Bitrate refers to the amount of information transferred or processed per unit of time, usually expressed in bits per second (bit/s) or multiples thereof. Bitrate can be used to express a number of things, such as the bandwidth of a computer interface, the level of quality of a digital audio or video ...

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How is Windows Explorer calculating Data Rate?

When I add the "Data Rate" column in Windows Explorer and look at Windows Media Video files, it is showing a value that's much higher than expected. This is in Windows 7 64-bit. For example, the ...
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202 views

FFMPEG encoding settings for 1080/60fps/h264 - framedrops

I want to use latest ffmpeg to encode set of JPG frames to 1920x1080 60fps h.264 movie. I'm looking for set of parameters that will allow smooth playback of encoded video on fairly strong PC machines ...
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1answer
23 views

Is it possible for ffmpeg to encode with a spatially variable bit rate?

I would like to reduce the overall bitrate of a 4K 180 degree FOV video by decreasing detail outside of 60 degrees while retaining it in the center. Is that possible?
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45 views

ffmpeg bitrate variating without reason

I got a mp4 video. I just want to split it in 4GB file parts using ffmpeg (to make it writeable on FAT32). C:\ffmpeg\ffmpeg.exe -i "%NAME%.mp4" -n -t %LENGTH% -codec copy "%NAME%_1.mp4" ...
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65 views

VLC streaming upload buffer

I'm trying to stream a Variable bitrate stream over the internet: Video is Variable between 8-10MBit Audio is Constant @ 256KBit My upload at home is a steady 10Mbit. The downstream of the place ...
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0answers
446 views

Difference between downscaling 1080p to 720p in real time and downscaling during encoding?

Suppose a high quality, uncompressed video is re-encoded twice, with almost identical encoding settings at a relatively low bitrate of 4mbps, but at different resolutions, first at 1080p, and then at ...
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105 views

Recommended bit-rate value for x264 1st pass

I use x264 to encode content for an Adaptive Bit-Rate workflow. So I run a 1st pass to find the "optimal"GOP structure (but with a --keyint target value) to a given bit-rate X. And next I run ...
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1answer
113 views

How does video encoding bitrate affect duration and why?

Does encoding an uncompressed video into a higher bitrate take longer (than into a lower bitrate)? If so, why - it seems that the encoder should need less effort because it doesn't have to compress ...
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1answer
272 views

1080p 10bit MKV Video is Choppy but Has Smaller File-size?

I've tried VLC, MPC-HC with LAV and CCCP but nothing worked for 1080p 10bit MKV. The video is not always choppy but only during some particular scenes with high content bitrate. I've got 2 versions ...
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1answer
151 views

Solution for choppy video because of bit-rate too high?

When I play a 1080p 10bit-depth video with VLC-player, the video goes choppy and even freezes. I'm using Dell Inspiron 1525 and VLC 2.1.2. Windows Vista Home Premium. Mobile Intel(R) 965 Express ...
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2answers
225 views

How does ffmpeg determine individual stream bitrates?

For example, I have a video for which ffmpeg shows Duration: 00:46:43.72, start: 0.540000, bitrate: 2593 kb/s Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR ...
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1answer
117 views

Filter the video while keeping the bitrate (FFmpeg)

For experimental purposes, I need to filter my video (using -vf option) and change, say, brightness, but keep the same bitrate as in original video. Just for testing purposes, I change RGB values to ...
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2answers
199 views

Can someone explain to me the correlation between bit rate and frame rate?

I understand the higher the FPS, the smoother the image will look at your current resolution. This also corresponds to refresh rate over the monitor. Your FPS can only go as high as your refresh rate ...
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92 views

Sound forge changes bit rate when overwritting

In Sound Forge 10.0 I cannot keep the same bitrate whenever i overwrite a file. Any solution? My Template box at the "Save as" dialog box is set up for 128 Kbps. If If I rename the file it will be ...
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1answer
505 views

reaching constant video bitrate by using ffmpeg

We use ffmpeg and a transcoding script for transcoding and want to make some batch files which we can use for transcoding. For example I use a parameter called video_kbit and if I am writing in ...
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1answer
232 views

How do I check the video bitrate of an Ogg Theora (ogv) video file?

I've been sent an .ogv file by a video company that's 4 times the file size of the equivalent MP4 file. I suspect they've encoded it at way too high a bitrate, but I'd like to check for sure. I'm on ...
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3answers
1k views

How much data does SSH typically use?

I want to ssh into a laptop (Ubuntu) which will be connected through a 3G connection. Therefore I need to estimate how much data I will be using to choose a suiting plan. Separate from file transfer, ...
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1answer
1k views

Video compression with ffmpeg - Constant quality

I am trying to compress videos of 10 seconds at different bitrates with ffmpeg. My aim is to obtain the same video at different qualities (from very low to very high). I don't want to touch audio part ...
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1answer
1k views

avconv mkv to mkv with audio compression bug

In order to make quality tests, I would like to compress the audio part (to a low bitrate) of a matroska file without damaging video. Audio codec is AAC and video codec is H264. I am using avconv on ...
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1answer
897 views

ffmpeg .mkv to .mkv with audio .aac compression

I am trying to use ffmpeg on a .mkv video to change soundtrack quality. I would like to lower the bitrate of the audio part (to 16 kbps) without any modification of the video. Nevertheless when I use ...
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1answer
40 views

Explanation on network transfer bit rate R

Bit Rate R usually refers to: Number of bits transferred in unit of network time on a link L. I am curious on the sending direction of R. Because data on link L has two directions. Does R means ...
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1answer
649 views

How to see media files (namely `flv`) details/info in Windows 7?

I see that for many media files, under Properties/Details there are some needed info like audio/video bitrate, but it seems limited - for example it does not work for flv. Is there a way that would ...
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13answers
13k views

Does it make sense converting a file to a higher audio bitrate?

When a certain file (mp4, flv, etc) has a 95 kbps audio bitrate - does it make sense outputing to a higher bitrate when converting to mp3 or other format (be it lossy or not)? Would this result in ...
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1answer
440 views

Lower the bitrate of a lossless m4a file

When I try to sync my music library to my iPod touch using iTunes it says that some songs can't be synchronized because the sample rate is too high. Indeed, some files have a bitrate of ~3000 kbps. ...
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278 views

view video bitrate of a flv file in linux,how?

Is there any command to check the video bitrate of a flv file in debian/ubuntu ? I have some flv files and I want to find out their video bitrate. I check 'file' command It only says 'Macromedia ...
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6k views

FFmpeg: Keeping quality during conversion [duplicate]

Possible Duplicate: Convert AVI to MP4 keeping the same quality I'd like to convert a good amount of wmv, mpg and avi files (with differing audio and video encodings) to mp4/x264/aac with ...
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1answer
482 views

Media Information for Constant and Variable bit rate of Video files

What is this Maximum bit rate for a .mp4 format file whose bit rate mode is Constant? Media information displayed for MP4 (Using MediaInfo Tool) ID : 1 Format : AVC Format/Info : Advanced Video ...
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412 views

Trancoding a video with vlc and the MPEG-4 codec with a video bit rate

When I try to trancode a video with vlc using the MPEG-4 codec and a video bit rate, I get the following error : Either both buffer size and max rate or neither must be specified Here is the ...
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3answers
356 views

Why are mp3 bitrates usually multiples of 32? (powers of 2)

I understand why multiples of 2 show up so often in with computers because of their binary nature, but I haven't been able to figure out the most common mp3 bitrates (64kbps, 128kbps, 160kbps, ...
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1answer
5k views

Change bitrate of MP4 file

I have to change the bitrate of MP4 files on Mac OS X. What's the best tool to do this conversion? Am I able to do it with QuickTime?
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1answer
92 views

How BroadcomVoice16 use 2-bits per sample to produce voice?

BroadVoice16 (BV16) is a speech codec that operates at an input sampling rate of 8 kHz and an encoding bit rate of 16 kb/s, or 2 bits per sample. That's an excerpt from BroadVoice 16 Speech Codec ...
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1answer
840 views

Why does FFMPEG adds up extra bit rate to video?

I use FFMPEG (command line Input) to convert my videos to a specific output format. The problem I am facing is when I try to pass a constant bit rate(700 kbps) to FFMPEG, the result is an output ...
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2answers
1k views

Why G.722 has 64 kbps bit rate?

I'm learning a few things about codec, and now I'm confused by G.722. There's a way to calculate codec bit rate that I read here on wikipedia. It said: bit rate = sampling rate x bit depth G.722 has ...
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3answers
2k views

How to know whether a audio file is CBR or VBR?

File size of an CBR(Constant bitrate) audio recording can be calculated using a formula: File Size (Bytes) = (sampling rate) × (bit depth) × (number of channels) × (seconds) / 8 E.g., a 70 minutes ...
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0answers
737 views

How to generate a 8 bit per sample wav audio file in VLC

I'm using the following vlc command line to extract first 5 minutes of audio from video file "-I dummy -vvv --no-sout-video --sout-audio --no-sout-rtp-sap --no-sout-standard-sap --ttl=1 ...
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2answers
4k views

What does the sample rate and sample size of audio means?

In a MP3 audio file, I know theres a bitrate of audio which tells the number of bits in seconds are being used by the player, in other words a measure of quality of audio. But I'm confused with the ...
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votes
1answer
1k views

Optimal Audio Codec and corresponding format/option for the recording of voice in small and large lecture halls

Microsoft's OneNote supplied with Office2010 does very well for note taking software. It includes the function to record audio/video, or just audio. The options in the program for Codec are a) Windows ...
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1answer
10k views

What is a good, high quality data rate for mp4? [closed]

I am exporting a 720p at 30 fps video from Final Cut Pro 6 using quicktime conversion. It has a field for data rate with no presets. What is a high mp4 quality data rate (in kbps) that isn't grainy?
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1answer
553 views

Is YouTube bitrate the same for every video at a given resolution? [closed]

What format does YouTube use for compressing videos? I think it's FLV or H.264, but I'm not sure. Is every video encoded with the same bitrate? Put another way: Does my video load faster if I upload ...
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1answer
134 views

How bitrate changes with screen size

I'm trying to DVDrip a 320x240 screen .m4v video. Is there some way to mathematically know the bitrate for the required screen size so that there will be no distortions and you can know the closest ...
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votes
3answers
3k views

Video encoding for mobile: How do I choose FPS and bit rate?

I'm going to encode a video from DVD to mobile supported format (mp4, flv, H.263). For a 320x240 screen if I choose around 600 kb/s, how would I know FPS that I want? How is the bitrate is related to ...
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votes
4answers
11k views

How to specify audio and video bitrate

I have a mov file with the following media information: Stream 0 Type: Video Codec: H264-MPEG-4 AVC (part 10)avc1 Language: English Resolution: 1280x720 Frame rate: 24 Stream 1 Type: Audio Codec: ...
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votes
1answer
3k views

How to change audio frequency?

I want to change the frequency of an audio file. Meaning: the whole file should sound (say) one octave higher or lower. How to do it? Using ffmpeg or other command line open source tool would be ...
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1answer
280 views

Would NTFS Compression actually speed up the use of USB flash drives?

When using NTFS on USB flash drives, would using NTFS compression make them faster? With fast processors and limited USB bit rate, it seems feasible that it might, and would also have the benefit ...
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2answers
12k views

How to find out what the bitrate is of my audio file?

I wondered how I could find out what the bitrate is of my ogg audio file? My Operating System is Windows 7 32 bit, if that would make any difference.
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1answer
832 views

How to see the video bit rate of an AVI file

I'm trying to add subtitles to an AVI file while minimizing loss in video quality. I can adjust the quality by setting the bitrate in mencoder. I would like to know the bitrate of the original file in ...
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3answers
12k views

What's the minimum speed internet connection required to stream online video

I know it depends on the bitrate of the video, but in general if I want to watch youtube, hulu or netflix without constant interruptions is 1.5 Mbps good enough? is 3.0 Mbps good enough?
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3answers
400 views

Audio file Bitrate

how do you determine whether an audio file was ripped at the same bitrate as its tags claim? I mean, you could always rip it at a low rate and re-encode it with a higher bitrate (of course the quality ...
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1answer
3k views

Optimal iPad video settings?

I'm converting some video to put on an iPad, and recently MPEGStreamclip has been producing unsatisfactory results when I try and load it onto the device. What are the optimal video settings for an ...
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0answers
371 views

What is the bitrate of itunes streaming

I've been using itunes streaming (in part cause its easy) to access my music collection between two windows PCs. I'm half certain it sounds kinda 'flat' so i'm wondering, what bitrate it uses, and ...