To build a mpeg with Tk and mpeg2encode follow this:Records each frame in a directory in ppm image format. You must use a common basename (video here) followed by _XXXX.ppm where XXXX is the frame number. All frames must have the same size (320x200 pixels here). Example:tkimagename write video_0001.ppm -format ppmAs we will use 24 frames per second, you'll need to record a lot of ppm. Once all your frames are recorded, write a video.par_mpg in the same directory with this content:
MPEG-1 stream 24 frames/sec
/path/to/video_%04d /* name of source files */
- /* name of reconstructed images ("-": don't store) */
- /* name of intra quant matrix file ("-": default matrix) */
- /* name of non intra quant matrix file ("-": default matrix) */
- /* name of statistics file ("-": stdout ) */
2 /* input picture file format: 0=*.Y,*.U,*.V, 1=*.yuv, 2=*.ppm */
406 /* number of frames */
1 /* number of first frame */
00:00:00:00 /* timecode of first frame */
12 /* N (# of frames in GOP) */
3 /* M (I/P frame distance) */
1 /* ISO/IEC 11172-2 stream */
0 /* 0:frame pictures, 1:field pictures */
320 /* horizontal_size */
200 /* vertical_size */
2 /* aspect_ratio_information 1=square pel, 2=4:3, 3=16:9, 4=2.11:1 */
2 /* frame_rate_code 1=23.976, 2=24, 3=25, 4=29.97, 5=30 frames/sec. */
3000000.0 /* bit_rate (bits/s) */
112 /* vbv_buffer_size (in multiples of 16 kbit) */
0 /* low_delay */
0 /* constrained_parameters_flag */
4 /* Profile ID: Simple = 5, Main = 4, SNR = 3, Spatial = 2, High = 1 */
8 /* Level ID: Low = 10, Main = 8, High 1440 = 6, High = 4 */
0 /* progressive_sequence */
1 /* chroma_format: 1=4:2:0, 2=4:2:2, 3=4:4:4 */
1 /* video_format: 0=comp., 1=PAL, 2=NTSC, 3=SECAM, 4=MAC, 5=unspec. */
5 /* color_primaries */
5 /* transfer_characteristics */
5 /* matrix_coefficients */
320 /* display_horizontal_size */
200 /* display_vertical_size */
0 /* intra_dc_precision (0: 8 bit, 1: 9 bit, 2: 10 bit, 3: 11 bit */
1 /* top_field_first */
0 0 0 /* frame_pred_frame_dct (I P B) */
0 0 0 /* concealment_motion_vectors (I P B) */
1 1 1 /* q_scale_type (I P B) */
1 0 0 /* intra_vlc_format (I P B)*/
0 0 0 /* alternate_scan (I P B) */
0 /* repeat_first_field */
0 /* progressive_frame */
0 /* P distance between complete intra slice refresh */
0 /* rate control: r (reaction parameter) */
0 /* rate control: avg_act (initial average activity) */
0 /* rate control: Xi (initial I frame global complexity measure) */
0 /* rate control: Xp (initial P frame global complexity measure) */
0 /* rate control: Xb (initial B frame global complexity measure) */
0 /* rate control: d0i (initial I frame virtual buffer fullness) */
0 /* rate control: d0p (initial P frame virtual buffer fullness) */
0 /* rate control: d0b (initial B frame virtual buffer fullness) */
2 2 11 11 /* P: forw_hor_f_code forw_vert_f_code search_width/height */
1 1 3 3 /* B1: forw_hor_f_code forw_vert_f_code search_width/height */
1 1 7 7 /* B1: back_hor_f_code back_vert_f_code search_width/height */
1 1 7 7 /* B2: forw_hor_f_code forw_vert_f_code search_width/height */
1 1 3 3 /* B2: back_hor_f_code back_vert_f_code search_width/height */Finally, run mpeg2encode:exec mpeg2encode /path/to/video.par_mpg /path/to/video.mpg puts "mpeg2encode done."
AM With TclMagick I have been able to automate even more of this (I do not need to define a parameters file like the above - thereby I lose some control - but still).Here is the script I used:
#
# Small script to make an MPEG file
#
package require TclMagick
#
# Get a list of suitable GIF files - all of them living in the current directory
#
set gifs [glob anim*.gif]
#
# Now create the magic wand that will do all the processing
#
set mw [magick create wand]
foreach f $gifs {
$mw read $f
$mw next
}
#
# Make an MPEG file
#
$mw WriteImages justatest.mpg yes
#
# Or if this suits you better, an animated GIF
#
#$mw WriteImages justatest.gif yesSee tk3play which is (or was...) a MPEG audio player.
