Re: [FFmpeg-user] ffmpeg architecture question #2
Am Sa., 25. Apr. 2020 um 04:20 Uhr schrieb Mark Filipak : > > On 04/24/2020 01:22 PM, Carl Eugen Hoyos wrote: > > > > > >> Am 24.04.2020 um 11:10 schrieb Mark Filipak > >> : > >> > >> I've been told that, for soft telecined video the decoder is fully > >> compliant > >> and therefore outputs 30fps > > > > (“fps” is highly ambiguous in this sentence.) The decoder is "compliant" in the sense that the stream it outputs for soft-telecined input has a time base of 3/1001, the output has 24000/1001 "frames per second" though. > > This is not correct. > > I believe I told you some time ago that this is not how the decoder behaves. > > I beg your pardon, Carl Eugen. I thought you said that the decoders are > fully compliant and therefore produce interlaced fields. I am quite sure I wrote the opposite several times as replies to your mails. Note that FFmpeg cannot produce "fields" because it cannot deal with devices that know what a "field" is. (Just as there are "interlacing" filters that you would call differently if it were your decision, we also decided to name some of the filters that deal with frames "field"-filters because this allows understanding the filters' purpose for everybody except broadcast and video engineers like you.) > > I believe such a behaviour would not make sense for FFmpeg (because > > you cannot connect FFmpeg’s output to an NTSC CRT). The telecine filter > > would not work at all if above were the case. > > Or in other words: FFmpeg outputs approximately 24 frames per second for > > typical soft-telecined program streams. > > The only thing FFmpeg does to be “compliant” is to forward the correct time > > base. > > By "correct time base" you mean 24/1.001, correct? lol, no Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Sorry, the p24 "source" *is* soft telecine. On 04/24/2020 11:06 PM, pdr0 wrote: Mark Filipak wrote If you take a soft telecine input, encode it directly to rawvideo or lossless output, you can confirm this. The output is 29.97 (interlaced content) . When I do 'telecine=pattern=5', I wind up with this |<--1/6s-->| [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine I have confirmed it by single-frame stepping through test videos. No. The above timing is for an MKV of the 55-telecine transcode, not for the decoder's output. That's telecine=pattern=5 on a 23.976p native progressive source I thought this thread was about using a soft telecine source , and how ffmpeg handles that because you were making assumptions "So, if the 'i30, TFF' from the decoder is correct, the following must be the full picture: " Obviously i30 does not refer to a 23.976p native progressive source... Pattern looks correct, but unless you are doing something differently , your timescale is not correct When input is vob, mpeg2-ps or mpeg-es using soft telecine in my test, using telecine=pattern=5 the output frame rate is 74.925 as expected (2.5 * 29.97 = 74.925). Not for me. I've seen 74.925 FPS just one time. Since I considered it a failure, I didn't save the video and its log, so I don't know how I got it. This mean RF flags are used, 29.97i output from decoder. Since its 74.925fps, the scale in your diagram for 1/6s is wrong for telecine=pattern=5 For this command line: ffmpeg -report -i "1.018.m2ts" -filter_complex "telecine=pattern=5,split=5[A][B][C][D][E],[A]select='eq(mod(n+1\,5)\,1)'[F],[B]select='eq(mod(n+1\,5)\,2)'[G],[C]select='eq(mod(n+1\,5)\,3)'[H],[D]select='eq(mod(n+1\,5)\,4)'[I],[E]select='eq(mod(n+1\,5)\,0)'[J],[F][G][H][I][J]interleave=nb_inputs=5" -map 0 -c:v libx264 -crf 20 -codec:a copy -codec:s copy "C:\AVOut\1.018.4.MKV" MPV playback of '1.018.4.MKV' says "FPS: 59.940 (estimated)" (not 74.925fps). Is that m2ts a soft telecine BD's ? This thread was about soft telecine... I see your misunderstanding. Here's my original diagram: |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine [A/-_][-/a_][B/-_][-/b_][B/-_][-/c_][C/-_][-/d_][D/-_][-/d_] i30-TFF [A/a___][B/b___][B/c___][C/d___][D/d___] deinterlace [A/a__][B/b__][C/c__][D/d__] detelecine [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine So, you see, the source is p24. "i30-TFF" is what I thought came out of the decoder -- that is based on the latest info (and it is what took me by surprise as I'd always thought that ffmpeg decoders always output frames). Soft telecine is nowhere in that diagram. Sorry for the confusion. CORRECTION: The p24 "source" *is* soft telecine. I'm working on BDs and DVDs in parallel and momentarily got my wires crossed. Of course, it is soft telecined. Otherwise, i30-TFF wouldn't be there at all. The p24 source would go directly to 55-telecine. Most film BD's are native progressive 23.976 Yes, that is the "source" in the diagram. Both ffplay and mpv look like they ignore the repeat field flags, the preview is progressive 23.976p I use MPV. I'm unsure what you mean by "preview". ...and "preview" of what? The decoder output or the MKV output video? The "preview" of the video is what you see when ffplay window opens or mpv opens. It's a RGB converted representation what you are using as input to mpv or ffplay . Oh, I didn't know there was a distinction. I thought it was just the playback. So I'm referring to a soft telecine source, because that's what you were talking about I hope that confusion is resolved. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
On 04/24/2020 11:06 PM, pdr0 wrote: Mark Filipak wrote If you take a soft telecine input, encode it directly to rawvideo or lossless output, you can confirm this. The output is 29.97 (interlaced content) . When I do 'telecine=pattern=5', I wind up with this |<--1/6s-->| [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine I have confirmed it by single-frame stepping through test videos. No. The above timing is for an MKV of the 55-telecine transcode, not for the decoder's output. That's telecine=pattern=5 on a 23.976p native progressive source I thought this thread was about using a soft telecine source , and how ffmpeg handles that because you were making assumptions "So, if the 'i30, TFF' from the decoder is correct, the following must be the full picture: " Obviously i30 does not refer to a 23.976p native progressive source... Pattern looks correct, but unless you are doing something differently , your timescale is not correct When input is vob, mpeg2-ps or mpeg-es using soft telecine in my test, using telecine=pattern=5 the output frame rate is 74.925 as expected (2.5 * 29.97 = 74.925). Not for me. I've seen 74.925 FPS just one time. Since I considered it a failure, I didn't save the video and its log, so I don't know how I got it. This mean RF flags are used, 29.97i output from decoder. Since its 74.925fps, the scale in your diagram for 1/6s is wrong for telecine=pattern=5 For this command line: ffmpeg -report -i "1.018.m2ts" -filter_complex "telecine=pattern=5,split=5[A][B][C][D][E],[A]select='eq(mod(n+1\,5)\,1)'[F],[B]select='eq(mod(n+1\,5)\,2)'[G],[C]select='eq(mod(n+1\,5)\,3)'[H],[D]select='eq(mod(n+1\,5)\,4)'[I],[E]select='eq(mod(n+1\,5)\,0)'[J],[F][G][H][I][J]interleave=nb_inputs=5" -map 0 -c:v libx264 -crf 20 -codec:a copy -codec:s copy "C:\AVOut\1.018.4.MKV" MPV playback of '1.018.4.MKV' says "FPS: 59.940 (estimated)" (not 74.925fps). Is that m2ts a soft telecine BD's ? This thread was about soft telecine... I see your misunderstanding. Here's my original diagram: |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine [A/-_][-/a_][B/-_][-/b_][B/-_][-/c_][C/-_][-/d_][D/-_][-/d_] i30-TFF [A/a___][B/b___][B/c___][C/d___][D/d___] deinterlace [A/a__][B/b__][C/c__][D/d__] detelecine [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine So, you see, the source is p24. "i30-TFF" is what I thought came out of the decoder -- that is based on the latest info (and it is what took me by surprise as I'd always thought that ffmpeg decoders always output frames). Soft telecine is nowhere in that diagram. Sorry for the confusion. Most film BD's are native progressive 23.976 Yes, that is the "source" in the diagram. Both ffplay and mpv look like they ignore the repeat field flags, the preview is progressive 23.976p I use MPV. I'm unsure what you mean by "preview". ...and "preview" of what? The decoder output or the MKV output video? The "preview" of the video is what you see when ffplay window opens or mpv opens. It's a RGB converted representation what you are using as input to mpv or ffplay . Oh, I didn't know there was a distinction. I thought it was just the playback. So I'm referring to a soft telecine source, because that's what you were talking about I hope that confusion is resolved. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Mark Filipak wrote > >> >> If you take a soft telecine input, encode it directly to rawvideo or >> lossless output, you can confirm this. >> The output is 29.97 (interlaced content) . >> >>> When I do 'telecine=pattern=5', I wind up with this >>> >>> |<--1/6s-->| >>> [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine >>> >>> I have confirmed it by single-frame stepping through test videos. >> >> No. > > The above timing is for an MKV of the 55-telecine transcode, not for the > decoder's output. That's telecine=pattern=5 on a 23.976p native progressive source I thought this thread was about using a soft telecine source , and how ffmpeg handles that because you were making assumptions "So, if the 'i30, TFF' from the decoder is correct, the following must be the full picture: " Obviously i30 does not refer to a 23.976p native progressive source... >> Pattern looks correct, but unless you are doing something differently , >> your >> timescale is not correct >> >> When input is vob, mpeg2-ps or mpeg-es using soft telecine in my test, >> using >> telecine=pattern=5 the output frame rate is 74.925 as expected (2.5 * >> 29.97 >> = 74.925). > > Not for me. I've seen 74.925 FPS just one time. Since I considered it a > failure, I didn't save the > video and its log, so I don't know how I got it. > >> This mean RF flags are used, 29.97i output from decoder. Since >> its 74.925fps, the scale in your diagram for 1/6s is wrong for >> telecine=pattern=5 > > For this command line: > > ffmpeg -report -i "1.018.m2ts" -filter_complex > "telecine=pattern=5,split=5[A][B][C][D][E],[A]select='eq(mod(n+1\,5)\,1)'[F],[B]select='eq(mod(n+1\,5)\,2)'[G],[C]select='eq(mod(n+1\,5)\,3)'[H],[D]select='eq(mod(n+1\,5)\,4)'[I],[E]select='eq(mod(n+1\,5)\,0)'[J],[F][G][H][I][J]interleave=nb_inputs=5" > > -map 0 -c:v libx264 -crf 20 -codec:a copy -codec:s copy > "C:\AVOut\1.018.4.MKV" > > MPV playback of '1.018.4.MKV' says "FPS: 59.940 (estimated)" (not > 74.925fps). Is that m2ts a soft telecine BD's ? This thread was about soft telecine... Most film BD's are native progressive 23.976 >> Both ffplay and mpv look like they ignore the repeat field flags, the >> preview is progressive 23.976p > > I use MPV. I'm unsure what you mean by "preview". ...and "preview" of > what? The decoder output or > the MKV output video? The "preview" of the video is what you see when ffplay window opens or mpv opens. It's a RGB converted representation what you are using as input to mpv or ffplay . So I'm referring to a soft telecine source, because that's what you were talking about -- Sent from: http://www.ffmpeg-archive.org/ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
On 04/24/2020 01:28 PM, pdr0 wrote: Mark Filipak wrote I've been told that, for soft telecined video the decoder is fully compliant and therefore outputs 30fps I've also been told that the 30fps is interlaced (which I found surprising) Is this correct so far? Yes If you take a soft telecine input, encode it directly to rawvideo or lossless output, you can confirm this. The output is 29.97 (interlaced content) . When I do 'telecine=pattern=5', I wind up with this |<--1/6s-->| [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine I have confirmed it by single-frame stepping through test videos. No. The above timing is for an MKV of the 55-telecine transcode, not for the decoder's output. Pattern looks correct, but unless you are doing something differently , your timescale is not correct When input is vob, mpeg2-ps or mpeg-es using soft telecine in my test, using telecine=pattern=5 the output frame rate is 74.925 as expected (2.5 * 29.97 = 74.925). Not for me. I've seen 74.925 FPS just one time. Since I considered it a failure, I didn't save the video and its log, so I don't know how I got it. This mean RF flags are used, 29.97i output from decoder. Since its 74.925fps, the scale in your diagram for 1/6s is wrong for telecine=pattern=5 For this command line: ffmpeg -report -i "1.018.m2ts" -filter_complex "telecine=pattern=5,split=5[A][B][C][D][E],[A]select='eq(mod(n+1\,5)\,1)'[F],[B]select='eq(mod(n+1\,5)\,2)'[G],[C]select='eq(mod(n+1\,5)\,3)'[H],[D]select='eq(mod(n+1\,5)\,4)'[I],[E]select='eq(mod(n+1\,5)\,0)'[J],[F][G][H][I][J]interleave=nb_inputs=5" -map 0 -c:v libx264 -crf 20 -codec:a copy -codec:s copy "C:\AVOut\1.018.4.MKV" MPV playback of '1.018.4.MKV' says "FPS: 59.940 (estimated)" (not 74.925fps). Both ffplay and mpv look like they ignore the repeat field flags, the preview is progressive 23.976p I use MPV. I'm unsure what you mean by "preview". ...and "preview" of what? The decoder output or the MKV output video? ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
On 04/24/2020 01:22 PM, Carl Eugen Hoyos wrote: Am 24.04.2020 um 11:10 schrieb Mark Filipak : I've been told that, for soft telecined video the decoder is fully compliant and therefore outputs 30fps (“fps” is highly ambiguous in this sentence.) This is not correct. I believe I told you some time ago that this is not how the decoder behaves. I beg your pardon, Carl Eugen. I thought you said that the decoders are fully compliant and therefore produce interlaced fields. I believe such a behaviour would not make sense for FFmpeg (because you cannot connect FFmpeg’s output to an NTSC CRT). The telecine filter would not work at all if above were the case. Or in other words: FFmpeg outputs approximately 24 frames per second for typical soft-telecined program streams. The only thing FFmpeg does to be “compliant” is to forward the correct time base. By "correct time base" you mean 24/1.001, correct? ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
On 04/24/2020 11:30 AM, Edward Park wrote: Hi, I don't know if the decoder outputs 30fps as is from 24fps soft telecine, but if it does, it must include the flags that you need to reconstruct the original 24 format or set it as metadata because frame stepping in ffplay (using the "s" key on the keyboard) goes over 1/24 s progressive frames, even though the stream info says 29.97fps. I've seen the same operation frame-stepping via MPV. That fact, and assertions by the HandBrake folks that (at least from their perspective), the ffmpeg libraries (decoders?) work solely on frames -- at least, that's my interpretation of what they said. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Carl Eugen Hoyos-2 wrote >> e.g >> ffmpeg -i input.mpeg -c:v rawvideo -an output.yuv > > (Consider to test with other output formats.) What did you have in mind? e.g. ffmpeg -i input.mpeg -c:v utvideo -an output.avi The output is 29.97, according to ffmpeg and double check using official utvideo VFW decoder, duplicate frames . Missing 3 frames if duplicates abide by RF flags e.g. ffmpeg -i input.mpeg -c:v utvideo -an output.mkv Output is 29.97, but no duplicate frames. Missing 1 frame eg. ffmpeg -i input.mpeg -c:v libx264 -crf 18 -an output.mp4 Output is 29.97 with duplicates . Elementary stream analysis confirms finding. But missing 3 frames if duplicates abide by RF flags ffmpeg -i input.mpeg -c:v libx264 -crf 18 -an output.mkv Output is 23.976 no duplicates . Missing 1 frame eg. ffmpeg -i input.mpeg -c:v ffv1 -an output_ffv1.mkv Output is 29.97, no duplicates. Missing 1 frame Looks like some container differences too. -- Sent from: http://www.ffmpeg-archive.org/ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
> Am 24.04.2020 um 19:34 schrieb pdr0 : > > Carl Eugen Hoyos-2 wrote >>> Am 24.04.2020 um 11:10 schrieb Mark Filipak > >> markfilipak.windows+ffmpeg@ > >> : >>> >>> I've been told that, for soft telecined video the decoder is fully >>> compliant and therefore outputs 30fps >> >> (“fps” is highly ambiguous in this sentence.) >> >> This is not correct. >> I believe I told you some time ago that this is not how the decoder >> behaves. I believe such a behaviour would not make sense for FFmpeg >> (because you cannot connect FFmpeg’s output to an NTSC CRT). The telecine >> filter would not work at all if above were the case. >> Or in other words: FFmpeg outputs approximately 24 frames per second for >> typical soft-telecined program streams. >> >> The only thing FFmpeg does to be “compliant” is to forward the correct >> time base. > > > If you use direct encode, no filters, no switches, the output from soft > telecine input video is 29.97p, where every 5th frame is a duplicate No > e.g > ffmpeg -i input.mpeg -c:v rawvideo -an output.yuv (Consider to test with other output formats.) > But you can "force" it to output 23.976p by using -vf fps > > Is this what you mean by "forward the correct time base" ? No. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Hi, > Output is actually 29.97p with 5th frame duplicates . The repeat field flags > are not taken into account. > If you use direct encode, no filters, no switches, the output from soft > telecine input video is 29.97p, where every 5th frame is a duplicate > > e.g > ffmpeg -i input.mpeg -c:v rawvideo -an output.yuv > > But you can "force" it to output 23.976p by using -vf fps > > Is this what you mean by "forward the correct time base" ? I think 5th frame duplicated is only accurate for shorter durations, I think you will see if you look at the timestamps of each frame over a longer period. They advance by 2 60fps 'ticks', 3 ticks, etc as if the duration was determined using rf and tff flags. Regards, Ted Park ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
pdr0 wrote > If you take a soft telecine input, encode it directly to rawvideo or > lossless output, you can confirm this. > The output is 29.97 (interlaced content) . So my earlier post is incorrect Output is actually 29.97p with 5th frame duplicates . The repeat field flags are not taken into account. -- Sent from: http://www.ffmpeg-archive.org/ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Carl Eugen Hoyos-2 wrote >> Am 24.04.2020 um 11:10 schrieb Mark Filipak > markfilipak.windows+ffmpeg@ > : >> >> I've been told that, for soft telecined video the decoder is fully >> compliant and therefore outputs 30fps > > (“fps” is highly ambiguous in this sentence.) > > This is not correct. > I believe I told you some time ago that this is not how the decoder > behaves. I believe such a behaviour would not make sense for FFmpeg > (because you cannot connect FFmpeg’s output to an NTSC CRT). The telecine > filter would not work at all if above were the case. > Or in other words: FFmpeg outputs approximately 24 frames per second for > typical soft-telecined program streams. > > The only thing FFmpeg does to be “compliant” is to forward the correct > time base. If you use direct encode, no filters, no switches, the output from soft telecine input video is 29.97p, where every 5th frame is a duplicate e.g ffmpeg -i input.mpeg -c:v rawvideo -an output.yuv But you can "force" it to output 23.976p by using -vf fps Is this what you mean by "forward the correct time base" ? -- Sent from: http://www.ffmpeg-archive.org/ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Mark Filipak wrote >> I've been told that, for soft telecined video >> the decoder is fully compliant and therefore outputs 30fps >> I've also been told that the 30fps is interlaced (which I found >> surprising) >> Is this correct so far? Yes If you take a soft telecine input, encode it directly to rawvideo or lossless output, you can confirm this. The output is 29.97 (interlaced content) . > When I do 'telecine=pattern=5', I wind up with this > > |<--1/6s-->| > [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine > > I have confirmed it by single-frame stepping through test videos. No. Pattern looks correct, but unless you are doing something differently , your timescale is not correct When input is vob, mpeg2-ps or mpeg-es using soft telecine in my test, using telecine=pattern=5 the output frame rate is 74.925 as expected (2.5 * 29.97 = 74.925). This mean RF flags are used, 29.97i output from decoder. Since its 74.925fps, the scale in your diagram for 1/6s is wrong for telecine=pattern=5 Both ffplay and mpv look like they ignore the repeat field flags, the preview is progressive 23.976p -- Sent from: http://www.ffmpeg-archive.org/ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
> Am 24.04.2020 um 11:10 schrieb Mark Filipak > : > > I've been told that, for soft telecined video the decoder is fully compliant > and therefore outputs 30fps (“fps” is highly ambiguous in this sentence.) This is not correct. I believe I told you some time ago that this is not how the decoder behaves. I believe such a behaviour would not make sense for FFmpeg (because you cannot connect FFmpeg’s output to an NTSC CRT). The telecine filter would not work at all if above were the case. Or in other words: FFmpeg outputs approximately 24 frames per second for typical soft-telecined program streams. The only thing FFmpeg does to be “compliant” is to forward the correct time base. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
Hi, I don't know if the decoder outputs 30fps as is from 24fps soft telecine, but if it does, it must include the flags that you need to reconstruct the original 24 format or set it as metadata because frame stepping in ffplay (using the "s" key on the keyboard) goes over 1/24 s progressive frames, even though the stream info says 29.97fps. Regards, Ted Park ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] ffmpeg architecture question #2
On 04/24/2020 05:10 AM, Mark Filipak wrote: Hello, I've been told that, for soft telecined video |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source the decoder is fully compliant and therefore outputs 30fps |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine I've also been told that the 30fps is interlaced (which I found surprising) |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine [A/-_][-/a_][B/-_][-/b_][B/-_][-/c_][C/-_][-/d_][D/-_][-/d_] i30-TFF Is this correct so far? (No response, so continuing.) When I do 'telecine=pattern=5', I wind up with this |<--1/6s-->| [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine I have confirmed it by single-frame stepping through test videos. So, if the 'i30, TFF' from the decoder is correct, the following must be the full picture: |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine [A/-_][-/a_][B/-_][-/b_][B/-_][-/c_][C/-_][-/d_][D/-_][-/d_] i30, TFF [A/a___][B/b___][B/c___][C/d___][D/d___] deinterlace [A/a__][B/b__][C/c__][D/d__] detelecine [A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] 55-telecine Now, I'm not telling ffmpeg to do the deinterlace or the detelecine. If it indeed is doing deinterlace & detelecine -- I don't know how to get from i30-TFF to 55-telecine any other way -- it must be doing it on its own. Is this correct? ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] ffmpeg architecture question #2
Hello, I've been told that, for soft telecined video |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source the decoder is fully compliant and therefore outputs 30fps |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine I've also been told that the 30fps is interlaced (which I found surprising) |<--1/6s-->| [A/a__][B/b__][C/c__][D/d__] source [A/a___][B/b___][B/c___][C/d___][D/d___] hard telecine [A/-_][-/a_][B/-_][-/b_][B/-_][-/c_][C/-_][-/d_][D/-_][-/d_] i30, TFF Is this correct so far? Thanks, Mark. -- COVID-19 facts: The United States is 4% of world population, 32% of cases, 25% of deaths. The U.S. & S.Korea reported 1st cases on the same day. In March, week 2, S.Korea did 10,000 tests per day, 4 hour results. In March, week 2, The U.S. did 400 tests per day, 7 day results. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
