Hello, can anyone help on this? I still have not solved syncing problems on SDI output when I use live inputs (udp://)
Input (permanent broadcasting channel) is tested and DVB compliant. Audio / video are perfectly synced on professional decoders sdi output. I am using last version of Melt (6.12.0 and 6.13.0) and very simple commands: *#!/bin/bash* *export LD_LIBRARY_PATH=/usr/local/lib/* */usr/bin/melt -profile atsc_1080p50 udp://224.168.240.200:5200?fifo_size=9050000 <http://224.168.240.200:5200?fifo_size=9050000> audio_index=all -consumer decklink:0 channels=16* *exit 0* If I remove the audio_index=all, I get better results for a while. I mean, in the ouput I only get first audio pair but it does not go off-sync with the video so quick. If I include the audio_index=all option I loose syncing with the second audio pair (VO) usually in a matter of minutes. Sometimes is off-sync from the moment of starting. Any help would be really appreciated. Regards, David On Mon, 17 Sep 2018 at 18:08, David Alonso Grande <dalon...@gmail.com> wrote: > Hello, > > I am trying to setup an SDI Decoder with Melt and a Decklink Duo 2 card. > > I don't have any issues when I decode from files or if my UDP input has > only one audio pair. > > But I am using a live 4 audio channels Mpeg-2 UDP TS as input (see ffprobe > output below): > > Input #0, mpegts, from 'udp://224.168.240.71:2071': > Duration: N/A, start: 91131.278900, bitrate: 9480 kb/s > Program 703 > Metadata: > service_name : Viajar SD > service_provider: > Stream #0:0[0x1b77]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), > yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 9000 kb/s, 25 fps, 25 > tbr, 90k tbn, 50 tbc > Stream #0:1[0x1b78](spa): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 > Hz, stereo, fltp, 256 kb/s > Stream #0:2[0x1b79](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 > Hz, stereo, fltp, 224 kb/s > > > I am using this command: > > /usr/bin/melt -profile atsc_1080i_50 av.fps=30 udp:// > 224.168.240.71:2071?fifo_size=4525000 audio_index=all -filter > audiochannels -filter audiomap 0=0 1=1 2=2 3=3 4=4 5=5 6=6 7=7 8=8 > -consumer decklink:0 channels=8 > > And I don't manage to sync video and audio on SDI output. > > If I play UDP input with VLC everything is OK. > > If I do a first step recording input with this ffmpeg command: > > /home/decoder/melt/20180711/bin/ffmpeg -i 'udp:// > 224.168.240.71:2071?fifo_size=4525000&overrun_nonfatal=1' \ > -map 0:0 -map 0:1 -map 0:2 \ > -c:v mpeg2video -pix_fmt yuv420p -r 25 -s 1920x1080 -aspect 16:9 -qscale:v > 2 \ > -c:a mp2 -b:a 192k \ > -f mpegts /home/decoder/PRUEBAS_MELT_AUDIOS/viajar_SD.ts > > And then decode it with Melt from file: > > /usr/bin/melt -profile atsc_1080i_50 > /home/decoder/PRUEBAS_MELT_AUDIOS/viajar_SD.ts audio_index=all -filter > audiochannels -filter audiomap 0=0 1=1 2=2 3=3 4=4 5=5 6=6 7=7 8=8 > -consumer decklink:0 channels=8 > > everything is OK on SDI output. > > I would need to do it in one step, without recording. > > I can upload a sample of input recording if that helps. > > Any advice would be greatly appreciated. > > Regards, > > David > > > > > > > > > >
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