[FFmpeg-user] ffmpeg reported fps different than actual file's
tasos
tasoss at trigonongroup.com
Thu Aug 3 01:09:08 EEST 2017
Hello again.
A lot of information and i'm trying to process them.
I know a few basic things about video processing in general.
Anyway,the specific dvb source channel is quite strange or at least this
is how it looks
to me.
> Is this the ffprobe output from the file or your DVB capture device? I
> politely request you provide full command lines and output in the future.
That was from the file.
> Can you dump directly from the device to file without using ffmpeg? I.E.:
Yes i can.
> ffprobe -v error -select_streams v:0 -show_entries \
> stream=r_frame_rate,avg_frame_rate -of default=nw=1 ./foo.ts
>
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] SPS unavailable in decode_picture_timing
> [h264 @ 0x4088420] non-existing PPS 0 referenced
> [h264 @ 0x4088420] decode_slice_header error
> [h264 @ 0x4088420] no frame!
> [h264 @ 0x4088420] mmco: unref short failure
> r_frame_rate=25/1repeated 1 times
> avg_frame_rate=25/1
> r_frame_rate=25/1
> avg_frame_rate=25/1
Vlc reports 25fps! And btw the video is interlaced.
The fact that i used avi doesn't matter.I mean i could use something else.
Do you recommend mkv ?
Moreover,is the above raw output from the device the best way to be sure
about the fps etc ?
Thanks for the long reply and the time you spent on this. Of course
i have understood a few things better but i should read it again a few
more times
in order to completely get it :)
This whole thing about fps started when i had audio delay problems.
The problem appeared only when i was using -c:v h264_cuvid .
And then,i somehow thought about fps and audio.
But i should post another question about the audio delay problem...
On 8/3/2017 12:31 AM, James Girotti wrote:
> On Tue, Aug 1, 2017 at 3:22 PM, tasos <tasoss at trigonongroup.com> wrote:
>
>> Hello and thanks for replying.
>> This is what ffprobe gives me(i should have mentioned it earlier)
>>
>> Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv,
>>> bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 5593 kb/s, 50 fps, 25 tbr,
>>> 50 tbn, 50 tbc
>>>
>>
> Is this the ffprobe output from the file or your DVB capture device? I
> politely request you provide full command lines and output in the future.
>
>
>> On 8/2/2017 1:01 AM, Simon Brown wrote:
>>
>>> On 1 August 2017 at 22:59, tasos <tasoss at trigonongroup.com> wrote:
>>>
>>> Hello.
>>>> I get a video file with
>>>>
>>>> ffmpeg -y -i /dev/dvb/adapter0/dvr0 -c:v copy -c:a copy foo.avi
>>>> This file is displayed on vlc as a 50fps video file.
>>>>
>>>> Input #0, mpegts, from '/dev/dvb/adapter0/dvr0':
>>>>
>>>>> Duration: N/A, start: 7972.129344, bitrate: N/A
>>>>> Program 1
>>>>> Stream #0:0[0x6e]: Video: h264 (High) ([27][0][0][0] / 0x001B),
>>>>> yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25
>>>>> tbr, 90k tbn, 50 tbc
>>>>> Stream #0:1[0x78]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
>>>>> stereo, s16p, 128 kb/s
>>>>> Stream #0:2[0x82]: Audio: mp3 ([3][0][0][0] / 0x0003), 0 channels,
>>>>> s16p
>>>>
> Can you dump directly from the device to file without using ffmpeg? I.E.:
>
> dd if=/dev/dvb/adapter0/dvr0 of=./foo.ts bs=1M count=100
>
> Then analyze that file with ffprobe and VLC to see what the reported
> frame-rate is.
>
> If you can't dump directly from the device node to file, then try keeping
> the same container/format (I add "-t 30" so that we only get 30 seconds of
> video):
>
> ffmpeg -i /dev/dvb/adapter0/dvr0 -t 30 -c copy -f mpegts ./foo.ts
>
> Example FFPROBE output from a random interlaced video on my computer:
>
> ffprobe -v error -select_streams v:0 -show_entries
> stream=r_frame_rate,avg_frame_rate -of default=nw=1 ./JG-FOO.ts
>
> r_frame_rate=60000/1001
> avg_frame_rate=30000/1001
>
> VLC reports a frame-rate of 30000/1001 for JG-FOO.ts
>
>
>>>> My guess is that VLC is misreporting it, and it's 50 fields per second,
>>>>
>>> interlaced, and so FFMpeg is reporting it as 25 frames per second
>>> correctly.
>>>
> Let's do an experiment; my hypothesis is that when it is muxed to AVI the
> frame-rate is changed for some reason. Are half-frames/fields counted as
> full-fields/frames???
>
> Take JG-FOO.ts from above and mux to AVI:
>
> ffmpeg -v info -ss 5:00 -i ./JG-FOO.ts -c copy -t 10 ./JG-FOO.avi
> Input #0, mpegts, from 'JG-FOO.ts':
> Duration: 01:05:01.45, start: 1.400000, bitrate: 16261 kb/s
> Program 1
> Metadata:
> service_name : Service01
> service_provider: FFmpeg
> Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions,
> 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
> Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
> 5.1(side), fltp, 384 kb/s
> Output #0, avi, to './JG-FOO.avi':
> Metadata:
> ISFT : Lavf57.56.101
> Stream #0:0: Video: mpeg2video (Main) (mpg2 / 0x3267706D), yuv420p(tv,
> top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 59.94 tbr,
> 59.94 tbn, 59.94 tbc
> Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), 384
> kb/s
> Stream mapping:
> Stream #0:0 -> #0:0 (copy)
> Stream #0:1 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> [avi @ 0xbf2690] Non-monotonous DTS in output stream 0:0; previous: 127,
> current: 127; changing to 128. This may result in incorrect timestamps in
> the output file.
> [avi @ 0xbf2690] Non-monotonous DTS in output stream 0:0; previous: 277,
> current: 277; changing to 278. This may result in incorrect timestamps in
> the output file.
> [avi @ 0xbf2690] Non-monotonous DTS in output stream 0:0; previous: 427,
> current: 427; changing to 428. This may result in incorrect timestamps in
> the output file.
> frame= 242 fps=0.0 q=-1.0 Lsize= 7660kB time=00:00:10.01
> bitrate=6268.5kbits/s speed= 406x
> video:7154kB audio:481kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.316611%
>
> Now take a look at the frame-rates:
>
> ffprobe -v error -select_streams v:0 -show_entries
> stream=r_frame_rate,avg_frame_rate -of default=nw=1 ./JG-FOO.avi
>
> r_frame_rate=60000/1001
> avg_frame_rate=60000/1001
>
> So my results show the frame rates have been doubled. Also, it shows
> 60000/1001 FPS using VLC. I think that's basically what you're seeing also
>
> Try setting rate:
>
> ffmpeg -v info -ss 5:00 -i ./JG-FOO.ts -c copy -t 10 -r 30000/1001
> ./JG-FOO-r30.avi
> Input #0, mpegts, from 'JG-FOO.ts':
> Duration: 01:05:01.45, start: 1.400000, bitrate: 16261 kb/s
> Program 1
> Metadata:
> service_name : Service01
> service_provider: FFmpeg
> Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions,
> 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
> Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
> 5.1(side), fltp, 384 kb/s
> Output #0, avi, to './JG-FOO-r30.avi':
> Metadata:
> ISFT : Lavf57.56.101
> Stream #0:0: Video: mpeg2video (Main) (mpg2 / 0x3267706D), yuv420p(tv,
> top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 59.94 tbr,
> 29.97 tbn, 29.97 tbc
> Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), 384
> kb/s
> Stream mapping:
> Stream #0:0 -> #0:0 (copy)
> Stream #0:1 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> [avi @ 0x17986a0] Non-monotonous DTS in output stream 0:0; previous: 64,
> current: 64; changing to 65. This may result in incorrect timestamps in the
> output file.
> [avi @ 0x17986a0] Non-monotonous DTS in output stream 0:0; previous: 139,
> current: 139; changing to 140. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x17986a0] Non-monotonous DTS in output stream 0:0; previous: 214,
> current: 214; changing to 215. This may result in incorrect timestamps in
> the output file.
> frame= 242 fps=0.0 q=-1.0 Lsize= 7653kB time=00:00:10.04
> bitrate=6241.9kbits/s speed= 401x
> video:7154kB audio:481kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.222683%
>
> And FFPROBE outputs:
>
> ffprobe -v error -select_streams v:0 -show_entries
> stream=r_frame_rate,avg_frame_rate -of default=nw=1 ./JG-FOO-r30.avi
>
> r_frame_rate=30000/1001
> avg_frame_rate=30000/1001
>
>
> Using VLC JG-FOO-r30.avi has a frame-rate of 30000/1001. Interestingly, it
> appears that both JG-FOO.avi and JG-FOO-r30.avi play at the same real-time
> rate in VLC. Need to try a longer sample to really tell, but duration is
> listed in VLC as 10 seconds for both.
>
> Seems like there is a 4-year-old bug report about this:
> https://trac.ffmpeg.org/ticket/2900
>
> Next, I try muxing to Matroska (MKV). TLDR: both frame-rates are 30000/1001
> WITHOUT specifying "-r 30000/1001". So MKV does not show the same behavior.
>
> AVI is old (1992!) and MKV might not be universally supported (yet), maybe
> MP4 would work. TLDR (not specifying rate):
>
> ffprobe -v error -select_streams v:0 -show_entries
> stream=r_frame_rate,avg_frame_rate -of default=nw=1 ./JG-FOO.mp4
>
> r_frame_rate=60000/1001
> avg_frame_rate=21780000/890389
>
> Not sure what's going on with the frame-rate here, could the video be mixed
> interlace/non-interlaced? Again, I'm not an expert on container/formats.
> Let's look a little closer still:
>
> for f in JG-FOO*; do echo $f; ffprobe -v error -select_streams v:0
> -show_entries stream=time_base,codec_time_base,r_frame_rate,avg_frame_rate
> -of default=nw=1 $f; done
>
> JG-FOO.avi
> codec_time_base=1001/60000
> r_frame_rate=60000/1001
> avg_frame_rate=60000/1001
> time_base=1001/60000
>
> JG-FOO.mkv
> codec_time_base=1001/30000
> r_frame_rate=30000/1001
> avg_frame_rate=30000/1001
> time_base=1/1000
>
> JG-FOO.mp4
> codec_time_base=890389/21780000
> r_frame_rate=60000/1001
> avg_frame_rate=21780000/890389
> time_base=1/90000
>
> JG-FOO-r30.avi
> codec_time_base=1001/30000
> r_frame_rate=30000/1001
> avg_frame_rate=30000/1001
> time_base=1001/30000
>
> JG-FOO.ts
> codec_time_base=1001/30000
> r_frame_rate=60000/1001
> avg_frame_rate=30000/1001
> time_base=1/90000
>
> It appears that JG-FOO.avi is 60000/1001 frames-per-second, but the time
> base/codec time base is 1001/60000. Frame rate was doubled, but time base
> was halved. So it all works out in the end! That's probably why they all
> play the same speed in VLC as well.
>
> If I can try to decode the relevant part of your ffprobe output "50 fps, 25
> tbr, 50 tbn, 50 tbc":
>
> 50 frames per second
> 25 time base r(?)
> 50 time base n("time base")
> 50 time base c(odec time base)
>
> It looks to me like you have the same situation. The frame-rate is doubled,
> but you time base is halved. Could you run:
>
> ffprobe -v error -select_streams v:0 -show_entries
> stream=time_base,codec_time_base,r_frame_rate,avg_frame_rate -of
> default=nw=1 ./foo.avi
>
> Sorry for the long reply it ended up being written as I was doing it, but I
> hope that helps you understand better what's happening! I've learned a lot
> about ffprobe while doing this (so you helped me too!)
>
> Best Regards,
> -JG
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