VideoHelp Forum
+ Reply to Thread
Results 1 to 7 of 7
Thread
  1. Member
    Join Date: May 2014
    Location: Split, Croatia
    Search Comp PM
    Hello, i'm looking for best encoding settings for audio w. still image.
    Source audio is FLAC 96KHz so audio should be encoded in highest quality possible (main concept avc has settings 96Khz 512kpbs so I'd use that?). What about video? Which settings can I use to reduce size and rendering time but w/o audio quality loss? I'm using Vegas 13. Thx in advance.
    My PC: MBO: Gigabyte GA-990XA UD3 // CPU: AMD FX-6300 3.5GHz // GPU: AMD HD 7790 1GB //
    RAM: Kingston 8GB 2400MHz // HDD: WD Blue 1TB
    Quote Quote  
  2. Long GOPs, low frame rates, low bitrates. Exactly what codec, frame rate, GOP length, and bitrate to use depends on your intended playback device. For example, here's an hour long 640x480 video in only 140 KB. It took 5 seconds to encode (not with Vegas).

    Code:
    Video
    ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : Baseline@L2.2
    Format settings, CABAC                   : No
    Format settings, ReFrames                : 1 frame
    Codec ID                                 : V_MPEG4/ISO/AVC
    Duration                                 : 1h 0mn
    Width                                    : 640 pixels
    Height                                   : 480 pixels
    Display aspect ratio                     : 4:3
    Frame rate mode                          : Constant
    Frame rate                               : 0.999 fps
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Progressive
    Writing library                          : x264 core 138 r2358kMod 9e941d1
    Encoding settings                        : cabac=0 / ref=1 / deblock=0:0:0 / analyse=0:0 / me=dia / subme=0 / psy=1 / fade_compensate=0.00 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=1 / scenecut=0 / intra_refresh=0 / rc=crf / mbtree=0 / crf=20.0000 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=0
    Language                                 : English
    Default                                  : Yes
    Forced                                   : No
    Attached Files
    Last edited by jagabo; 8th May 2014 at 07:57.
    Quote Quote  
  3. Member
    Join Date: May 2014
    Location: Split, Croatia
    Search Comp PM
    This is for youtube (obv). I read that resolution should be HD 720p minimally for high quality audio cuz YT encodes differently for HQ and HD. Does FPS and bitrate affect audio quality even if its set to highest (thats my goal) ?
    My PC: MBO: Gigabyte GA-990XA UD3 // CPU: AMD FX-6300 3.5GHz // GPU: AMD HD 7790 1GB //
    RAM: Kingston 8GB 2400MHz // HDD: WD Blue 1TB
    Quote Quote  
  4. vanished El Heggunte's Avatar
    Join Date: Jun 2009
    Location: Misplaced Childhood
    Search Comp PM
    When I had a YT channel, I uploaded a few clips at 640x480, and the audio of their FLV reencodes was at 128kbps (average).

    IMO it's unlikely that Google will dedicate more bitrate to audio, only because of a higher video resolution.

    Also, YouTube still resamples "everything" to 44.1kHz
    Quote Quote  
  5. Member
    Join Date: Sep 2007
    Location: Canada
    Search Comp PM
    Originally Posted by El Heggunte View Post

    IMO it's unlikely that Google will dedicate more bitrate to audio, only because of a higher video resolution.
    They have for a few years and still do, at least unless something changed recently

    (open up the comparision chart)
    http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs




    Also, YouTube still resamples "everything" to 44.1kHz
    If vimeo is an option for the OP , I think they allow 48Khz now

    Also you used to be able to get audio passthough with blip.tv , if you upload in FLV (e.g. you can use 320kbps MP3 which will sound better than 192kbps AAC that YT uses)
    Quote Quote  
  6. Originally Posted by knez18 View Post
    Hello, i'm looking for best encoding settings for audio w. still image.
    Source audio is FLAC 96KHz so audio should be encoded in highest quality possible (main concept avc has settings 96Khz 512kpbs so I'd use that?). What about video? Which settings can I use to reduce size and rendering time but w/o audio quality loss? I'm using Vegas 13. Thx in advance.
    Vegas does not have advanced settings for this sort of a problem, it will export huge video even if you set bitrate really low, I think it will even override that bitrate setting if I remember correctly, or the video will be garbage of some sort.
    You have to get uncompressed or lossless (after you install some lossless codec to PC) out of Vegas and then use x264 encoder.
    Or use debug mode frame server , avisynth and x264 encoder, where simple line could be:
    Code:
    x264 --crf=18 --keyint infinite --output out.264 input.avs
    that key thing is --keyint infinite, where it does not set keyframes, ....., input.avs for progressive source could be:
    Code:
    AviSource("input.avi")
    ConvertToYV12(matrix="PC.709")
    Where input.avi is debugmode's frame servers exported avi.
    Then mux that AAC audio and video into mp4 with mp4boxgui for example.
    In that older thread I tested that and uploaded to Youtube with no problems.
    Quote Quote  
  7. , you have still image only, slow thinking, you can generate that avisynth script with still image only http://avisynth.nl/index.php/ImageSource, so no need of uncompressed video or debug mode frame server generating video
    Quote Quote