[FFmpeg-user] Problem trying to convert PAL file to NTSC

belcampo belcampo at zonnet.nl
Thu Mar 17 14:08:52 CET 2011


On 03/17/11 13:25, vsethi at iglou.com wrote:
> belcampo wrote:
>
>>>> I wrote originally:
>>>>
>>>> I have a video file in PAL format currently sitting on the hard drive.
>>>> Mplayer 4.1.12 under X11 is able to play it (although slowly).
>>>> However, ffmpeg cannot do anything with it and complains about the
>>>> file header.
>>>>
>> Your version seems be to be very up-to-date, so that shouldn't be the
>> reason, but trying with an other/older version should not hurt.
>> What do you mean with "(although slowly)" ?
>
> The image that mplayer generates is clear, but playback is in slow motion.
> Since I'm an mplayer newbie as well, I don't know how to persuade it to
> speed up (if indeed it can).
>
> This is what mplayer 4.1.2 says about the file:
>
> ========================================================================
> MPEG-PS file format detected.
> VIDEO:  MPEG2 720 X 576 (aspect 2) 25.000 fps 8648.0 kbps (1081.0 kbyte/s)
> Opening video decoder: [mpegpes] MPEG 1/2 video passthrough
> Could not find matching colorspace -retrying with -vf scale ...
> Opening video filter: [scale]
> The selected video_out device is incompatible with this codec.
> Try appending the scale filter to your filter list.
> e.g. -vf spp.scale instead of -vf spp.
> V decoder init failed:(
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
> Starting playback...
> Movie-Aspect is 1:33:1 - prescaling to correct movie aspect.
> VO: [x11] 720 x 576 =>  768 x 576 Planar YV12
> [swscaler @ 0x899bae0] using unscaled yuv420p ->  brga special converter
> V: 2.7 183000/183000 121% 188% 0.0% 0 0 $<50>
> ========================================================================
>
> Which older version do you recommend trying and where does one get it?
I don't know which distribution of linux you are using; or would be able 
to compile one yourself. On http://www.ffmpeg.org/download.html at the 
bottom of the page are versions 5.3 and 6.1 from 2010 October. These are 
source files which  you have to compile yourself.
>
> Would it be relevant that the mplayer version is older than the ffmpeg
> version?
>
> Here again is the ffmpeg output on this file:
>
>>
>> ========================================================================
>>
>> ffmpeg -i image.mpg
>> FFmpeg version git-31ff9bd, Copyright (c) 2000-2011 the FFmpeg developers
>>     built on Mar 12 2011 11:21:15 with gcc 4.1.2
>>     configuration:
>>     libavutil    50. 39. 0 / 50. 39. 0
>>     libavcodec   52.113. 2 / 52.113. 2
>>     libavformat  52.102. 0 / 52.102. 0
>>     libavdevice  52.  2. 3 / 52.  2. 3
>>     libavfilter   1. 76. 0 /  1. 76. 0
>>     libswscale    0. 12. 0 /  0. 12. 0
>> [NULL @ 0x8b8f600] Format detected only with low score of 1, misdetection possible!
>> [mp3 @ 0x8b91ea0] Header missing
>> Last message repeated 1 times
>> Last message repeated 2 times
>> Last message repeated 3 times
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>> Last message repeated 32 times
>> Last message repeated 33 times
>> Last message repeated 34 times
>> Last message repeated 35 times
>> Last message repeated 35 times
>>
>> [mp3 @ 0x8b8f600] Estimating duration from bitrate, this may be inaccurate
>> Input #0, mp3, from 'image.mpg':
>> Duration: N/A, start: 0.000000, bitrate: N/A
>> Stream #0.0: Audio: mp1, 0 channels, s16
>> At least one output file must be specified
>>
>
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