Re: [Discuss-gnuradio] Video Streaming
Hi Syed, from my perspective, the only way packets could get lost in your scenario 2 is when your operating system's network stack decides to drop packets, which should only happen if there is a big backlog of unread ones. Try replacing the UDP sink by a file sink and see if that content is complete. Anyway, you mention quality is somehow not good; I'm not quite sure what to make out of this. Usually, when you lose packets in an MPEG stream you lose frames or get visual garbage in some quadratic areas of the picture; is that the case? If you use ncat to save the received stream instead of mplayer to play it, how much smaller is the received file? Greetings, Marcus On 02/22/2014 10:52 AM, Syed Aqeel Raza wrote: Hi Marcus, Thanks for your reply. I’ve already implemented all the test scenario’s mentioned in my earlier email. All are working and produced a streaming video at the destination end. However, the problem is with the video quality. Yes, you’re right the selected video has a bitrate less than 1Mb/s and for the case of test 2 it’s transparent too; but the streaming quality is somehow not good as in test 1 and it further degrade when moving to test 3 and test 4, respectively. Furthermore, I’ve not used any throttle block in any of the flowgraph yet. At the current moment, I am investigating the options to calculate the packet dropping rate within the flowgraphs. Regards, Syed Aqeel Raza ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Video Streaming
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Syed, test 2 should be completely transparent and thus you shouldn't lose quality. The input bitrate of the video is below 1Mb/s, so for a pure loopback test I can't imagine this going wrong. Are you sure that the sending VLC does *not* decode the video into something with a much higher bitrate. Also make sure you don't use throttle in between. Greetings, Marcus On 20.02.2014 11:32, Syed Aqeel Raza wrote: Hi I am trying to stream a video over a wireless network using UDP protocol. For that, I started tests in the following sequence: Test 1: VLC VLC Test 2: VLC Gnuradio (using udp source and udp sink blocks only) VLC Test 3: VLC Gnuradio (with a complete communication model (e.g. mod/demod)) VLC Test 4: VLC Gnuradio USRPs (multiple) VLC Test 1 completed successfully and the streamed video quality is perfect at the receiver end. Whereas, in test 2, test 3 and test 4 I've successfully got the streamed video at the receiver end but the quality is not good (it's even more degraded when shift to the higher test levels). During the testing a warning message appeared on gnuradio console i.e. Too much data; packet loss. I tried to resolve this issue by adjusting the factors like payload size and sampling rate but nothing works. The flowcharts and the video are attached here for reference. Furthermore, can anyone give me a hint that how can I check the parameters like throughput, packet delay and SNR. Kindly assist me and point out the mistake I've made, waiting for earliest reply. Thanks. Regards, Syed Aqeel Raza ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -BEGIN PGP SIGNATURE- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTBxjSAAoJEAFxB7BbsDrLzxcH/ip3m6F2ls0itx95IlN2qov0 f3etC7XX0XgF91uO9XwpLSdjsIjGaXz8G7Yc7zKCkrcBL9xVuYl/xpqHKwxy2gWL /FoROdlioZ7Nr/xWkuMTsRAJQgx/VIVWLSoSutdT4Bc7fc4z6lcosPDQ/ShUziw9 IZnfPfX2Wumh1QkOKkcIYxTjyIL1tqi6X2T3LrfHC3FBc2g3JL90xPFlc4hXfMHM 0zwkXNiSAVZxzRgbW5mHolygU80AvrP529B2mHD9hoiJfDTGLDvyxmsrU2E2Pc2Y GCnIJ5bHQBENcemYeGceKtRsd9MO7TV9RyTOR4q2ghhIn1z2W+WFMvY4JwRG800= =gDsk -END PGP SIGNATURE- ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Video Streaming
On 02/20/2014 11:32 AM, Syed Aqeel Raza wrote: Kindly assist me and point out the mistake I've made, waiting for earliest reply. Thanks. Syed, this not a reasonable thing to ask for here. You have built an entire transceiver chain, and all you tell is that it's not working. Unless someone is extremely bored, no-one will help you with a request like this. No, I assume you actually want help, and are not posting this question to annoy anyone. Here's some advice: - Read this: http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors - Narrow down the problem. Convince us that you've tried many things to get it right. Without even looking at your flow graph, I assume there's several things that aren't working, since so much can go wrong in digital comms. M ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Video Streaming Issue (most probably at receiving end)
Please ask these questions on the mailing list. On 02/03/2014 12:44 PM, Syed Aqeel Raza wrote: Hi Martin, Again, I did some more work and the details are as under. 1. I have created a single flowgraph without USRP hardware. For your reference the file is enclosed with the name of gmsk_file_transceiver.grc. This work fine and we can see the stream video output without any difficulty. This does *not* mean your flowgraphs are working. I haven't been able to check them, but there's many things that can go wrong over the air which won't in a simulation. 2. To continue further I splitted the above mentioned file into transmitter and receiver side along with the inclusion of USRP source and sink blocks, respectively. Their flowgraphs are enclosed with the name of gmsk_tx.grc and gmsk_rx.grc, respectively. The FFT plot shows that (vdo transmission.png enclosed) transmitter and receiver handshakes with each other but the signal difference between the transmitter and the receiver side is 80 dB. I further noticed that whenever I stopped the transmission the received signal at the receiver further drops to -120 dB. You are working with relative power levels here, so the dB values don't mean that much. Martin ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Video Streaming Issue (most probably at receiving end)
Hi Ron, Thanks for your suggestion. It works for me :) Regards, Syed Aqeel Raza On Mon, Feb 3, 2014 at 11:54 PM, Syed Aqeel Raza s.aqeelr...@gmail.comwrote: Hi, Again, I did some more work and the details are as under. 1. I have created a single flowgraph without USRP hardware. For your reference the file is enclosed with the name of gmsk_file_transceiver.grc. This work fine and we can see the stream video output without any difficulty. 2. To continue further I splitted the above mentioned file into transmitter and receiver side along with the inclusion of USRP source and sink blocks, respectively. Their flowgraphs are enclosed with the name of gmsk_tx.grc and gmsk_rx.grc, respectively. The FFT plot shows that (vdo transmission.png enclosed) transmitter and receiver handshakes with each other but the signal difference between the transmitter and the receiver side is 80 dB. I further noticed that whenever I stopped the transmission the received signal at the receiver further drops to -120 dB. I really get stuck in this issue for the last two days. I need your assistant to resolve this problem as I am a newbie in gnuradio using USRP platform. Thanks in advance. Regards, Syed Aqeel Raza On Sat, Feb 1, 2014 at 11:36 AM, Syed Aqeel Raza s.aqeelr...@gmail.comwrote: Hi Martin, Thanks for your reply. I have made some changes in the flowgraphs due to which the transmitter and receiver sides handshakes with each other. Despite of this handshaking, the receiver side is not produced the required baseband signal. Furthermore, I have designed a single flowgraph that comprises on transmitter and receiver without the inclusion of USRP source and sink block. That single flowgraph works fine and perfectly streaming the video. I will send the updated flowgraphs to you by tomorrow. Regards, Syed Aqeel Raza On Sat, Feb 1, 2014 at 8:05 PM, Martin Braun martin.br...@ettus.comwrote: On 30.01.2014 18:17, Syed Aqeel Raza wrote: I have checked the transmission part, which is working perfectly by transmitting a video stream over the wireless. Whereas, no video reception is displayed on receiver end. How did you test the transmitter? For further reference, I have attached the flow charts used for transmission and reception of video streaming. An earliest reply is highly appreciated. There's many things that can go wrong here. Does your rx spectrum look good? MB ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Video streaming through gr-extras tuntap in pre-cog
Hi I am trying to stream a VLC video stream to the gr-extras tuntap device. I have modified the simple_trx demo to include tuntap device and run the flow graph as a root. I assign the tap device the required ip address but I am not sure how to assign a port number to it. Then I configure the vlc media player to stream webcam video to the tap device address. I disable the ARQ in the pre-cog. The flow graph runs correctly but on a spectrum analyzer I just see a single packet and then everything turns off. Does any body know how to stream video in to the tuntap device. Regards ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Video streaming through gr-extras tuntap in pre-cog
Dear GNU Radio Guru, For the sake of this list, I'm going to have to ask you to send all support requests for pre-cog to john.malsb...@ettus.com. I'll be getting to the other three e-mails you sent last night in a little while. -John On Sat, Jul 20, 2013 at 9:05 AM, GNU radio gnuradio.g...@gmail.com wrote: Hi I am trying to stream a VLC video stream to the gr-extras tuntap device. I have modified the simple_trx demo to include tuntap device and run the flow graph as a root. I assign the tap device the required ip address but I am not sure how to assign a port number to it. Then I configure the vlc media player to stream webcam video to the tap device address. I disable the ARQ in the pre-cog. The flow graph runs correctly but on a spectrum analyzer I just see a single packet and then everything turns off. Does any body know how to stream video in to the tuntap device. Regards ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] video streaming with vlc over gnuradio
Hi all, I'm trying to stream video using tunnel.py. I run the script on two machines (Ubuntu 12.10), configured IP addresses then run ping. I got Tx and Rx traces displayed on both sides but the ping command displayed Destination host unreachable. Is there a problem with my experiment or it's related to pind and ICMP response? If so, I tried to configure vlc server and vlc client to stream video through gnuradio but I got always Error on the client side (can't open http://IPaddr:portnum). Any idea? Best Regards, Nada ABDELKADER This message was sent using IMP, the Internet Messaging Program. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] video streaming on ofdm
On Sat, Apr 14, 2012 at 10:46 AM, rara sya_tir...@ymail.com wrote: The OFDM you're using is just the PHY layer. There are lots of other parts to a working video streaming application (all the other layers of the stack). Any you probably don't even have FEC in the system. So yes, there are lots of other things you can do to make the stream play better. i'm sorry...i'm still new in this field...i cant see what u try to tell bout the FEC...n as i told before...someone have suggest me to implement buffer...but u said there are others option can be use...can u suggest n explain on it more...@ can u give me example so that i can get more clear view on it.. -- View this message in context: http://old.nabble.com/video-streaming-on-ofdm-tp33672798p33700212.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] video streaming on ofdm
here is command that i use... gst-launch -e v4l2src ! video/x-raw-yuv, framerate=10/1, width=320, height=240 ! ffmpegcolorspace ! ffenc_mpeg4 ! avimux ! filesink location=tx i manage to receive the webcam,but at certain time the video stop and suddenly play so fast showing on the previous playback...someone suggest me to add buffer for smooth video..but, i'm out of idea how to implement the buffer on my grc block...can u help me??regarding on the fps, i cant see what value are suitable to be used n why the value should be like that... sumitstop wrote: try reducing the fps. this worked for me rara wrote: hye... i'm using grc for video streaming of ofdm system... i manage to transmit the video but the quality is so bad and sometime the video can play,but sometime it doesn't play at all... how to improve the video quality?is it approriate to add buffer on it? and i got this message...what does it meant?? gst-launch -v playbin uri=file:///root/rx Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Stream contains no data. Additional debug info: gsttypefindelement.c(570): gst_type_find_element_handle_event (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Can't typefind empty stream ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... tq -- View this message in context: http://old.nabble.com/video-streaming-on-ofdm-tp33672798p33700029.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] video streaming on ofdm
actually I did this one .. I was having the problem of bad video quality so I reduced the fps and it was better. here is the link. I am not sure if it will be of accurate help ... (I guess u must have seen this already :-D) http://wiki.oz9aec.net/index.php/Simple_DVB_with_Gstreamer_and_GNU_Radio he is not using ofdm but still u can see the values which u want.. hope it will help rara wrote: here is command that i use... gst-launch -e v4l2src ! video/x-raw-yuv, framerate=10/1, width=320, height=240 ! ffmpegcolorspace ! ffenc_mpeg4 ! avimux ! filesink location=tx i manage to receive the webcam,but at certain time the video stop and suddenly play so fast showing on the previous playback...someone suggest me to add buffer for smooth video..but, i'm out of idea how to implement the buffer on my grc block...can u help me??regarding on the fps, i cant see what value are suitable to be used n why the value should be like that... sumitstop wrote: try reducing the fps. this worked for me rara wrote: hye... i'm using grc for video streaming of ofdm system... i manage to transmit the video but the quality is so bad and sometime the video can play,but sometime it doesn't play at all... how to improve the video quality?is it approriate to add buffer on it? and i got this message...what does it meant?? gst-launch -v playbin uri=file:///root/rx Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Stream contains no data. Additional debug info: gsttypefindelement.c(570): gst_type_find_element_handle_event (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Can't typefind empty stream ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... tq - Sumit Kr. Research Assistant Communication Research center IIIT Hyderabad India -- View this message in context: http://old.nabble.com/video-streaming-on-ofdm-tp33672798p33700876.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] video streaming on ofdm
On Sat, Apr 14, 2012 at 10:46 AM, rara sya_tir...@ymail.com wrote: hye... i'm using grc for video streaming of ofdm system... i manage to transmit the video but the quality is so bad and sometime the video can play,but sometime it doesn't play at all... how to improve the video quality?is it approriate to add buffer on it? and i got this message...what does it meant?? The OFDM you're using is just the PHY layer. There are lots of other parts to a working video streaming application (all the other layers of the stack). Any you probably don't even have FEC in the system. So yes, there are lots of other things you can do to make the stream play better. gst-launch -v playbin uri=file:///root/rx Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Stream contains no data. Additional debug info: gsttypefindelement.c(570): gst_type_find_element_handle_event (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Can't typefind empty stream ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... tq That's outside of GNU Radio and I have no experience with it. Sorry, can't help you with this one. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] video streaming on ofdm
try reducing the fps. this worked for me rara wrote: hye... i'm using grc for video streaming of ofdm system... i manage to transmit the video but the quality is so bad and sometime the video can play,but sometime it doesn't play at all... how to improve the video quality?is it approriate to add buffer on it? and i got this message...what does it meant?? gst-launch -v playbin uri=file:///root/rx Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Stream contains no data. Additional debug info: gsttypefindelement.c(570): gst_type_find_element_handle_event (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Can't typefind empty stream ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... tq - Sumit Kr. Research Assistant Communication Research center IIIT Hyderabad India -- View this message in context: http://old.nabble.com/video-streaming-on-ofdm-tp33672798p33688992.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] video streaming on ofdm
hye... i'm using grc for video streaming of ofdm system... i manage to transmit the video but the quality is so bad and sometime the video can play,but sometime it doesn't play at all... how to improve the video quality?is it approriate to add buffer on it? and i got this message...what does it meant?? gst-launch -v playbin uri=file:///root/rx Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Stream contains no data. Additional debug info: gsttypefindelement.c(570): gst_type_find_element_handle_event (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind: Can't typefind empty stream ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... tq -- View this message in context: http://old.nabble.com/video-streaming-on-ofdm-tp33672798p33672798.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
