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Old 08-29-2008, 06:52 PM   #1
LeeR
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Default H.264 vs. MPEG-2 file sizes?

Hello all. New to the forums, but not to PC3. I am in the process of attempting to demonstrate the differences between MPEG-2 and H.264 formats for a client. I thought that I could save file size by using an H.264 file over an equal bit-rate MPEG-2.

Basically I took one source file and rendered out an MPEG-2 version and an H.264 version with identical bit rates. Same frame rates, resolution, etc. etc., and to my surprise the MPEG-2 file was about 200 MB and the H.264 was about 338 MB.

I used two of the included presets and modified them to suit my needs (1280x720, progressive, bit rate, etc.) and got these results. Can someone enlighten me as to why the H.264 is so much larger? It was my understanding that (roughly) an equal bit rate H.264 should be around 50-60% of the file size of an MPEG-2 encoded from the exact same file.

Thanks in advance for any help...

EDIT: Wanted to add that I am doing MPEG-2 transport streams on both file types. Although when using Media Info on my encoded files, it is reporting the H.264 file is actually in a MPEG-4 transport stream.

Last edited by LeeR; 08-29-2008 at 07:03 PM. Reason: Transport stream explanation
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Old 08-29-2008, 07:57 PM   #2
THoff
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What about the audio -- are you using identical settings?

Regarding the MPEG4 identification, H.264 is another name for MPEG4 Part 10.
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Old 08-30-2008, 07:21 PM   #3
LeeR
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Quote:
Originally Posted by THoff View Post
What about the audio -- are you using identical settings?

Regarding the MPEG4 identification, H.264 is another name for MPEG4 Part 10.
No, the audio for the MPEG-2 was the default standard, and the H.264 was set to AAC, but both were set to the same bitrate.

EDIT: The audio shouldn't have made that huge of a difference anyway, as the piece was only about two minutes long.

Last edited by LeeR; 08-30-2008 at 07:22 PM. Reason: Added length of encoded file
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Old 08-30-2008, 10:28 PM   #4
STORMDAVE
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H264 is more efficient at lower bitrates. You have to demonstrate the difference of the quality between the two codecs, but use a lower bitrate in H264 to get a visually identical image. Also use 2pass VBR for H264.
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Old 09-02-2008, 08:08 PM   #5
LeeR
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I re-encoded the same file using both MPEG-2 HD and H.264 HD presets, only altering resolution (1280x720), progressive scan (no fields), video bit rate (1.2Mbps average, 2-pass VBR, 2.5Mbps max) and audio bit rate (160Kbps).

MPEG-2 file: 69 MB
H.264 file: 71 MB

The MPEG-2 file looks like garbage, while the H.264 file looks pretty good, comparatively speaking.
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