[FFmpeg-trac] #356(avcodec:new): -profile aac_low option sets also the profile for the video codec

[FFmpeg]

#356: -profile aac_low option sets also the profile for the video codec
---------------------+-------------------------
 Reporter:  tfoucu   |        Type:  defect
   Status:  new      |    Priority:  normal
Component:  avcodec  |     Version:  git-master
 Keywords:           |  Blocked By:
 Blocking:           |  Reproduced:  0
 Analyzed:  0        |
---------------------+-------------------------
 ex:
 ./ffmpeg -i trailer_720p.20.flv -b 56000 -vf scale=176:144 -level 8
 -vcodec mpeg4 -ab 24000 -ar 22050 -ac 1 -profile aac_low -acodec libfaac
 -f mp4 -y /tmp/test.mp4

 will generate a mp4 file with the video codec profile/level to be 24

 output from mp4info:
 Track   Type    Info
 1       video   '''MPEG-4 Unknown Profile(24)''', 211.085 secs, 63 kbps,
 176x144 @ 23.976123 fps
 2       audio   MPEG-4 AAC LC, 211.162 secs, 24 kbps, 22050 Hz


 if you remove the profile option from the command line, output of mp4info
 Track   Type    Info
 1       video   MPEG-4 Simple @ L0, 211.085 secs, 63 kbps, 176x144 @
 23.976123 fps
 2       audio   MPEG-4 AAC LC, 211.162 secs, 24 kbps, 22050 Hz


 So, it seems that -profile aac_low does set the profile of the video
 encoder context to be 1 as well as the audio encoder context.


 The exact output of the command line with -profile aac_low
 ./ffmpeg -i trailer_720p.20.flv -b 56000 -vf scale=176:144 -level 8
 -vcodec mpeg4 -ab 24000 -ar 22050 -ac 1 -profile aac_low -acodec libfaac
 -f mp4 -y /tmp/test.mp4
 ffmpeg version N-31566-gd303e0a, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Jul 19 2011 20:35:45 with gcc 4.4.3
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-
 libfaac
   libavutil    51. 11. 0 / 51. 11. 0
   libavcodec   53.  8. 0 / 53.  8. 0
   libavformat  53.  6. 0 / 53.  6. 0
   libavdevice  53.  2. 0 / 53.  2. 0
   libavfilter   2. 27. 0 /  2. 27. 0
   libswscale    2.  0. 0 /  2.  0. 0
   libpostproc  51.  2. 0 / 51.  2. 0
 [flv @ 0x260d420] Estimating duration from bitrate, this may be inaccurate

 Seems stream 0 codec frame rate differs from container frame rate: 1000.00
 (1000/1) -> 23.98 (24000/1001)
 Input #0, flv, from 'trailer_720p.20.flv':
   Duration: 00:03:31.06, start: 0.000000, bitrate: 256 kb/s
     Stream #0.0: Video: flv, yuv420p, 1280x720, 23.98 tbr, 1k tbn, 1k tbc
     Stream #0.1: Audio: mp3, 44100 Hz, stereo, s16, 256 kb/s
 [buffer @ 0x260d360] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:0/1
 sws_param:
 [scale @ 0x2610d40] w:1280 h:720 fmt:yuv420p -> w:176 h:144 fmt:yuv420p
 flags:0x4
 Output #0, mp4, to '/tmp/test.mp4':
   Metadata:
     encoder         : Lavf53.6.0
     Stream #0.0: Video: mpeg4, yuv420p, 176x144, q=2-31, 56 kb/s, 24k tbn,
 23.98 tbc
     Stream #0.1: Audio: libfaac (LC), 22050 Hz, 1 channels, s16, 24 kb/s
 Stream mapping:
   Stream #0.0 -> #0.0
   Stream #0.1 -> #0.1
 Press [q] to stop, [?] for help
 frame= 5061 fps=141 q=2.0 Lsize=    2320kB time=00:03:31.08 bitrate=
 90.0kbits/s
 video:1623kB audio:619kB global headers:0kB muxing overhead 3.477867%

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/356>
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