3 Replies Latest reply on Mar 14, 2009 12:52 PM by Jim_Simon

    FLV quality looks better than F4V, what am I doing wrong?

      Hi,

      I exported a small clip as a on2vp6 flv, a h.264 f4v, and a h.264 mp4 file with the adobe media encoder cs4. Each file is the same clip, exported with pretty much the same settings. Resolution: 640x480, 0.5mbps target bit rate, 29.97 fps.

      Everything I read says that for a given file and a given bitrate, h.264 should provide better video quality when compared to a h.263 flv file. I would like to know what I am doing wrong, because the h.264 files look worse than the flv file. I have provided download links for a short demo clip in each format.

      fl7756n_29_640x480_500kbpsbr.f4v
      http://www.filefactory.com/file/af5gc7b/n/fl7756n_29_640x480_500kbpsbr_f4v
      fl7756n_29_640x480_500kbpsbr.flv
      http://www.filefactory.com/file/af5gc7e/n/fl7756n_29_640x480_500kbpsbr_flv
      fl7756n_29_640x480_500kbpsbr.mp4
      http://www.filefactory.com/file/af5gc71/n/fl7756n_29_640x480_500kbpsbr_mp4

      Why does the clip look better in h.263? It seems that everything I encode at low bitrates looks better in h.263 which leads me to believe I am doing something wrong.
        • 1. Re: FLV quality looks better than F4V, what am I doing wrong?
          Jim_Simon Level 8
          My first guess would be that "everything you read" may not be correct. These are two different codecs. You may not be able to compare them apples to apples fashion.

          Meaning one codec may require a higher bitrate to provide the same level of quality as another.
          • 2. Re: FLV quality looks better than F4V, what am I doing wrong?
            Level 1
            Okay, that is true, they are different codecs. But even adobe says:

            Q: How does H.264 compare with the current video formats supported in Flash Player?
            A: Flash Player supports the Sorenson Spark video codec (based on H.263) and On2 VP6. H.263 is the predecessor of H.264 and was designed for teleconferencing applications, at 64k rates. H.264 delivers even higher quality at lower bitrates. H.264 will deliver the same or better quality when to compared to the same encoding profile in On2. Factors you should consider when choosing a format include the complexity of the content, the desired reach, ability to archive, and licensing considerations.

            at
            http://labs.adobe.com/wiki/index.php/Flash_Player:9:Update:H.264#Q:_What_is_H.264.3F

            Are there any tricks to getting the h.264 to look "better" than the h.263? Like, the h.264 version of the video doesn't even look close to as good, and I think that the f4v version looks worse than the mp4, which I don't really understand since they are both h.264 files. The footage is from a canon XL2 and the original source is ntsc 720x480. Is there anything special I should be doing for encoding in h.264 instead of h.263. The video is going to be only for the web.
            • 3. Re: FLV quality looks better than F4V, what am I doing wrong?
              Jim_Simon Level 8
              My only suggestion here is raise the bitrate.