The patch is my hack. I also face the same issue as yours, so I patched FFmpeg to fix this bug
On Mon, Aug 8, 2011 at 3:09 PM, Josh Gargus <[email protected]> wrote: > Unfortunately I'm on Windows, and setting up a build environment for both > libav and it's prerequisite libraries is a bit of a hassle. > > Do you consider this patch to be The Right Thing? A hacky workaround? The > reason I ask is that if I can just wait a few days or weeks for it to show up > in a nightly build, then I'll wait. But, if there's no chance of having the > patch accepted as-is, then I'll have to think about other options. > > Cheers, > Josh > > > > On Aug 7, 2011, at 3:41 AM, avcoder wrote: > >> It's the bug of aacenc encoder in FFmpeg, try the following patch >> >> --- aacenc.c Thu Jan 15 17:14:12 1970 >> +++ aacenc.c Thu Jan 15 17:14:12 1970 >> @@ -573,6 +573,8 @@ >> } >> start_ch += chans; >> } >> + >> + s->last_frame_bits = 0; >> do { >> int frame_bits; >> init_put_bits(&s->pb, frame, buf_size*8); >> @@ -639,6 +641,10 @@ >> s->psy.bitres.bits = frame_bits / avctx->channels; >> break; >> } >> + //it seems that lambda is broken >> + if (s->last_frame_bits == frame_bits) >> + break; >> + s->last_frame_bits = frame_bits; >> >> s->lambda *= avctx->bit_rate * 1024.0f / avctx->sample_rate / >> frame_bits; >> >> --- aacenc.h Thu Jan 15 17:14:12 1970 >> +++ aacenc.h Thu Jan 15 17:14:12 1970 >> @@ -72,6 +72,7 @@ >> float lambda; >> DECLARE_ALIGNED(16, int, qcoefs)[96]; ///< quantized coefficients >> DECLARE_ALIGNED(32, float, scoefs)[1024]; ///< scaled coefficients >> + int last_frame_bits; >> } AACEncContext; >> >> #endif /* AVCODEC_AACENC_H */ >> >> >> On Sat, Aug 6, 2011 at 1:26 PM, Josh Gargus <[email protected]> wrote: >>> I'm running into a problem that seems essentially the same as: >>> http://stackoverflow.com/questions/2410459/encode-audio-to-aac-with-libavcodec >>> … except that I'm already encoding at a far lower bitrate than the threshold >>> that started to cause him problems (I encode at 64000bits/sec, and he was OK >>> below 386000bits/sec). >>> Has anyone else seen anything else like this? I'll be happy to provide more >>> details if anyone is interested. >>> Thanks, >>> Josh >>> _______________________________________________ >>> Libav-user mailing list >>> [email protected] >>> http://ffmpeg.org/mailman/listinfo/libav-user >>> >>> >> >> >> >> -- >> ----------------------------------------------------------------------------------------- >> My key fingerprint: d1:03:f5:32:26:ff:d7:3c:e4:42:e3:51:ec:92:78:b2 >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > -- ----------------------------------------------------------------------------------------- My key fingerprint: d1:03:f5:32:26:ff:d7:3c:e4:42:e3:51:ec:92:78:b2 _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
