11 Replies Latest reply on Apr 27, 2013 8:10 AM by the_wine_snob

    Pre 11 h264 + AC3 problem. Codec?

    Asembler1387900 Level 1

      Hi community,


      After importing a TS file, recorded via DVB-C and containing h264 with ac3 audio, Pre 11 behaves strange. The organizer tells me that a codec is missing if i want to open the video file. It also says that there is no audio. However, if i import the file into the editor it adds a very strange audio track. At the beginning, where the advertisement is, the audio is normal, but exactly when the film starts I only hear the background sound without any voices.

      As VLC needs very long loading time if i want to watch the film, I expect a codec problem. well, WMP plays the movie normal. Therefore I tried this codecs:





      Which other codec could I try or do you expect another problem?


      Best regards

        • 1. Re: Pre 11 h264 + AC3 problem. Codec?
          Steve Grisetti Adobe Community Professional

          The DVB-C apparently is producing a non-standard AVC file.


          What do you mean by a "TS file"? Do you mean an MTS?



          What model of camcorder is this video coming from? It would be best to edit it in its native format rather than convert it to a format that is, apparently,  not compatible with consumer software.

          • 2. Re: Pre 11 h264 + AC3 problem. Codec?
            Asembler1387900 Level 1

            Thanks for the fast reply!


            It is a *.ts file. VLC gives following codec information:



            Codec: H264 - MPEG-4 AVC (part 10) (h264)


            FPS: 100



            Codec: A52 Audio (aka AC3) (a52 )

            channels: 3F2R/LFE

            • 3. Re: Pre 11 h264 + AC3 problem. Codec?
              John T Smith Adobe Community Professional & MVP

              >recorded via DVB-C


              Is that a camera, or software that records some kind of streaming video?

              • 4. Re: Pre 11 h264 + AC3 problem. Codec?
                Asembler1387900 Level 1

                It is  recorded TV. I used that Software to record it.

                • 5. Re: Pre 11 h264 + AC3 problem. Codec?
                  the_wine_snob Level 9

                  It is likely that with video recorded from a TV broadcast signal, you are getting a stereo/2-channel Stream for the commercials, but the TV show is in DD 5.1 SS, and you are only getting part of that - probably just the LS and RS channels. The LF and RF, plus the Center Channel (where most dialog will usually be), are being lost.


                  Not knowing your recording program, I cannot tell you how to adjust it, for DD 5.1 SS capture and output. That will be a DD AC3 Stream too, but 6-channel, and not 2-channel.


                  Good luck,



                  • 6. Re: Pre 11 h264 + AC3 problem. Codec?
                    Asembler1387900 Level 1

                    Well, that is what I expected too.

                    But I think that the problem is caused by PrE (maybe an incorrect setting) because WMP plays it normally, even tough I have only stereo PC speakers.

                    • 8. Re: Pre 11 h264 + AC3 problem. Codec?
                      Asembler1387900 Level 1

                      Could it help to demux and remux the file? If yes, how to do it (without buying additional software)?

                      • 9. Re: Pre 11 h264 + AC3 problem. Codec?
                        the_wine_snob Level 9

                        It might, but only if the full 6-channels are included in the Audio Stream. If so, many programs, like Adobe Audition, can extract each channel, to be edited separately. Then, one could adjust, say the LF, RF and Center channels, as needed.


                        Though in a playback environment, I had similar with my master bedroom home theater system. I had a single-stage video receiver, which was DD 5.1 SS, and did a great job for just the bedroom. However, I had the audio feed going to the master bath, as well. That did not work well, as the stereo mixdown came from the LS and RS feeds ONLY. Hence, when there was a stereo signal, then I got good audio in the bathroom, but when the source was DD 5.1 SS, I only got LS & RS, so all dialog was missing. To counter this, I upgraded that receiver to a two-stage unit, and the second stage did the complete mixdown, of ALL 6-channels to traditional stereo, and suddenly, the dialog appeared from either 2-channel, or 6-channel source material.


                        The first thing that I would do, would be to take one of your video files, and run it through G-Spot, or MediaInfo, to see if you ARE getting the full 6-channels (or at least the "big 5," LF, RF, C, LS and RS - LFE is not really necessary, except for Hollywood productions, where there IS real LFE material). If you have 5 - 6 channels of Audio, then a program, like Audition, can help you out.


                        Good luck,



                        • 10. Re: Pre 11 h264 + AC3 problem. Codec?
                          Asembler1387900 Level 1

                          MediaInfo gives following information:






                          ID :1 (0x1)
                          Format :MPEG-TS
                          File size :9.55 GiB
                          Duration :2h 50mn
                          Overall bit rate mode :Variable
                          Overall bit rate :8 039 Kbps




                          ID :2001 (0x7D1)
                          Menu ID :1 (0x1)
                          Format :AVC
                          Format/Info :Advanced Video Codec
                          Format profile :High@L4.0
                          Format settings, CABAC :Yes
                          Format settings, ReFrames :4 frames
                          Format settings, GOP :M=3, N=15
                          Codec ID :27
                          Duration :2h 50mn
                          Bit rate :7 189 Kbps
                          Width :1 280 pixels
                          Height :720 pixels
                          Display aspect ratio :16:9
                          Frame rate :50.000 fps
                          Standard :Component
                          Color space :YUV
                          Chroma subsampling :4:2:0
                          Bit depth :8 bits
                          Scan type :Progressive
                          Bits/(Pixel*Frame) :0.156
                          Stream size :8.54 GiB (89%)




                          ID :2041 (0x7F9)
                          Menu ID :1 (0x1)
                          Format :AC-3
                          Format/Info :Audio Coding 3
                          Mode extension :CM (complete main)
                          Format settings, Endianness :Big
                          Codec ID :6
                          Duration :2h 50mn
                          Bit rate mode :Constant
                          Bit rate :448 Kbps
                          Channel(s) :6 channels
                          Channel positions :Front: L C R, Side: L R, LFE
                          Sampling rate :48.0 KHz
                          Bit depth :16 bits
                          Compression mode :Lossy
                          Delay relative to video :-474ms
                          Stream size :545 MiB (6%)


                          There should be 6 channels.

                          • 11. Re: Pre 11 h264 + AC3 problem. Codec?
                            the_wine_snob Level 9

                            OK, you do have 6-channel, so you can use one of many audio-editing programs (do not know that many, as I use Adobe Audition almost exclusively) to get what you want. I would go for a sub-mix of LF + RF + C, and leave LS, RS and LEF out, unless you want the LFE's and some ambiance from the LS and RS.


                            PrPro CS 6 has the ability to breakout to mono, for 6-channel Streams, and one can map, re-map or use sub-mixes to get what you want, but I do not think that there is a way to easily breakout a 6-channel Stream to the mono components.


                            Good luck,