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20th December 2009, 16:33 | #1 | Link | |
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ffmpeg -b -minrate -maxrate -bufsize
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Alright! I want to have ffmpeg encode something at no more than 110 kbit/s (or kbps). I have tried '-b 110' but this does not work. A buddy and I did some research, and apparently you have to take advantage of minrate, maxrate, and bufsize (required for minrate and maxrate). For clarification, "4000k" is "4000 kbit/s or kbps." This is what I want to know: what is and exactly does bufsize do? What is "video buffer verifier buffer size" (someone please call the Department of Redundancy Department)?
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20th December 2009, 17:40 | #2 | Link | |
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-b 110 means "110 bits per second". I don't think that's what you mean. What do you mean by "no more than 110kbps"? Do you mean an average bitrate of 110kbps? That's what -b is for. Do you mean a local bitrate not exceeding 110kbps? If so, why? |
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20th December 2009, 17:44 | #3 | Link | ||
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I am just trying to set the bitrate to 110kbps (the -b 110 would probably be more correct if I appended 'k' to '110'). In combination with a bitrate calculator, I am trying to make sure the encoded video will be around a specific filesize (such as 150 MB).
EDIT: Just tried it...but instead of displaying a bitrate of ~110kbps, it's all the way up to 300kbps (which is NOT what I want). Quote:
Quote:
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20th December 2009, 17:46 | #4 | Link |
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What you're looking to do has absolutely nothing to do with maxrate, minrate, or bufsize, and you should not be using those options.
Perhaps the reason that it's not giving you the bitrate you want is because your bitrate is below the lowest possible bitrate given the codec, qmax, and resolution? |
20th December 2009, 17:54 | #5 | Link |
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Well then how do I encode FoldKora.mkv (698 MB, 320x240, x264 codec / avc1 format, 25fps, ? bitrate, 128kbps MP3 @ 48000 Hz) to FLV (~150 MB, 240x180, 25fps, 64kbps audio @ 44100 Hz)?
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20th December 2009, 18:11 | #6 | Link |
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FLV supports H.264; use x264 instead. Read the guide.
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20th December 2009, 18:31 | #7 | Link | ||
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Quote:
Quote:
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21st December 2009, 20:00 | #9 | Link |
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Thanks Dark Shikari!
One thought I was having -- if you or someone else could clear this up -- upon executing the first line in that batch, it would save a file FoldKoraFLV.mp4 (or FLV if I changed MP4). Then it would execute the second line after finishing that task -- wouldn't this overwrite FoldKoraFLV.mp4/flv and thus undo the first line's work? How do this part work?
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21st December 2009, 20:07 | #10 | Link |
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The first pass doesn't need to write a video file at all, it writes a stats file which contains the information needed for the second pass. When the second pass is run, this file is read.
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17th January 2010, 23:55 | #11 | Link |
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Finally got the opportunity to try this out.
ffmpeg.bat Code:
ffmpeg -i hq700.mp4 -an -pass 1 -vcodec libx264 -vpre fastfirstpass -b 112k -bt 112k -threads 0 -s 240x180 lq150.mp4 ffmpeg -i hq700.mp4 -acodec libfaac -ab 64k -pass 2 -vcodec libx264 -vpre hq -b 112k -bt 112k -threads 0 -s 240x180 lq150.mp4 Code:
C:\Program Files (x86)\megui\tools\ffmpeg>ffmpeg.bat C:\Program Files (x86)\megui\tools\ffmpeg>ffmpeg -i hq700.mp4 -an -pass 1 -vcode c libx264 -vpre fastfirstpass -b 110k -bt 110k -threads 0 -s 240x180 lq150.mp4 FFmpeg version SVN-r20900-Sherpya, Copyright (c) 2000-2009 Fabrice Bellard, et a l. built on Dec 20 2009 03:53:05 with gcc 4.2.5 20080919 (prerelease) [Sherpya] libavutil 50. 7. 0 / 50. 7. 0 libavcodec 52.43. 0 / 52.43. 0 libavformat 52.44. 0 / 52.44. 0 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.12. 0 / 1.12. 0 libswscale 0. 7. 2 / 0. 7. 2 libpostproc 51. 2. 0 / 51. 2. 0 Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 25.00 (25/1) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hq700.mp4': Metadata: major_brand : isom minor_version : 1 compatible_brands: isomavc1 Duration: 01:57:19.56, start: 0.000000, bitrate: 833 kb/s Stream #0.0(und): Video: h264, yuv420p, 720x576 [PAR 1:1 DAR 5:4], 727 kb/s, 50 fps, 25 tbr, 25k tbn, 50 tbc Stream #0.1(und): Audio: mp3, 48000 Hz, 2 channels, s16, 102 kb/s File for preset 'fastfirstpass' not found C:\Program Files (x86)\megui\tools\ffmpeg>ffmpeg -i hq700.mp4 -acodec libfaac -a b 64k -pass 2 -vcodec libx264 -vpre hq -b 110k -bt 110k -threads 0 -s 240x180 lq 150.mp4 FFmpeg version SVN-r20900-Sherpya, Copyright (c) 2000-2009 Fabrice Bellard, et a l. built on Dec 20 2009 03:53:05 with gcc 4.2.5 20080919 (prerelease) [Sherpya] libavutil 50. 7. 0 / 50. 7. 0 libavcodec 52.43. 0 / 52.43. 0 libavformat 52.44. 0 / 52.44. 0 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.12. 0 / 1.12. 0 libswscale 0. 7. 2 / 0. 7. 2 libpostproc 51. 2. 0 / 51. 2. 0 Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 25.00 (25/1) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hq700.mp4': Metadata: major_brand : isom minor_version : 1 compatible_brands: isomavc1 Duration: 01:57:19.56, start: 0.000000, bitrate: 833 kb/s Stream #0.0(und): Video: h264, yuv420p, 720x576 [PAR 1:1 DAR 5:4], 727 kb/s, 50 fps, 25 tbr, 25k tbn, 50 tbc Stream #0.1(und): Audio: mp3, 48000 Hz, 2 channels, s16, 102 kb/s File for preset 'hq' not found File for present 'hq' not found. X_x
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18th January 2010, 02:56 | #13 | Link |
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Where would these presents be?
EDIT: Been Googling it and looking everywhere in ffmpeg documentation and can't find that parameter..
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18th January 2010, 18:15 | #15 | Link |
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I don't have any ffpreset files. I am getting this ffmpeg.exe through MeGUI. I searched my harddrive for "*.ffpreset", "ffpreset", and "fastfirstpass" with no results for any. ffmpeg.org does not seem to have anything but SVN related downloads.
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18th January 2010, 18:23 | #16 | Link | |
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18th January 2010, 19:57 | #17 | Link |
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Alright. I have ffmpeg.exe and *.ffpreset files in E:\Videos\Teremtes\. In the same directory I have hq700.mp4 and ffmpeg.bat. Here is ffmpeg.bat:
Code:
ffmpeg -i hq700.mp4 -an -pass 1 -vcodec libx264 -fpre "C:\Program Files (x86)\megui\tools\ffmpeg\libx264-fastfirstpass.ffpreset" -b 112k -bt 112k -threads 0 -s 240x180 lq150.mp4 ffmpeg -i hq700.mp4 -acodec libfaac -ab 64k -pass 2 -vcodec libx264 -fpre "C:\Program Files (x86)\megui\tools\ffmpeg\libx264-hq.ffpreset" -b 112k -bt 112k -threads 0 -s 240x180 lq150.mp4
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19th January 2010, 13:08 | #18 | Link |
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Yes, that is what you are supposed to do
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25th January 2010, 18:04 | #19 | Link |
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I ran the batch on two videos, and both of them turned out weird. I will explain what I mean by "weird" later. Is ffmpeg supposed to automatically mux in the audio to the resulting files? Another thing is that neither have audio like their high quality originals.
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25th January 2010, 19:57 | #20 | Link | |
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