[FFmpeg-user] Converted DVDs in .mkv format lose Pause, FastForward, Skip, etc functions when I restream as mpeg to DLNA

[jen142 at promessage.com]

Continuing to try to remove variables from the situation, I'm now using
only ffmpeg/ffplay for streaming & playback.  I'm hoping someone who
knows more about this can actually help with interpreting or more
suggestions.

Since ffplay has such rudimentary motion controls -- L/R/PgUp/PgDwn --
compared to VLC or the standalone BluRay player, I'm not sure if what
follows actually tells me anything useful.

If I play the native file

	ffplay -i movie.mkv

it plays without error.

If I play the transcoded stream

	ffmpeg -i movie.mkv -f mpegts -b:v 2500k -minrate 2500k -maxrate
	2800k -r 29.97 -g 300 -bf 2 -bsf:v h264_mp4toannexb -vcodec
	mpeg2video -acodec copy - | ffplay -

it also plays without error.

In case it's useful, the output at the console in the transcoded test is


	ffmpeg -i movie.mkv -f mpegts -b:v 2500k -minrate 2500k -maxrate
	2500k -r 29.97 -g 300 -bf 2 -bsf:v h264_mp4toannexb -threads 2
	-vcodec mpeg2video -acodec copy - | ffplay -
	ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg
	developers
	...
	ffplay version 2.0.1 Copyright (c) 2003-2013 the FFmpeg
	developers
	...
	Input #0, matroska,webm, from 'movie.mkv':
	  Duration: 01:32:11.25, start: 0.000000, bitrate: 1820 kb/s
	    Chapter #0.0: start 0.000000, end 250.124867
	    Metadata:
	      title           : Chapter 1
	    ...
	    Chapter #0.27: start 6099.134700, end 6373.450500
	    Metadata:
	      title           : Chapter 28
	    Stream #0:0(eng): Video: h264 (High), yuv420p, 720x358 [SAR
	    32:27 DAR 1280:537], SAR 186:157 DAR 66960:28103, 23.98 fps,
	    23.98 tbr, 1k tbn, 47.95 tbc (default)
	    Stream #0:1(eng): Audio: aac, 48000 Hz, stereo, fltp
	    (default)
	    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448
	    kb/s
	[mpeg2video @ 0x21275e0] Automatically choosing VBV buffer size
	of 224 kbyte
	Output #0, mpegts, to 'pipe:':
	  Metadata:
	    encoder         : Lavf55.12.100
	    Chapter #0.0: start 0.000000, end 250.124867
	    Metadata:
	      title           : Chapter 1
	    ...
	    Chapter #0.27: start 6099.134700, end 6373.450500
	    Metadata:
	      title           : Chapter 28
	    Stream #0:0(eng): Video: mpeg2video, yuv420p, 720x358 [SAR
	    186:157 DAR 66960:28103], q=2-31, 2500 kb/s, 90k tbn, 29.97
	    tbc (default)
	    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), 448 kb/s
	Stream mapping:
	  Stream #0:0 -> #0:0 (h264 -> mpeg2video)
	  Stream #0:2 -> #0:1 (copy)
	Press [q] to stop, [?] for help
	Input #0, mpegts, from 'pipe:':    0KB vq=    0KB sq=    0B
	f=0/0   
	  Duration: N/A, start: 1.433367, bitrate: 448 kb/s
	  Program 1 
	    Metadata:
	      service_name    : Service01
	      service_provider: FFmpeg
	    Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] /
	    0x0002), yuv420p, 720x358 [SAR 39559:36000 DAR 221:100],
	    29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
	    Stream #0:1[0x101](eng): Audio: ac3 ([129][0][0][0] /
	    0x0081), 48000 Hz, 5.1(side), fltp, 448 kb/s
	   ...


In BOTH cases, the L/R/PgUp/PgDown controls allow chapter skips/reverse.
 But even though they seem to work, occassional -- not every -- presses
result in these messages at the console

	...
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	File is broken, keyframes not correctly marked!KB sq=    0B
	f=0/0   
	...

Does the fact that the controls work at all necessarily mean that the
problem of non-functioning action controls MUST be caused by the DLNA
server?  Seems odd as the server only pipes the input/output through the
ffmpeg command.

Or, do the "File is broken" messages indicate that there IS a problem in
the stream itself or with the transcoding by ffmpeg?