#ffmpeg-devel on 2024-05-16 — irc logs at libera.irclog.whitequark.org

2024-04-05 00:04 michaelni changed the topic of #ffmpeg-devel to: Welcome to the FFmpeg development channel | Questions about using FFmpeg or developing with libav* libs should be asked in #ffmpeg | This channel is publicly logged | FFmpeg 7.0 has been released! | Please read ffmpeg.org/developer.html#Code-of-conduct

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10:09 <Lynne> sent off the first revision of the USAC decoder to the ML

10:10 <Lynne> its good enough in terms of integration, quality and you can still play around with it

10:11 <Lynne> you'll need to modify exhale by adding "#define NO_PREROLL_DATA 1" at the top of src/lib/exhaleLibPch.h to generate streams

10:12 <Lynne> also missing: keyframe parsing in mov/mp4

10:13 <Lynne> the keyframes USAC has are very "if you miss a frame, you'll get total garbage out" keyframes, not the lenient kind opus streams are

10:24 <JEEB> mp4 is supposed to have in the sample descriptions whether it's a random access point or not, so one would hope you wouldn't have to parse anything additional

10:24 <JEEB> or not sample description since that might be something different in the spec :P whatever the heck was the list of packets

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12:53 <Lynne> the issue is everything assumes that all audio only has keyframes, and a good program just added an exeption for truehd

13:03 <JEEB> but if the packet info is parsed from container stuff and properly exposed in the AVPacket API then at least seek APIs should properly handle it

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13:16 <mkver> jamrial: How could you commit this garbage: https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/vvc.c#L769-L777

13:16 <mkver> Oh wait, he is not here right now.

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13:30 <jdek> maybe you could tone it down a little now that he is here too

13:30 <mkver> jamrial: How could you commit this: https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/vvc.c#L769-L777

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13:32 <jamrial> mkver: it slipped through

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14:09 <cone-799> ffmpeg sunyuechi master:d4083ecb7c87: lavc/vc1dsp: R-V V mspel_pixels

14:58 <jamrial> mkver: patch sent

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15:57 <j-b> 17 files changed, 2850 insertions(+), 234 deletions(-)

15:57 <j-b> gg @Lynne

15:57 <Sean_McG> o_O;

16:04 <thardin> ff_ctz*_c() both have UB. the 32-bit version is easy to fix, the 64-bit version less so

16:08 <thardin> v == INT64_MIN ? INT64_MIN : (v & -v) surely there's a better way

16:09 <thardin> oh wait, casting to uint64_t should work. I think.

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16:13 <thardin> there we go. very pleasing

16:32 <Lynne> j-b: +250 more lines for complex stereo prediction

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21:46 <BtbN> Weren't there patches for enhanced rtmp multi-stream on the ML already?

21:46 <BtbN> I swear I saw those come by, but Thunderbird can't find them

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22:16 <BtbN> found them

22:16 <BtbN> had to search flv, not rtmp...

22:45 <BtbN> The flvenc.c code confuses me. Does it actually support any audio codec other than aac? Like, flv_write_codec_header looks like it would write nothing for any audio codec except aac

22:47 <Lynne> pretty sure mp3 is supported

22:49 <nevcairiel> only AAC specifies a custom data format, which includes the AudioSpecificConfig element, all other codecs just plainly put in the audio bitstream and use generic flv fields otherwise

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22:52 <BtbN> Hm, this will be messy with the enhanced rtmp stuff

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23:20 <cosminaught> > the issue is everything assumes that all audio only has keyframes

23:20 <cosminaught> This assumption no longer holds with xHE-AAC, and we ended up having to patch a bunch of places that were assuming all audio frames are keyframes to add an "unless xHE-AAC". I can send a patch if it helps.

23:22 <nevcairiel> TrueHD already had non-key audio frames, and you had to find a major sync frame if you resumed decoding

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