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• How to utilize hardware decode for audio ?

  20 mars 2014, par jAckOdE

  I have a buffer that contain packets read by ffmpeg from a video file encoded using H264/AAC
  According to Apple document, audio stream encoded in AAC can be decode with hardware support,

  how to decode the audio stream with hardware support ?

  UPDATE : I use Audio Queue Service to output the audio. Right now i decode AAC packet using ffmpeg and send LPCM audio to AQS. According to the Apple document, I can send directly AAC audio to AQ and it will take care of decoding task. Does it decode with hardware ? Do i need, and how to set Audio Queue's parameter to enable audio hardware decoding ?

• FFMPEG hls m3u8 live stream

  4 juillet 2018, par Num Nuts

  I’m trying to download a m3u8 live stream but it requires cookies to access the files. Can anyone correct my command line ? Thanks.

  ffmpeg -headers "Cookie: reqPayload=^\^"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^\^";" -user-agent 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36' -loglevel verbose -i http://fox-foxcollegesports-central.live.sonytv.adaptive.level3.net/PROD02/sony/FOX_FCS_CENTRAL/live/2017/05/25/7418092/4500K/4500_slide.m3u8 -acodec copy -vcodec copy  output.mp4 -stimeout 3000 -y

  When I run the command it’s response is

  Trailing options were found on the commandline.

  Hyper fast Audio and Video encoder
  usage : ffmpeg [options] [[infile options] -i infile]... [outfile options] outfile...

  Use -h to get full help or, even better, run ’man ffmpeg’

  If I take out the cookies header, it says

  Unable to open key file https://key-service.totsuko.tv/key-service/key/key?contentId=15125048&channelId=24995&kid=29715503

  [hls,applehttp @ 0000000000778860] Error when loading first segment ’http://fox-foxcollegesports-central.live.sonytv.adaptive.level3.net/PROD02/sony/FOX_FCS_CENTRAL/live/2017/05/25/7418092/4500K/151/22/16/21_839.ts’
  http://fox-foxcollegesports-central.live.sonytv.adaptive.level3.net/PROD02/sony/FOX_FCS_CENTRAL/live/2017/05/25/7418092/4500K/4500_slide.m3u8 : Invalid data found when processing input

  Thanks in advance for whoever helps me get this working !

• FFMPEG : sws_scale returns error : Slice parameters 0, 2160 are invalid

  21 janvier 2020, par Matthew Czarnek

  I’m trying to follow a tutorial to display ffmpeg AVFrame output in SDL. The tutorial(and all examples I’m seeing online) are still using ’sws_getContext’, which has been deprecated and removed from the newest version of ffmpeg. Trying to change current pixel format from whatever it currently is to PIX_FMT_YUV420P, so I can display it. I believe I need the sws_scale function to accomplish this.

  However, sws_scale is the function that causes a command line error of :
  Slice parameters 0, 2160 are invalid

  Here is all my code associate with swsContext :

  struct SwsContext* av_sws_ctx = NULL;
  
  av_sws_ctx = sws_alloc_context();
  
  
  
  sws_init_context(av_sws_ctx, NULL, NULL);
  
  
  
  sws_scale(av_sws_ctx, (uint8_t const* const*)av_frame->data,
  
                          av_frame->linesize, 0, av_codec_context->height,
  
                          av_frame->data, av_frame->linesize);

  Further complicating the matter, SwsContext is only defined internal to ffmpeg, externally I can’t set/get any variables or even view them in the debugger.

  int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[] )

  The vales of other parameters, other than av_sws_ctx :

  srcSlice: av_frame->data = 
  
       8 arrays, first is filled with "\x10\x10\x10\x10\x10..."
  
       second and third are "€€€€€€€€€€€€€€€€€..."
  
       rest are NULL
  
  linesize(av_frame->linesize) is an array:
  
      3840,1920,1920,0,0,0,0,0
  
  srcSliceY:0
  
  srcSliceH:2160
  
  dest: same as second parameter (av_frame->data)
  
  dstStride: av_frame->linesize again

  If I drill into sws_scale source code, I find that this error is thrown by this chunk of code :

  if ((srcSliceY & (macro_height-1)) ||
  
          ((srcSliceH& (macro_height-1)) && srcSliceY + srcSliceH != c->srcH) ||
  
          srcSliceY + srcSliceH > c->srcH) {
  
          av_log(c, AV_LOG_ERROR, "Slice parameters %d, %d are invalid\n", srcSliceY, srcSliceH);
  
          return AVERROR(EINVAL);
  
      }

  I assume that the issue therefore is that the height of my video is bigger than sws_context(4k video). But can’t figure out how to tell sws_context what it’s height should be using sws_alloc_context or sws_init_context or any other function.

  See something I’m missing ? Thank you.