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• Using Qt Media Player on Raspberry Pi 1

  18 mai 2015, par Mauker

  I have a project built using Qt5 which has to play a video. Just like in the videowidget sample code.

  I’ve followed these instructions to build qt5 on my Pi. And it went just fine. But when I try to run any qt program that uses QMediaPlayer, I get the error message :

  defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

  Which means I don’t have a backend to play the video, right ? Is there any one that I can use which will with Qt, like ffmpeg ? And how can I get it to work ? Specially for h264 videos.

  I’ve tried to install gstreamer as is told on this link, but it’s not working. Will I have to rebuild the entire qt5 again ?

  P.S. : I have the raspberry pi 1 model B with raspbian installed.

  Edit : As mentioned by Greenflow, I checked the ./configure log and saw that the GStreamer was compiled in, but the video apps are still not working...

  The message on the log was like this :

  GStreamer .............. yes (0.10)

  And the message on Greenflow’s log was like this :

  GStreamer .............. yes (1.0)

  Clearly it’s another version of GStreamer, but is it the problem ?

  I’ve also found this post which says QtMultimedia on the Pi is rather useless, but the post is from 2013, so I’m not sure if it’s really relevant. I’d like to have this app playing hardware accelerated videos on my Raspberry Pi, but I’m almost dropping the idea.

  Anyways, thanks Greenflow for the head start.

  Edit 2 : Found this thread on the Qtcentre. Damn, this thing is not going to be easy to solve, I guess...

• HLS : How to detect out of order segments in media playlist ?

  27 juin 2018, par anirudh612

  What would be an efficient way to detect if an http live streaming VOD playlist has segments out of order (and count how many segments are out of order) ? They are ordered correctly based on the #EXT-X-PROGRAM-DATETIME tag but the segment decoding timestamps in some cases are out of order. Currently, the workflow I’m following is :

  1. Convert the HLS stream into an mp4 using ffmpeg :

     ffmpeg -i http://localhost:8080/test/unsorted.m3u8 -c copy -bsf:a aac_adtstoasc test/unsorted.mp4 &> test/unsorted_ffmpeg.log

  2. Inspect the logs and count number of occurrences of "Non-monotonous DTS in output stream" log messages :

     [mp4 @ 0x7fe74f01b000] Non-monotonous DTS in output stream 0:1 ; previous : 12063760, current : 11866128 ; changing to 12063761. This may result in incorrect timestamps in the output file.

     However, this requires downloading and reading all of the ts segments and is an expensive operation. Is there a more efficient way to determine out of order DTS or PTS in chunks using ffmpeg or ffprobe ?

• Live stream the screen and microphone to azure media services with ffmpeg

  16 octobre 2020, par Panzer Ihnen

  I'm able to stream a video of my screen to Azure Media Services with ffmpeg, but when I add the audio input, the stream stops with this error :

  


  ffmpeg: frame=   27 fps=0.0 q=0.0 size=       0kB time=00:00:00.36 bitrate=   8.4kbits/s dup=0 drop=7 speed=0.703x
ffmpeg: frame=   43 fps= 42 q=0.0 size=       0kB time=00:00:00.36 bitrate=   8.4kbits/s dup=0 drop=7 speed=0.356x    
ffmpeg: frame=   58 fps= 38 q=27.0 size=      37kB time=00:00:00.36 bitrate= 818.6kbits/s dup=0 drop=7 speed=0.24x    
ffmpeg: av_interleaved_write_frame(): End of file
ffmpeg:     Last message repeated 1 times
ffmpeg: [flv @ 0633fec0] Failed to update header with correct duration.
ffmpeg: [flv @ 0633fec0] Failed to update header with correct filesize.
ffmpeg: Error writing trailer of rtmp://rtmpurl/stream: End of file
ffmpeg: frame=   59 fps= 32 q=26.0 Lsize=      37kB time=00:00:00.39 bitrate= 764.5kbits/s dup=0 drop=7 speed=0.214x    
ffmpeg: video:35kB audio:2kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
ffmpeg: [libx264 @ 0633c6c0] frame I:1     Avg QP:18.27  size: 30491
ffmpeg: [libx264 @ 0633c6c0] frame P:16    Avg QP:20.68  size:  4210
ffmpeg: [libx264 @ 0633c6c0] frame B:42    Avg QP:23.25  size:   152
ffmpeg: [libx264 @ 0633c6c0] consecutive B-frames:  5.1%  0.0%  0.0% 94.9%
ffmpeg: [libx264 @ 0633c6c0] mb I  I16..4: 12.7% 36.9% 50.4%
Ffmpeg Exited
ffmpeg: [libx264 @ 0633c6c0] mb P  I16..4:  0.4%  1.0%  0.6%  P16..4: 45.6% 10.5% 12.1%  0.0%  0.0%    skip:29.8%
ffmpeg: [libx264 @ 0633c6c0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 15.5%  0.3%  0.0%  direct: 0.3%  skip:83.9%  L0:46.5% L1:51.0% BI: 2.5%
ffmpeg: [libx264 @ 0633c6c0] 8x8 transform intra:41.1% inter:59.1%
ffmpeg: [libx264 @ 0633c6c0] coded y,uvDC,uvAC intra: 79.9% 96.5% 88.6% inter: 7.8% 15.8% 5.4%
ffmpeg: [libx264 @ 0633c6c0] i16 v,h,dc,p: 20% 13%  6% 61%
ffmpeg: [libx264 @ 0633c6c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 21% 22%  4%  4%  5%  3%  3%  8%
ffmpeg: [libx264 @ 0633c6c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 16% 10%  5%  7%  7%  5%  6%  6%
ffmpeg: [libx264 @ 0633c6c0] i8c dc,h,v,p: 54% 18% 23%  5%
ffmpeg: [libx264 @ 0633c6c0] Weighted P-Frames: Y:0.0% UV:0.0%
ffmpeg: [libx264 @ 0633c6c0] ref P L0: 55.1%  2.9% 29.5% 12.6%
ffmpeg: [libx264 @ 0633c6c0] ref B L0: 79.5% 14.0%  6.6%
ffmpeg: [libx264 @ 0633c6c0] ref B L1: 93.2%  6.8%
ffmpeg: [libx264 @ 0633c6c0] kb/s:333.49
ffmpeg: Conversion failed!


  


  My ffmpeg command is :

  


  -f dshow -i audio="Microphone device" -strict -2 -c:a aac -f gdigrab -framerate 30 -offset_x 161 -offset_y 203 -video_size 430x322 -show_region 1 -i title="Window Title" -b:v 415K -g 60 -keyint_min 60 -b:a 32K -ar 22050 -filter:a "volume=0.8" -pix_fmt yuv420p -c:v libx264 -preset medium -bufsize 400k -maxrate 400k -f flv rtmp://rtmpurl/stream