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Linux Based Receivers
Linux Receivers General
Glitches in overlapped recordings on the same channel
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<blockquote data-quote="intracube" data-source="post: 1053489" data-attributes="member: 380516"><p>A Samsung USB SSD.</p><p></p><p>It doesn't seem to be CPU or I/O related, since stress-testing by doing two simultaneous downloads while recording a live channel doesn't cause any glitches in the live recording.</p><p></p><p>During the above test:</p><p>enigma2 process maxes out at 100% CPU on one of the two cores</p><p>each download is around 4.7MB/sec (37Mbps), so nearly 80Mbps combined</p><p>in addition, another ~8Mbps for the live recording</p><p></p><p>So if the USB and SSD can cope with all that but still fails on a radio recording, it looks like a software issue. Another factor that pushes it in this direction is the glitch happens in a completely predictable way. If it was random glitches, then it could point to CPU or data throughput bottlenecks.</p><p></p><p>Or it could be some oddity with the hardware tuner/demuxer side of things. But if anything, recording from a single channel, eg BBC One, should be less demanding on the hardware than two different channels on the same multiplex - since the latter will have to demux twice the number of elementary streams (video, audio, subtitle, teletext, etc).</p><p></p><p></p><p>Yep, same issue. Sometimes it's a loud squeek, sometimes an almost silent glitch - it just depends which bits are being corrupted or missing. But Ffmpeg always reports a discontinuity in the stream.</p></blockquote><p></p>
[QUOTE="intracube, post: 1053489, member: 380516"] A Samsung USB SSD. It doesn't seem to be CPU or I/O related, since stress-testing by doing two simultaneous downloads while recording a live channel doesn't cause any glitches in the live recording. During the above test: enigma2 process maxes out at 100% CPU on one of the two cores each download is around 4.7MB/sec (37Mbps), so nearly 80Mbps combined in addition, another ~8Mbps for the live recording So if the USB and SSD can cope with all that but still fails on a radio recording, it looks like a software issue. Another factor that pushes it in this direction is the glitch happens in a completely predictable way. If it was random glitches, then it could point to CPU or data throughput bottlenecks. Or it could be some oddity with the hardware tuner/demuxer side of things. But if anything, recording from a single channel, eg BBC One, should be less demanding on the hardware than two different channels on the same multiplex - since the latter will have to demux twice the number of elementary streams (video, audio, subtitle, teletext, etc). Yep, same issue. Sometimes it's a loud squeek, sometimes an almost silent glitch - it just depends which bits are being corrupted or missing. But Ffmpeg always reports a discontinuity in the stream. [/QUOTE]
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Linux Based Receivers
Linux Receivers General
Glitches in overlapped recordings on the same channel
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