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audio_level.png (14,175 bytes) |
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Hi Mr. YK Jung, We don't have SKB test file for volume measurement. There is a standard 1KHz tone with 0 dB wave file for this. Attached is the last result for volume adjust. It is applied to Smart3 and UHD4 already. There is only a little difference at level 1 & 2. Please provide SKB test stream in advanced because I don't know what is the different from our test file. Thanks! |
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Hi Kerwin Could you send me the file ( standard 1KHz tone with 0 dB wave file ) you tested? SKB is trying to check again with the same test. Thank you YK.jung |
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Hi Mr. YK Jung, wav file is attached. Reference_Level_0dB_48k.16_1.wav (2,880,092 bytes) |
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Hi Kerwin As a result of re-measuring from skb, volume level is currently OK. But when skb measured AAC and AC3, AC3 volume level is being output lower than AAC. Can you check this part again ( AC3 and AAC ) ? And can you explain why this is happening? Thank you YK.Jung |
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Hi Kerwin I attached three files ( 1kHz-0dBFS_ac3.ts / 1kHz-0dBFS_aac.ts / 1kHz-0dBFS_aac.mp4 ) Please check it Thanks 1kHz-0dBFS_aac.mp4 (88,008 bytes) |
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Hi Mr. YK Jung, I am not sure the reason why AC3 have lower level than AAC. As I know, there are some parameters like DRC (Dynamic Range Compression) in Dolby Spec. With different mode (LINE/RF), the output level will be little different. Thanks ! |
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Hi Kerwin Please measure the audio level with the 3 files I attached before. 1kHz-0dBFS_ac3.ts 1kHz-0dBFS_aac.mp4 1kHz-0dBFS_aac.ts Skb manager wants to receive measured results. Thanks! |
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Hi Mr. YK Jung, I checked with QA team and our audio Lab. is occupied till next Wednesday. So the test result will get by next Thursday(4/22). Thanks ! |
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Hi Kerwin I got it, Thanks!! |
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Hi Mr. YK Jung, The volume measurement is done. We don't see difference between AAC and AC3. Please check attached file for more details. Thanks ! Note: Our QA use mxplayer to play test files. It looks like VLC will use its own AC3 decoder. So we don't use VLC this time. |
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Hi Kerwin To verify consistent criteria for volume deviation in SKB. Please measure the audio level of the 6 files attached here . http://altserver01.iptime.org/share/2021-05-19_audio_level/ CM5000_자체AAC_Tone.ts CM5000_자체AC3_Tone.ts IP ALC_TS OUT_AAC_10min.ts IP ALC_TS OUT_AC3_10mim.ts SBS_정파.mpg SBS_CM5000_AAC.ts The attached files are AAC/AC3 files created by the broadcaster and AAC/AC3 files created by SKB. These files will be the standard. Please measure the audio level with these files. Thank you. YK.Jung |
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Hi Mr. YK. Jung, Please create another issue for AI2Max in SWAN project. Since the default output of AI2Max is speaker not HDMI as Smart3/UHD4, the measurement is different. Thanks ! |
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Hi Mr. YK. Jung, For Smart3/UHD4, we reserve our QA Audio Lab. on 5/27. So test results will be available on 5/28. Thanks ! |
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Hi Mr. YK. Jung, Please check attached file for volume level of different streams. Thanks ! |
- yk.jung ( (ALTech) Younkwang Jung ) developer
