ffprobe is completely accurate. When it's not accurate, you have to set it manually.

Closing as this is not an issue of MPP/RGA components.

@nyanmisaka commented on GitHub (Apr 3, 2024): No one can guarantee that the framerate from the probing results of ffmpeg/ffprobe is completely accurate. When it's not accurate, you have to set it manually. Closing as this is not an issue of MPP/RGA components.