CRITICAL: Monibuca Alters FPS from 60 FPS to 62.5 FPS #88
Description
Description:
I've recently run into an issue with the Monibuca streaming server while streaming a 60 FPS video file named frame_counter_4k_60fps.flv. I used the following FFmpeg command to stream the video:
ffmpeg -re -i /ramdisk/frame_counter_4k_60fps.flv -c copy -f flv rtmp://127.0.0.1/app/hello123Input #0, flv, from '/ramdisk/frame_counter_4k_60fps.flv':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf59.16.100
Duration: 00:01:00.04, start: 0.019000, bitrate: 658 kb/s
Stream #0:0: Video: h264 (High), yuv420p(progressive), 3840x2160 [SAR 1:1 DAR 16:9], 640 kb/s, 60 fps, 60 tbr, 1k tbn
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 2 kb/s
Output #0, flv, to 'rtmp://127.0.0.1/app/hello123':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.3.100
Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), yuv420p(progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 640 kb/s, 60 fps, 60 tbr, 1k tbn
Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, fltp, 2 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)When I attempted to play back the RTMP stream using:
ffmpeg -i rtmp://127.0.0.1/app/hello123 Duration: N/A, start: 0.013000, bitrate: N/A
Stream #0:0: Video: h264 (High), yuv420p(progressive), 3840x2160 [SAR 1:1 DAR 16:9], 62.50 fps, 60 tbr, 1k tbn
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltpor through the HTTP MP4 URL:
http://127.0.0.1:8080/fmp4/app/hello123.mp4
I observed that the output video's frame rate was altered to 62.5 FPS.
For reference, here are some observations:
- Original 60 FPS was changed to 62.5 FPS.
- Original 29.97 FPS was altered to 30.30 FPS.
- Original 30 FPS was also altered to 30.30 FPS.
Moreover, I've also noticed that both the FPS (frames per second) and TBR (target bitrate) values are modified in the output video.
I've attached both the
- Sample input file (frame_counter_4k_60fps.flv.zip).
- Screenshot or log output from FFmpeg indicating the changed frame rate.
Expected Behaviour:
The Monibuca streaming server should retain the original frame rate and TBR values of the input video without modifying them.
Actual Behaviour:
The server changes the frame rate and TBR values during streaming.
Steps to Reproduce:
- Stream the file
frame_counter_4k_60fps.flvusing the provided FFmpeg command. - Playback the RTMP stream using FFmpeg with the provided command.
- Observe the altered frame rate and TBR values.
I'd appreciate any guidance or resolution on this matter.