Great news! Using the fdk_aac for audio worked perfectly to create a 320Kb/s CBR. I sent the Voukoder-processed file to QC and it passed perfectly.
This is a great plugin and will save us a lot of time!
Beiträge von gwaugh
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It's almost like Ffmpeg tries to optimize and makes a decision, based on the source audio, whether or not VBR will more efficient and override your settings. As in, it's concludes that anything more than a certain amount for that audio will make no difference so goes with the method that's the lower of the two. This could explain why we are all seeing different numbers since we're using different test files. Ours are a lot of spoken word.
Is there a way to use a different encoder (like Fraunhaufer) that will always do CBR? I saw in an earlier thread that was possible on the 1.x branch so wondering if it can be done on 2.2?
I really want to use and support this plug in as it would really make our workflow much more efficient. Just need to figure out a solution for this audio bitrate since QC will only accept it if audio is 320k...
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I tried beta4, and the same thing. However I did see something interesting. It appears that for bitrates 256Kb/s and up, it uses VBR however 192Kb/s and below it uses CBR.
128k log:
Code
Alles anzeigen[16:59:48] --------------------------------------------- [16:59:48] Export started [16:59:48] --------------------------------------------- [16:59:48] Opening codec: libx264 with options: [16:59:48] Opening codec: aac with options: b=128000|profile=aac_low [16:59:48] --------------------------------------------- [16:59:48] Frame size: 1920x1080 [16:59:48] Pixel aspect: 1:1 [16:59:48] Frame rate: 29.97 [16:59:48] Interlaced: No [16:59:48] Color range: Limited [16:59:48] Color space: bt.709 [16:59:48] Passes: 1 [16:59:48] Sample rate: 48000 Hz [16:59:48] Audio channels: 2128k Media Info:
Code
Alles anzeigenAudio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 2 min 5 s Duration_LastFrame : -16 ms Bit rate mode : Constant Bit rate : 132 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 1.95 MiB (4%) Default : Yes Alternate group : 1192k log:
Code
Alles anzeigen[17:02:16] --------------------------------------------- [17:02:16] Export started [17:02:16] --------------------------------------------- [17:02:16] Opening codec: libx264 with options: [17:02:16] Opening codec: aac with options: b=192000|profile=aac_low [17:02:16] --------------------------------------------- [17:02:16] Frame size: 1920x1080 [17:02:16] Pixel aspect: 1:1 [17:02:16] Frame rate: 29.97 [17:02:16] Interlaced: No [17:02:16] Color range: Limited [17:02:16] Color space: bt.709 [17:02:16] Passes: 1 [17:02:16] Sample rate: 48000 Hz [17:02:16] Audio channels: 2192k Media Info:
Code
Alles anzeigenAudio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 2 min 5 s Duration_LastFrame : -16 ms Bit rate mode : Constant Bit rate : 192 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 2.85 MiB (6%) Default : Yes Alternate group : 1256k log:
Code
Alles anzeigen[17:15:34] --------------------------------------------- [17:15:34] Export started [17:15:34] --------------------------------------------- [17:15:34] Opening codec: libx264 with options: [17:15:34] Opening codec: aac with options: b=256000|profile=aac_low [17:15:34] --------------------------------------------- [17:15:34] Frame size: 1920x1080 [17:15:34] Pixel aspect: 1:1 [17:15:34] Frame rate: 29.97 [17:15:34] Interlaced: No [17:15:34] Color range: Limited [17:15:34] Color space: bt.709 [17:15:34] Passes: 1 [17:15:34] Sample rate: 48000 Hz [17:15:34] Audio channels: 2256k Media Info:
Code
Alles anzeigenAudio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 2 min 5 s Duration_LastFrame : -16 ms Bit rate mode : Variable Bit rate : 211 kb/s Maximum bit rate : 256 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 3.14 MiB (6%) Default : Yes Alternate group : 1Does that give any clues?
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Version 2.2. Installed using installer-2.2.exe that I downloaded this morning. Should I try the 2.3 beta then?
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Here's the log file:
Code
Alles anzeigen[15:28:52] --------------------------------------------- [15:28:52] Export started [15:28:52] --------------------------------------------- [15:28:52] Frame size: 1920x1080 [15:28:52] Pixel aspect: 1:1 [15:28:52] Frame rate: 29.97 [15:28:52] Interlaced: No [15:28:52] Color range: tv [15:28:52] Color space: bt709 [15:28:52] Color primaries: bt709 [15:28:52] Color TRC: bt709 [15:28:52] Sample rate: 48000 [15:28:52] Audio channels: 2 [15:28:52] --------------------------------------------- [15:28:52] Opening codec: h264_nvenc with options: b=10000000|gpu=0|preset=hq|profile=high|rc=cbr [15:28:52] Opening codec: aac with options: b=320000|profile=aac_low [15:28:53] Requesting pixel format: yuv420p [15:28:53] Frame #0: vRender: 118361 us, vProcess: 3 us, vEncoding: 2049 us, Latency: 120445 us [15:28:53] Frame #1: vRender: 71245 us, vProcess: 3 us, vEncoding: 594 us, aRender: 27 us, aEncoding: 235 us, Latency: 152691 us … [15:47:38] Frame #63307: vRender: 73683 us, vProcess: 3 us, vEncoding: 984 us, aRender: 34 us, aEncoding: 1583 us, Latency: 133290 us [15:47:38] Frame #63308: vRender: 19595 us, vProcess: 3 us, vEncoding: 957 us, aRender: 40 us, aEncoding: 130 us, Latency: 20742 us [15:47:38] Exported 63308 frames in 1125 seconds. (avg. 56 fps) [15:47:38] Flushing encoders and finalizing ... [15:47:38] Video and audio buffers flushed. [15:47:38] Trailer has been written. [15:47:38] Closing encoders ... [15:47:38] --------------------------------------------- [15:47:38] Export finished [15:47:38] ---------------------------------------------And it still did audio in VBR:
Code
Alles anzeigenAudio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 35 min 12 s Bit rate mode : Variable Bit rate : 219 kb/s Maximum bit rate : 320 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 55.1 MiB (2%) Default : Yes Alternate group : 1Any ideas?
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Yeah, I did see that. But it's only making VBRs for me. How can I figure this out?
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Interesting... so it is doing VBR.
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 11 min 50 s
Bit rate mode : Variable
Bit rate : 233 kb/s
Maximum bit rate : 320 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 19.7 MiB (1%)
Default : Yes
Alternate group : 1
I thought I could add custom parameters into the encoder dialog but I guess not. Is there somewhere else I can look to force it to do CBR?
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That's exactly how my export settings look. How can I see the "Code" view that you have above?
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Is there a way using the Premiere / MediaEncoder plugin to use CBR AAC using the FFMpeg encoder? It seems to always produce VBR audio even if the video codec is set to CBR. For example, on one project the highest audio bitrate it will produce is 232Kb/s (according to FFmpeg -i) if you set it any higher than 192k.
The issue is our master control has a QC check that requires the audio bitrate to be > 300Kb/s and if the metadata says anything less it will fail the asset right away.
UPDATE:
According to this, AAC by default (-v 0) will be CBR:
http://wiki.hydrogenaud.io/index.php?titl…K_AAC#Bandwidth
Something else is going on here then… no matter what I set it to, any bitrate greater than 192Kb/s will result in the audio bitrate being 232Kb/s.
According to ffmpeg -I:
"Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 232 kb/s (default)"
Any ideas?