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27th February 2021, 15:07 | #1 | Link |
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Quiet audio from staxrip
I used to use handbrake to encode my videos, the audio would be encoded into ac3. Now im using staxrip, and im using opus audio. Watching on my tv, the audio is very quiet, i have to turn it up at least twice as far as i used to (15-20 up to 40-50). Whats going on here? It could be the show, ill have a look as i also have the handbrake encode.
EDIT: I muxed the ac3 audio from handbrake into the file from staxrip, along with the opus audio. I watched the video on my tv, and switched between the 2, ac3 from handbrake is clearly louder. EDIT 2: Playing the 2 files on my PC, I dont notice a difference in volume, only on my tv. Last edited by YaBoyShredderson; 27th February 2021 at 17:01. Reason: Additional information |
27th February 2021, 18:11 | #2 | Link |
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That's codec specific and not StaxRips fault. You can add gain if you'd like. You can also encode with staxrip in ac3 if you'd like.
Feel free to check out my software in my signature too. Sent from my SM-G986U1 using Tapatalk |
27th February 2021, 21:06 | #4 | Link | |
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Opus is higher quality then AC3, you can use the gain option to raise the sound some during encode or you can continue using AC3. If its stereo QAAC is really nice too. StaxRip and my program supports all these options. Sent from my SM-G986U1 using Tapatalk |
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27th February 2021, 21:25 | #5 | Link | |
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28th February 2021, 00:02 | #6 | Link | |
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Quote:
Maybe is a problem of decoders is some devices, for you in the DTS, for YaBoyShredderson in the TV opus decoder.
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28th February 2021, 00:26 | #7 | Link | |
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Sent from my SM-G986U1 using Tapatalk |
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1st March 2021, 14:00 | #9 | Link |
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In order to amplify the volume without damage your audio you can use the volumedetect filter before.
Also to confirm the TV opus decode problem you can make some test over an audio ac3 converted to opus: First check the volume: Code:
ffmpeg -i test.ac3 -af "volumedetect" -acodec pcm_s24le test_ac3.wav ... [Parsed_volumedetect_0 @ 000001c441599fc0] mean_volume: -26.4 dB [Parsed_volumedetect_0 @ 000001c441599fc0] max_volume: -1.1 dB ... Code:
ffmpeg -i test.ac3 -acodec libopus -ab 128k test.opus ffmpeg -i test.opus -af "volumedetect" -acodec pcm_s24le test_opus.wav" ... [Parsed_volumedetect_0 @ 0000024505fdee80] mean_volume: -26.5 dB [Parsed_volumedetect_0 @ 0000024505fdee80] max_volume: -1.0 dB ... This sample only admit amplify 1dB without distort. If max_volume was -6 dB you can recode the opus with: Code:
ffmpeg -i test.ac3 -af "volume=6dB" -acodec libopus -ab 128k test.opus
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1st March 2021, 14:37 | #10 | Link |
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Maybe it's something to do with volume metadata. I know very little about opus, but I know the gain is supposed to be saved to the opus header, and maybe your TV has expectations regarding gain metadata, and maybe it reduces the volume when there aint none. Something like the way Dialnorm works for AC3.
Until an opus expert comes along (edit: tebasuna51 posted before I submitted mine, so there's an expert here now), have a look to see if there's any gain info saved (I checked with MediaInfo in debug mode). 00009 Frame (19 bytes) 000009 Identification (19 bytes) 000009 opus_codec_id: OpusHead 000011 opus_version_id: 1 (0x01) 000012 channel_count: 2 (0x02) 000013 preskip: 312 (0x0138) 000015 rate: 44100 (0x0000AC44) 000019 ouput_gain: 0 (0x0000) 00001B channel_map: 0 (0x00) It's possible without a gain value, players are supposed to make an assumption, and the volume is reduced as a result of that assumption. Or maybe that's complete bollocks. I don't know. Last edited by hello_hello; 1st March 2021 at 15:09. |
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ac3, audio, handbrake, opus, staxrip |
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