Thanks Shaun,
Well I am learning along the way as well as far as webcam formats are concerned.
One of the nice things about vMix is it tends to sort out frame rates, formats and
interlacing for you.
I need to correct the default configuration I released with the code as it has a higher input frame
frame than output frame rate which messes things up (mea culpa).
- Charles
DATV-Express Project - February update report
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Thank you
Re: DATV-Express Project - February update report
Last edited by G4GUO on Tue Mar 15, 2016 8:17 am, edited 1 time in total.
Re: DATV-Express Project - February update report
I have finally installed the v1.05 Express_DVB-S_Transmitter software for Windows on two machines in an effort to catch-up with Charles G4GUO’s software efforts. The new windows software ran smoothly on Win7 and Win10. On my notebook win7, not only did it install and run smoothly…but when I upgraded that notebook to Win10…it survived the Microsoft upgrade and was working as soon as I started Win10 without any changes or issues. Figure 1 below indicates that I was testing C615 and C920 webcams with and without a standalone headset microphone. All my testing so far has been for MPEG-2 (aka H.262).
Fig 1- Another typical set-up for Express_DVB-S_Transmitter software for Windows that I set up for Win7 and Win10
My testing used both the LogiTech C615 and C920 webcams for MPEG-2 (aka H.262).
One of the features that Charles has added is a simple “call letters IDENT” field that can be used to turn on your call letters being displayed during the transmission. See Figure 2 for a sample of MPEG-2 being received on an old DVB-S SetTopBox (STB). The SatLink DVB-S-only analyzer that I have captured the video and audio equally well.
Fig 2- a screen-capture of transmitted video with the call-letters IDENT feature, received using an old DVB-S-only STB.
I succeeded in sending MPEG-2 from the LogiTech C920 webcam without any of the long latency I had encountered with the C920 using earlier software with VMIX. You may remember that C920 outputs H.264 video as default…and my test set-up had to convert H.264-to-native-to-H.262, resulting in about 12 seconds of video latency (delay from camera). In fact, the C920 configuration latency was so short, I did not even bother to measure the latency. The Express_DVB-S_Transmitter software allowed me to sort through a large number of video capture formats. Figure 3 shows that for MPEG-2 testing, I choose a video capture format of “640 480 30 I420” and receive great video on both SatLink and STB.
Fig 3- Some video-capture format settings available using C920 camera with express_DVB-S_transmitter software
...de Ken W6HHC
Fig 1- Another typical set-up for Express_DVB-S_Transmitter software for Windows that I set up for Win7 and Win10
My testing used both the LogiTech C615 and C920 webcams for MPEG-2 (aka H.262).
One of the features that Charles has added is a simple “call letters IDENT” field that can be used to turn on your call letters being displayed during the transmission. See Figure 2 for a sample of MPEG-2 being received on an old DVB-S SetTopBox (STB). The SatLink DVB-S-only analyzer that I have captured the video and audio equally well.
Fig 2- a screen-capture of transmitted video with the call-letters IDENT feature, received using an old DVB-S-only STB.
I succeeded in sending MPEG-2 from the LogiTech C920 webcam without any of the long latency I had encountered with the C920 using earlier software with VMIX. You may remember that C920 outputs H.264 video as default…and my test set-up had to convert H.264-to-native-to-H.262, resulting in about 12 seconds of video latency (delay from camera). In fact, the C920 configuration latency was so short, I did not even bother to measure the latency. The Express_DVB-S_Transmitter software allowed me to sort through a large number of video capture formats. Figure 3 shows that for MPEG-2 testing, I choose a video capture format of “640 480 30 I420” and receive great video on both SatLink and STB.
Fig 3- Some video-capture format settings available using C920 camera with express_DVB-S_transmitter software
...de Ken W6HHC