Right. I was using the same ports for both incoming streams. Thanks. On Wed, Mar 10, 2010 at 2:47 PM, Luca Abeni <[email protected]> wrote:
> On 10/03/10 19:01, Ke Yu wrote: > >> Hi All, >> >> I'm trying to open two udp multicast streams simultaneously in one >> process. >> The first call to av_open_input_file has been working fine. However, the >> second call to av_open_input_file always failed with return value -5 I/O >> error. Is this by design or just a bug? Is there anyway to work around >> this >> issue? >> >> There's once more piece of information: if I start more than one FFMpeg >> instances on the same machine to open different udp multicast streams, the >> second one failed with IO error. >> > > Which version of ffmpeg are you using? > It does not happen here: > [l...@dhcp047 ffmpeg]$ ./ffmpeg -i udp://224.20.30.40:6000 > FFmpeg version SVN-r22435, Copyright (c) 2000-2010 the FFmpeg developers > built on Mar 10 2010 20:37:30 with gcc 4.4.3 20100127 (Red Hat 4.4.3-4) > configuration: > libavutil 50.11. 0 / 50.11. 0 > libavcodec 52.58. 0 / 52.58. 0 > libavformat 52.55. 0 / 52.55. 0 > libavdevice 52. 2. 0 / 52. 2. 0 > libswscale 0.10. 0 / 0.10. 0 > (ffmpeg waits for the stream) > [l...@dhcp047 ffmpeg]$ ./ffmpeg -i udp://224.20.30.40:5000 > FFmpeg version SVN-r22435, Copyright (c) 2000-2010 the FFmpeg developers > built on Mar 10 2010 20:37:30 with gcc 4.4.3 20100127 (Red Hat 4.4.3-4) > configuration: > libavutil 50.11. 0 / 50.11. 0 > libavcodec 52.58. 0 / 52.58. 0 > libavformat 52.55. 0 / 52.55. 0 > libavdevice 52. 2. 0 / 52. 2. 0 > libswscale 0.10. 0 / 0.10. 0 > (waits for the stream, without failing). > > Of course, if I start the second one as "./ffmpeg -i udp:// > 224.20.30.40:6000" it fails, because two different processes cannot > receive packets from the same port. > > > Luca > > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
