OK, so this comes up every so often - I found similar refs on list archives A useful keyword seems to be WSS "wide screen switching" from the old analogue days https://en.wikipedia.org/wiki/Widescreen_signaling
http://ffmpeg-users.933282.n4.nabble.com/Aspect-ratio-td3255527.html http://ffmpeg-users.933282.n4.nabble.com/template/NamlServlet.jtp?macro=search_page&node=933282&query=wss https://www.mail-archive.com/[email protected]&q=subject:%22%5C%5Bissue2255%5C%5D+ffmpeg+h264+wss%22&o=newest&f=1 I'm surprised it's not in the tree - it's an obvious requirement (and ffmpeg's native MP4 encoder does it out of the box...) I'd like to make a feature request - it seems a lot of the work is already done - how to do? Thanks On 25/05/2016 14:33, chronek wrote: > I doubt that it reach any release, but you can build own ffmpeg with > their patch proposed > > W dniu 2016-05-25 o 15:04, Richard F pisze: >> Yes - that's the exact issue - multiple aspect ratio changes, and I'm >> not sure how to find where they occur without a lot of complexity >> About 7 years ago Jarmo Torvinen proposed something to address this >> exact issue - did this ever reach the build, if so how to activate ? >> http://x264-devel.videolan.narkive.com/TlgcMaKZ/reconfiguring-x264-aspect-ratio-in-the-middle-of-stream >> >> >> >> On 25/05/2016 13:53, chronek wrote: >>> Didnt read to end before, are you have 2 aspect ratio in stream? Then >>> you need split and process each part alone... >>> >>> W dniu 2016-05-25 o 11:18, Richard F pisze: >>>> Thanks for your reply, >>>> >>>> The stream info for this file is as follows. As you can see the DAR >>>> starts as 16:9, but the aspect changes several times during the >>>> recording, x264 doesn't follow the changes, stays at 16:9. >>>> >>>> If I force the SAR as you suggest the output is narrower than 4:3 and >>>> still doesn't change with incoming aspect changes. >>>> >>>> Input #0, mpegts, from '00001.ts': >>>> Duration: 00:59:49.47, start: 4529.649200, bitrate: 1477 kb/s >>>> Program 132 >>>> Stream #0:0[0x18a1]: Video: mpeg2video (Main) ([2][0][0][0] / >>>> 0x0002), yuv420p(tv), 544x576 [SAR 32:17 DAR 16:9], max. 15000 >>>> kb/s, 25 >>>> fps, 25 tbr, 90k tbn, 50 tbc >>>> Stream #0:1[0x18a2](eng): Audio: mp2 ([3][0][0][0] / 0x0003), >>>> 48000 >>>> Hz, stereo, s16p, 128 kb/s >>>> Stream #0:2[0x18a3](eng): Audio: mp3 ([3][0][0][0] / 0x0003), 0 >>>> channels, s16p >>>> Stream #0:3[0x18a6](eng): Subtitle: dvb_subtitle ([6][0][0][0] / >>>> 0x0006) >>>> >>>> If I analyse the stream 5 minutes into the programme, like so: >>>> ffmpeg -loglevel quiet -ss 00:05:00 -i "00001.ts" -t 10 -c copy >>>> -avoid_negative_ts 1 -f nut pipe:1 | ffmpeg -hide_banner -i pipe:0 >>>> >>>> Then the video stream is as follows: >>>> >>>> Stream #0:0: Video: mpeg2video (Main) (mpg2 / 0x3267706D), >>>> yuv420p(tv), >>>> 544x576 [SAR 24:17 DAR 4:3], max. 15000 kb/s, SAR 32:17 DAR 16:9, 25 >>>> fps, 25 tbr, 90k tbn, 50 tbc >>>> >>>> So it is meant to show as 4:3 here. >>>> I'm assuming the 2 sets of SAR/DAR are for container and stream >>>> which is >>>> why it still shows as 16:9 after ffmpeg processing ? >>>> >>>> >>>> >>>> On 25/05/2016 08:10, chronek wrote: >>>>> Maybe your source not have sar 1:1... setdar will not change >>>>> resolution, it will change only information about aspectratio and >>>>> some >>>>> players not read desired aspect ratio... Best try change to >>>>> resolution >>>>> what yuou want and setsar for it... ( -vf scale=x:y,setsar=1 ) >>>>> >>>>> W dniu 2016-05-25 o 09:00, Richard F pisze: >>>>>> Hi list, >>>>>> >>>>>> I have a number of MPEG2 TS DVB recordings that have aspect ratio >>>>>> changes - e.g. older films or 4:3 programmes that have 16:9 >>>>>> continuity, trailers, adverts etc. >>>>>> >>>>>> I want to transcode to H264 using ffmpeg (3.02), but the output >>>>>> aspect ratio does not follow the source when using the H264 codec. >>>>>> But the aspect ratio does follow when using the xvid/mp4 codec. >>>>>> I need x264 not mp4. >>>>>> The problem is that (I think) the container DAR or SAR stays at 16:9 >>>>>> all the way through but the stream SAR or DAR doesn't follow the >>>>>> source for whatever reason >>>>>> >>>>>> Is there a way to make x264 output follow the source aspect ratio at >>>>>> the stream level ? >>>>>> >>>>>> Failing example : >>>>>> ffmpeg -y -i 00001.ts -map 0:0 -map 0:1 -map 0:3 -c:v libx264 >>>>>> -preset >>>>>> veryfast -profile:v high -level 4.0 -crf 20 -flags +loop -flags >>>>>> +ilme >>>>>> -vf yadif=0:-1:0 -c:a:0 aac -b:a:0 128k -c:s copy -f mpegts >>>>>> file-1.ts >>>>>> (same if I take out the profile and deinterlace settings) >>>>>> >>>>>> Working example (but large file and not so good quality, even if I >>>>>> could use it): >>>>>> ffmpeg -y -i 00001.ts -map 0:0 -map 0:1 -map 0:3 -c:v libxvid -q:v 3 >>>>>> -c:a:0 aac -b:a:0 128k -c:s copy -f mpegts file-1.ts >>>>>> >>>>>> If I add -vf setdar=dar=4/3, I can force the x264 version to be 4/3 >>>>>> but then all parts of the recording are always 4/3 which is also >>>>>> wrong. >>>>>> >>>>>> Behaviour is the same on VLC player, ffplay, and Kodi. >>>>>> >>>>>> Appreciate any pointers >>>>>> Thanks >>>>>> Richard >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> ffmpeg-user mailing list >>>>>> [email protected] >>>>>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >>>>>> >>>>>> To unsubscribe, visit link above, or email >>>>>> [email protected] with subject "unsubscribe". >>>>> _______________________________________________ >>>>> ffmpeg-user mailing list >>>>> [email protected] >>>>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >>>>> >>>>> To unsubscribe, visit link above, or email >>>>> [email protected] with subject "unsubscribe". >>>> _______________________________________________ >>>> ffmpeg-user mailing list >>>> [email protected] >>>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >>>> >>>> To unsubscribe, visit link above, or email >>>> [email protected] with subject "unsubscribe". >>> _______________________________________________ >>> ffmpeg-user mailing list >>> [email protected] >>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >>> >>> To unsubscribe, visit link above, or email >>> [email protected] with subject "unsubscribe". >> >> _______________________________________________ >> ffmpeg-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >> >> To unsubscribe, visit link above, or email >> [email protected] with subject "unsubscribe". > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
