Hi, I have 2 video with the same content but different setting of codec; if I see the properties from mediaplayer classic I have the following:
video 1
Format : Matroska
Format version : Version 1
File size : 4.74 GiB
Duration : 1h 53mn
Overall bit rate mode : Variable
Overall bit rate : 5 980 Kbps
Encoded date : UTC 2013-04-16 01:27:30
Writing library : WonderShare Matroska Muxer
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 53mn
Bit rate mode : Variable
Bit rate : 5 541 Kbps
Maximum bit rate : 8 473 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.240
Stream size : 4.39 GiB (93%)
Default : Yes
Forced : No
Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : A_AC3
Duration : 1h 53mn
Bit rate mode : Constant
Bit rate : 320 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : -40ms
Stream size : 260 MiB (5%)
Default : Yes
Forced : No
Video 2
Format : Matroska
Format version : Version 2
File size : 1.18 GiB
Duration : 1h 52mn
Overall bit rate : 1 501 Kbps
Encoded date : UTC 2013-04-16 05:41:27
Writing application : mkvmerge v6.1.0 ('Old Devil') built on Mar 2 2013 14:32:37
Writing library : libebml v1.3.0 + libmatroska v1.4.0
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 52mn
Bit rate : 1 387 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.060
Stream size : 1.07 GiB (91%)
Writing library : x264 core 130 r2273 b3065e6
Encoding settings : cabac=1 / ref=3 / deblock=1:-1:-1 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-3 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=1387 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Default : Yes
Forced : No
Audio
ID : 2
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Codec ID : A_MPEG/L3
Codec ID/Hint : MP3
Duration : 1h 52mn
Bit rate mode : Constant
Bit rate : 112 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 90.1 MiB (7%)
Language : Italian
Default : Yes
Forced : No
when I see the video seem that "video 2" video quality is better then "video 1" video quality while audio seem to be the same while properties of codec are very different; can you help me to choose the version with better quality? if you want a small part of video I can host it...
thx
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You can't tell much about the quality by looking at codec settings. Unless you know the videos were the same before encoding. The only way to really judge the quality is to view the videos yourself.
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Anonymous344Guest
Moreover, codec settings will not tell you if whoever encoded the video filtered it.
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The first video is compressed with an AVC encoder which supports only the Baseline profile. This is a very simple part of the whole technology. It requires a lot more bitrate than an encoding in Main or High profile for a similar quality.
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ok, I have understand, (however both video contain the same content recorded from the same broadcaster, but I don't know if the video are recorded both from digital satellite, terrestrial or one from satellite and the other from terrestrial; I see only that the video smaller seem to be better then the bigger and this is very strange)... Is very difficult for me choose because the quality is very similar...
for the audio, both dvb-t that dvb-s standard use 48000 hz such frequency, there is a program where I can import stream audio of both and see the spectrum of the audio and choose the best? How can I make this? -
Anonymous344Guest
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Video 1 was encoded with something called "WonderShare Matroska Muxer".
I just looked at their site. I can't see anyone who actually knows anything about how to encode using it.
Hence, #2 is probably better. That's my answer and I'm sticking to it. -
ok, I see that video2 has cabac coding,
2)for the audio, what can you tell me? I think (but I'm not sure) that dvb-t and dvb-s (assuming that the 2 video are made from different digital transmission but I'm not sure also in this case) use frequency as 48000 hz and the audio in video 1 seem to be best of the audio in video 2...it's correct? if I convert a wav file both into file1 (mp3) and into file2 (ac3) setting to both to the same bitrate and to the same frequency,what is the file with the best quality?
3)There is a mode to scan audio and view the better with sound spectrum?
4)if I have an audio with a bitrate and frequency, and I encoding with a frequency and bitrate upper, I have the same quality of original files or can happen that the quality worse? -
yes, multiplexing is another thing
I have written the broadcaster problem to answer jagabo that has write:
"You can't tell much about the quality by looking at codec settings. Unless you know the videos were the same before encoding. The only way to really judge the quality is to view the videos yourself."
I think that the video is the same before encoding, but my doubt is if are encoded with same settings both in dvb-s that dvb-t... -
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You can use MMG to mux, mix/match video and audio streams. Beware, you may find the audio from one file doesn't really match the video from another file. Commercials, credits, lead-in logos may have been cut differently. Broadcasts in different countries can have different scenes cut. Etc.
Spek, or Audacity with the ffmpeg source plugin, can import audio directly from almost any file and show you a the spectrum (though that's not the final arbiter of quality). -
I think it's a mistake to judge the audio the way you're doing. As far as I can tell, Italian digital television audio is generally encoded using MPEG1. It's possible the first AC3 audio was re-encoded from the original, whereas the second may actually BE the original. Of course, AC3 transmission is possible, but at that bitrate??? You really ought to listen to them and judge them on how they sound, not their statistics.
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Anonymous344Guest
I don't believe I've ever seen broadcast AC-3 with a bitrate other than 384kbps, regardless of whether it's 2.0 or 5.1.