[mythtv-users] mythtranscode and the HD-PVR

[Christopher Meredith]

On Thu, May 14, 2009 at 1:38 PM, belcampo <belcampo at zonnet.nl> wrote:
> Christopher Meredith wrote:
>>
>> On Thu, May 14, 2009 at 2:37 AM, belcampo <belcampo at zonnet.nl> wrote:
>>>
>>> Christopher Meredith wrote:
>>>>
>>>> On Wed, May 13, 2009 at 1:48 AM, belcampo <belcampo at zonnet.nl> wrote:
>>>>>
>>>>> Christopher Meredith wrote:
>>>>>>
>>>>>> On Tue, May 12, 2009 at 1:38 PM, belcampo <belcampo at zonnet.nl> wrote:
>>>>>>>
>>>>>>> Christopher Meredith wrote:
>>>>>>>>
>>>>>>>> On Tue, May 12, 2009 at 5:10 AM, belcampo <belcampo at zonnet.nl>
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> Christopher Meredith wrote:
>>>>>>>>>>
>>>>>>>>>> I know that we don't currently have lossless transcoding of HD-PVR
>>>>>>>>>> recordings. But do we have any form of transcoding? I have a
>>>>>>>>>> script
>>>>>>>>>> that converts the MythTV cutlist to an EDL for use with mencoder,
>>>>>>>>>> but
>>>>>>>>>> it is not as precise as I am used to.
>>>>>>>
>>>>>>> Could you provide this script ?
>>>>>>> I would be interested to see if it gives the same results as
>>>>>>> projectx,
>>>>>>> which
>>>>>>> has/is the same quality of cutting as mythtranscode, but also unable
>>>>>>> to
>>>>>>> work
>>>>>>> with HD-PVR material, only MPEG2 stuff.
>>>>>>
>>>>>> I actually got it from here:
>>>>>>
>>>>>> http://www.justlinux.com/forum/showpost.php?p=878967&postcount=4
>>>>>>
>>>>>> I just had to change the multiplier on lines 39 and 40 to 1001.60000
>>>>>> since my recordings have a framerate of 59.940. This script has been
>>>>>> working for me, but it is not as precise as I am used to and it does
>>>>>> require reencoding (no lossless conversion).
>>>>>
>>>>> If you would change your HD-PVR settings to a progressive format I
>>>>> think
>>>>> things will become a lot easier.
>>>>> There have been numerous posts on the mencoder and ffmpeg mailing lists
>>>>> about interlaced h264 files.
>>>>> Maybe it's worth a test on 1 or 2 files. You then also are able to use
>>>>> mencoder's " -oac copy -ovc copy " instructions, so no transcoding.
>>>>
>>>> The HD-PVR is recording in a progressive format. I have my cable box
>>>> set to only output 720p and that is the format of all my recordings.
>>>
>>> How do 720p and a framerate of 59.940 fit ??
>>
>> I don't know. Lots of frame duplication, I guess.
>
> No the HD-PVR is only able, to output at 25 for PAL or 29.97fps for NTSC.
> The software you're checking it with is obviously wrong. What does
>  mediainfo tell about these source files ?

*sigh*

General
ID                               : 0
Complete name                    : 1427_20090513000000.mpg
Format                           : MPEG-TS
File size                        : 1.78 GiB
Duration                         : 59mn 49s
Overall bit rate                 : 4 264 Kbps

Video
ID                               : 4113 (0x1011)
Menu ID                          : 1 (0x1)
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : Main at L4.0
Format settings, CABAC           : Yes
Format settings, ReFrames        : 4 frames
Duration                         : 59mn 45s
Bit rate                         : 3 711 Kbps
Width                            : 1 280 pixels
Height                           : 720 pixels
Display aspect ratio             : 16/9
Frame rate                       : 59.940 fps
Resolution                       : 24 bits
Colorimetry                      : 4:2:0
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.067

Audio
ID                               : 4352 (0x1100)
Menu ID                          : 1 (0x1)
Format                           : AC-3
Format/Info                      : Audio Coding 3
Duration                         : 59mn 49s
Bit rate mode                    : Constant
Bit rate                         : 384 Kbps
Channel(s)                       : 6 channels
Channel positions                : Front: L C R, Surround: L R, LFE
Sampling rate                    : 48.0 KHz
Video delay                      : -21ms