Output video playback speed too high

[carlwain74]

I'm noticing that when I stream video the output is somewhat accelerated compared to the original.

Are there settings that can control this or is this just an artifact of ffmpeg conversion?

Output from execution:

BeetleJuice:Sample Video cwainwright$ docker run --rm -p 9998:9998/udp -v "$PWD":/mnt eyevinntechnology/toolbox-loopts IN.mp4 udp://host.docker.internal:9998?pkt_size=1316 --withtc --framerate 30
ffmpeg version N-93394-g14eea7c Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-27ubuntu118.04)
configuration: --pkg-config-flags=--static --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-libaom --enable-libdav1d --enable-libvpx --enable-libsrt --enable-libx265 --enable-libfreetype --enable-version3 --enable-nonfree
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 47.103 / 58. 47.103
libavformat 58. 26.101 / 58. 26.101
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
ffmpeg version N-93394-g14eea7c Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-27ubuntu118.04)
configuration: --pkg-config-flags=--static --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-libaom --enable-libdav1d --enable-libvpx --enable-libsrt --enable-libx265 --enable-libfreetype --enable-version3 --enable-nonfree
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 47.103 / 58. 47.103
libavformat 58. 26.101 / 58. 26.101
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/mnt/IN.mp4':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 2019-09-27T21:54:50.000000Z
title : Media Presentation
encoder : HandBrake 1.2.2 2019022300
Duration: 00:10:00.00, start: 0.000000, bitrate: 23548 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 23547 kb/s, 15 fps, 15 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2019-09-27T21:54:50.000000Z
handler_name : VideoHandler
Output #0, h264, to 'pipe:':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : Media Presentation
encoder : Lavf58.26.101
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 23547 kb/s, 15 fps, 15 tbr, 90k tbn, 90k tbc (default)
Metadata:
creation_time : 2019-09-27T21:54:50.000000Z
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[h264 @ 0x5614976989c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, h264, from 'pipe:':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 90k tbr, 1200k tbn, 180k tbc
Input #1, lavfi, from 'anullsrc=r=48000:cl=stereo':
Duration: N/A, start: 0.000000, bitrate: 768 kb/s
Stream #1:0: Audio: pcm_u8, 48000 Hz, stereo, u8, 768 kb/s
Stream mapping:
Stream #0:0 (h264) -> drawtext (graph 0)
scale (graph 0) -> Stream #0:0 (libx264)
Stream #1:0 -> #0:1 (pcm_u8 (native) -> aac (native))
[libx264 @ 0x5614976c0fc0] using SAR=1/1
[libx264 @ 0x5614976c0fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5614976c0fc0] profile High, level 3.1
Output #0, mpegts, to 'udp://host.docker.internal:9998?pkt_size=1316':
Metadata:
encoder : Lavf58.26.101
Stream #0:0: Video: h264 (libx264), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 90k tbn, 30 tbc
Metadata:
encoder : Lavc58.47.103 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.47.103 aac
[h264 @ 0x5614976989c0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 512)

[carlwain74]

So I tried on a Windows machine and playback was smooth. The original issue was reported when I was streaming on my MacBook Pro.