Hi On Thu, Oct 25, 2018 at 08:36:26AM +0000, Stephenson, Angelica wrote: > Hello, > > I’m emailing to seek your advice. For the past few months, a team here at Sky > UK has performed testing to determine whether FFmpeg would be a suitable > transcode resource for a variety of use cases. Some tests failed due to > stream analysers reporting errors, summary listed below. What would be > required to make a sensible and indicative estimate on cost and level of > effort required for you or someone in your team to resolve the errors being > reported? > > Errors reported by analysers > > * Unable to insert PCR on PES (TR-8 requirement from Sky's VRP video spec > for PDL) > * MPEG and AAC audio buffer overflows (Manzanita) > * PES header data_alignment_indicator flag not set for video and audio > (Manzanita) > * Failed HRD conformance check (Tektronix Cerify) > * TB overflows (A/V Codec Analyser) > * PTS (Presentation Timestamp) interval is not constant in audio stream > (A/V Codec Analyser) > * PTS must occur after end of Access Unit (A/V Codec Analyser) > * PCR discontinuities (A/V Codec Analyser)
reproducable testcases would very usefull. Iam sure there are bugs in our mpeg ts muxer but possibly some of these are also just configuration issues. More generally and a maybe this is a little bit a rant ;) If all these slightly expensive Analysers would have been available to the wider community then the developers who worked on the related code would have been aware of the problems with details and would have been able to fix these when the code was originally written or at least long ago. As it is, its not unknown there are problems in the code but with no details and no easy way to test potential fixes, its not so easy to fix for many developers. There may be a very small number of developers who know mpeg-ts so well they can understand and fix bugs without any way to test but i think there are many more people who have a more shallow understaning and who have more time who could with detailed information of what is wrong and with the ability to test changes be able to fix these as well I hope my slightly random comment helps Iam not sure i have enough time to work on these myself but i would possibly be in principle be interrested to try/play with fixing some of these if there maybe was some sort of bounty on a working fix for each and i wouldnt have to commit myself to fixing it. mpeg-ts is not exactly my most favorite format and some of these might be non trivial or end up requiring large scale changes, i am also no mpeg-ts expert, i know the format only approximatly. Thats just my personal view, iam sure others have other views about mpeg-ts, our (buggy) implementation and how to best improve it. I do not know if theres someone who knows mpeg-ts well, has plenty of time and wants to fix all the issues. But if so, that would of course be best. Thanks > > Thanks in advance, > Angelica. > > Angelica Stephenson > Senior Technical Lead > > Sky UK > Tel: +44 (0) 7596 352 078 > Email:angelica.stephen...@sky.uk<mailto:angelica.stephen...@sky.uk> > Website:www.sky.com<blocked::blocked::http://www.sky.com/> > > [cid:image001.png@01D32B1F.A2CDE760] > Information in this email including any attachments may be privileged, > confidential and is intended exclusively for the addressee. The views > expressed may not be official policy, but the personal views of the > originator. If you have received it in error, please notify the sender by > return e-mail and delete it from your system. You should not reproduce, > distribute, store, retransmit, use or disclose its contents to anyone. Please > note we reserve the right to monitor all e-mail communication through our > internal and external networks. SKY and the SKY marks are trademarks of Sky > plc and Sky International AG and are used under licence. > > Sky UK Limited (Registration No. 2906991), Sky-In-Home Service Limited > (Registration No. 2067075), Sky Subscribers Services Limited (Registration > No. 2340150) and Sky CP Limited (Registration No. 9513259) are direct or > indirect subsidiaries of Sky plc (Registration No. 2247735). All of the > companies mentioned in this paragraph are incorporated in England and Wales > and share the same registered office at Grant Way, Isleworth, Middlesex TW7 > 5QD > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB The real ebay dictionary, page 2 "100% positive feedback" - "All either got their money back or didnt complain" "Best seller ever, very honest" - "Seller refunded buyer after failed scam"
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