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• FPS from RTSP stream info does not match actual framerate

  17 mai 2021, par Krapow

  I have a 25FPS RTSP stream coming from an IP-camera. I can successfully display the video stream. But when analyzing the stream with ffmpeg (ffprobe actually), I observe fewer frames per second rate :

  


  $ ffprobe -rtsp_transport tcp -i rtsp://camera_ip:554/stream -select_streams v:0 -show_frames -show_entries frame=coded_picture_number,pkt_pts_time -of csv=p=0
Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 640x480, 25 fps, 25 tbr, 90k tbn, 50 tbc
0.400000,0
0.080000,1
0.120000,2
0.200000,3
0.240000,4
0.320000,5
0.360000,6
0.440000,7
0.480000,8
0.560000,9
0.600000,10
0.680000,11
0.720000,12
0.800000,13
0.840000,14
0.920000,15
0.960000,16
1.040000,17
1.080000,18
1.160000,19
1.200000,20
1.280000,21
1.320000,22
1.400000,23
1.440000,24
1.520000,25
1.560000,26
1.640000,27
1.680000,28
1.760000,29
1.800000,30
1.880000,31
1.920000,32
2.000000,33


  


  We can clearly see the 80ms gap between some of the frames, resulting in a 16fps stream.

  


  I have observed the same framerate issue with GStreamer (printing information in the rtpjitterbuffer indicates the frame gap is sometimes 80ms and sometimes 40ms). But the weird thing is, I encountered the same issue with an HDMI-RJ45 decoder, and I doubt the same issue comes from 2 different devices.
I didn't get much more informations using -loglevel debug or trace.
Does anybody have an idea about what is going wrong in the stream ?

  


  (I used ffprobe 4.2.3 and the last "2021-05-09-git-8649f5dca6-full_build-www.gyan.dev" with the same results, and GStreamer 1.16.2 with a pipeline like "urisourcebin ! h264depay ! h264parse ! fakesink")

  


  EDIT : The camera skipping of frames was caused by the activation of a third stream in the options. I find it really weird that it skips exactly the same frames every seconds. However, I still haven't found the cause of the downrate on my RTSP encoder.
Anyway, this was actually hardware related and not software related.

  


• Timestamp not printed on thumbnails with FFMPEG

  26 août 2021, par mlatelcom

  I have a script using FFMPEG to generate an image with tiled thumbnails every 45 seconds for several videos on a given folder. The images are named with the name of the video it was generated from. It generates the thumbnails for each video but it does not print the time stamps on them. The path to the font file is correct ; so I don't know where the issue is. I'm using the script in Fedora Linux.

  


  Here is the FFMPEG command line code on the script :

  


   ffmpeg -ss 00:00:05 -i test.mp4 -loglevel 40 -frames 1 -bt 20M -vf "drawtext=fontfile=/usr/share/fonts/open-sans/OpenSans-Light.ttf:timecode='00\\:00\\:00\\:00':r=30:fontcolor=white:x=220:y=220:box=1:boxcolor=black@0.5,select=not(mod(n\,1350)),scale=200:150,tile=15x48" -n "${name}.png"


  


  and this is the console output

  


  ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (GCC)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' -I/usr/include/rav1e' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librav1e --enable-libsmbclient --enable-version3 --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-version3 --enable-vapoursynth --enable-libvpx --enable-vulkan --enable-libglslang --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzimg --enable-libzvbi --enable-lv2 --enable-avfilter --enable-avresample --enable-libmodplug --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-lto --enable-libmfx --enable-runtime-cpudetect
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[h264 @ 0x56051b4b3cc0] Reinit context to 1280x720, pix_fmt: yuv420p
[mpegts @ 0x56051b4acc80] max_analyze_duration 5000000 reached at 5000000 microseconds st:0
Input #0, mpegts, from 'test.mp4':
  Duration: 00:04:57.02, start: 1.400000, bitrate: 2853 kb/s
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Video: h264 (Main), 1 reference frame ([27][0][0][0] / 0x001B), yuv420p(progressive, left), 1280x720 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn, 60 tbc
  Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 96 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
[h264 @ 0x56051ba69e00] Reinit context to 1280x720, pix_fmt: yuv420p
[Parsed_scale_2 @ 0x56051b5953c0] w:200 h:150 flags:'bicubic' interl:0
[graph 0 input from stream 0:0 @ 0x56051b725ac0] w:1280 h:720 pixfmt:yuv420p tb:1/90000 fr:30/1 sar:1/1
[Parsed_scale_2 @ 0x56051b5953c0] w:1280 h:720 fmt:yuv420p sar:1/1 -> w:200 h:150 fmt:rgb24 sar:4/3 flags:0x4
Output #0, image2, to '.png':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: png, 1 reference frame, rgb24(pc, progressive, left), 3000x7200 (0x0) [SAR 4:3 DAR 5:9], q=2-31, 200 kb/s, 0.04 fps, 0.04 tbn
    Metadata:
      encoder         : Lavc58.134.100 png
No more output streams to write to, finishing.00.00 bitrate=N/A speed=   0x    
[AVIOContext @ 0x56051b84c8c0] Statistics: 0 seeks, 2 writeouts
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:24.00 bitrate=N/A speed=0.47x    
video:465kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (test.mp4):
  Input stream #0:0 (video): 8761 packets read (96159422 bytes); 8760 frames decoded; 
  Input stream #0:1 (audio): 0 packets read (0 bytes); 
  Total: 8761 packets (96159422 bytes) demuxed
Output file #0 (.png):
  Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (476224 bytes); 
  Total: 1 packets (476224 bytes) muxed
[AVIOContext @ 0x56051b4b5d00] Statistics: 107090352 bytes read, 18 seeks


  


• ffmpeg regenerate m3u8 from multi ts file

  17 juin 2021, par Mulham Aryan

  I have generated hls videos using FFmpeg with output m3u8.
m3u8 file content

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:1
#EXTINF:2.400000,
ffmpegmovie1.ts
#EXTINF:2.400000,
ffmpegmovie2.ts
#EXTINF:2.400000,
ffmpegmovie3.ts
#EXTINF:2.400000,
ffmpegmovie4.ts
#EXTINF:2.400000,
ffmpegmovie5.ts
#EXTINF:2.400000,
ffmpegmovie6.ts
#EXTINF:2.400000,
ffmpegmovie7.ts
#EXTINF:2.400000,
ffmpegmovie8.ts
#EXTINF:2.400000,
ffmpegmovie9.ts
#EXTINF:2.400000,
ffmpegmovie10.ts


  


  so let suppose that I'm going to take only files from 1 to 5
the m3u8 file should be like this

  


  #EXTM3U
    #EXT-X-VERSION:3
    #EXT-X-TARGETDURATION:2
    #EXT-X-MEDIA-SEQUENCE:1
    #EXTINF:2.400000,
    ffmpegmovie1.ts
    #EXTINF:2.400000,
    ffmpegmovie2.ts
    #EXTINF:2.400000,
    ffmpegmovie3.ts
    #EXTINF:2.400000,
    ffmpegmovie4.ts
    #EXTINF:2.400000,
    ffmpegmovie5.ts


  


  so the question is : is there any command from FFmpeg lets me input multiple ts files and get an output in m3u8 ?
example

  


  ffmpeg -i ffmpegmovie1.ts, ffmpegmovie2.ts, ffmpegmovie3.ts, .... >> output.m3u8