May 2017 - ffmpeg-user - lists.ffmpeg.org

Transmitting Sliced-I frames with ffmpeg
by Simon Brown 23 May '17

23 May '17

I have an encoder which gives me the option of generating sliced I frames. These frames have a slice of I frame inserted in each frame, but there is never a full I frame. If I use FFMpeg to rebroadcast the stream to an HLS stream, then it works well when I'm not using sliced I frames, but only transmits audio when there are sliced I frames in the incoming stream. Is there any way of persuading it to accept sliced I frames? I know I'm using an old version of ffmpeg, but it's built for an embedded processor, and I've used different options and modified some examples for a different application. The result is that I REALLY don't want to have to rebuild with the latest code, but if someone can assure me that the latest build DOES support sliced I frame I will do that - I don't want to take a gamble though. ~/ffmpeg/ffmpeg -i udp://127.0.0.1:65111 -bsf:v h264_mp4toannexb -hls_time 0.4 -hls_list_size 20 -hls_flags delete_segments+split_by_time -codec copy browser.m3u8 ffmpeg version N-81696-gd38dff8e Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.9.3 (Linaro GCC 4.9-2014.11) 20141031 (prerelease) configuration: --disable-decoders --enable-decoder=h264 --enable-decoder=vc1 --enable-decoder=aac --disable-ffplay --disable-ffprobe --disable-ffserver --enable-neon libavutil 55. 29.100 / 55. 29.100 libavcodec 57. 57.100 / 57. 57.100 libavformat 57. 49.100 / 57. 49.100 libavdevice 57. 0.102 / 57. 0.102 libavfilter 6. 62.100 / 6. 62.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 1.100 / 2. 1.100 [h264 @ 0xbc4a30] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0xbc4a30] decode_slice_header error [h264 @ 0xbc4a30] non-existing PPS 0 referenced [h264 @ 0xbc4a30] decode_slice_header error [h264 @ 0xbc4a30] non-existing PPS 0 referenced [h264 @ 0xbc4a30] decode_slice_header error [h264 @ 0xbc4a30] no frame! [h264 @ 0xbc4a30] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0xbc4a30] decode_slice_header error [h264 @ 0xbc4a30] non-existing PPS 0 referenced [h264 @ 0xbc4a30] decode_slice_header error [h264 @ 0xbc4a30] non-existing PPS 0 referenced [h264 @ 0xbc4a30] decode_slice_header error [h264 @ 0xbc4a30] no frame! Input #0, mpegts, from 'udp://127.0.0.1:65111': Duration: N/A, start: 10874.683144, bitrate: N/A Program 1 Metadata: service_name : PROGRAM 001 service_provider: SVP NETWORK Stream #0:0[0x1100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 90k tbn, 120 tbc Stream #0:1[0x1110]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 109 kb/s [hls @ 0xc2f540] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. Last message repeated 1 times Output #0, hls, to '/home/root/studio_web/myapp/public/images/browser.m3u8': Metadata: encoder : Lavf57.49.100 Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 60 tbr, 90k tbn, 60 tbc Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, 109 kb/s Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (copy) So it clearly sees the H264 stream, but never copies any frames. Cheers, Simon

2 1

Capturing without break
by LaHu 23 May '17

23 May '17

Hi, I'd like to know if there's a way to go on recording even when the source will disappear for a while? Reason: I plan to record several sources at a time as independent recordings. Source A will become Video A, Source B will become Video B and so on. Source A will be the "master" and the duration of its recording is the reference for all other recordings. If Source A lasts 30 minutes then all other sources should last 30 minutes as well, no matter if their sources deliver valid signals or not. It is not really neccessary that the duration of all recordings is exactly the same. If there's a loss of signal and the recording stops then it is fine enough to automatically start a second recording without a signal if the break between ending the first recording and start with the next recording takes not longer than one second. I would use then a script which puts both streams together. Thanks in advance!

2 1

ffplay after 20161003 not support subtitle
by Giannis Micros 23 May '17

23 May '17

Win32 Version: ffmpeg-20161006-0212867-win32-static version and before works with ass subtitle , can show video window. After ffmpeg-20161007-c45ba26-win32-static version , can't show video window . Why?

3 2

How to download streaming video with FFmpeg?
by Mirco Buttari 23 May '17

23 May '17

Hi, traying to download streraming video with http://pasty.link/ it fail and suggest me: "Found streaming video, download it with FFmpeg [1]". I download FFmpeg files but now I need instruction, what can i do now? Please let me know Tnx Mirco Con Open 4 Giga a 9 euro/4 sett navighi veloce, chiami e invii SMS dal tuo smartphone verso tutti i fissi e mobili in Italia. Passa a Tiscali Mobile! http://casa.tiscali.it/mobile/

2 1

why doesn't fast seeking work in live hls
by Louis Letourneau 23 May '17

23 May '17

Just a question before I start diving in the code, why doesn't fast seeking work on live hls feeds/streams/files? Context: If you create a dummy video: mkdir -p a;ffmpeg -y -s 640x480 -f rawvideo -pix_fmt rgb24 -r 25 -i /dev/zero -vf "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMono.ttf: text=%{n}: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x000000FF" -an -vcodec libx264 -preset medium -tune stillimage -crf 24 -pix_fmt yuv420p -shortest -force_key_frames "expr:gte(t,n_forced*5)" -bf 0 -hls_time 5 -hls_list_size 0 -hls_wrap 0 -hls_allow_cache 1 -hls_segment_filename "a/a_%04d.ts" -t 9999 a/a.m3u8 let it encode and in another terminal try to seek (once the encoding passed the time you want to seek to) ffmpeg -v info -ss 00:00:10 -y -live_start_index 0 -i a/a.m3u8 -f image2 -vframes 1 a.png ; feh a.png You'll get in the logs a/a.m3u8: could not seek to position 11.400 and then ffmpeg will decode all frames until the asked frame. If you quit the encoder and seek again, it fast seeks immediately (jumps to the right segment and decodes te right frame). It doesn't need to fo through all the segments. My question is, if the segments (.ts) are already there and the manifest, m3u8 already shows that they are there, why doesn't fast seeking work? Thanks Louis

1 1

IP camera stream video with audio
by Gabor Alsecz 23 May '17

23 May '17

Dear All, I have 2 types of IP cameras (Bosch Dinion UHD, Samsung PNO9080) and both capable of audio streaming alongside with video when attach MIC to it. On it's own web server showing audio has input signal so should work theoretically. I can grab video but not audio? What should i do here? I opened stream - of Bosch - with ffplay like this: ffplay rtsp://192.168.1.105/rtsp_tunnel Console output: C:\Users\admin>ffplay rtsp://192.168.1.105/rtsp_tunnel ffplay version N-83585-ga5c1c7a Copyright (c) 2003-2017 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth -- enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug - -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable -libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib libavutil 55. 47.100 / 55. 47.100 libavcodec 57. 80.101 / 57. 80.101 libavformat 57. 66.102 / 57. 66.102 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 73.100 / 6. 73.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 [udp @ 0000000001ce9260] 'circular_buffer_size' option was set but it is not sup ported on this build (pthread support is required) [udp @ 0000000001cf94e0] 'circular_buffer_size' option was set but it is not sup ported on this build (pthread support is required) Input #0, rtsp, from 'rtsp://192.168.1.105/rtsp_tunnel': 0B f=0/0 Metadata: title : LIVE VIEW Duration: N/A, start: 0.040000, bitrate: N/A Stream #0:0: Video: h264 (Main), yuv420p(tv, bt470bg/bt709/bt709, progressiv e), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 180k tbc 26.75 M-V: 0.015 fd= 8 aq= 0KB vq= 792KB sq= 0B f=0/0 So visible no audio stream at all and i have no clue how can i get it. Thanks! BR, Gabor

2 1

upscaling a single DASH segment
by Qian Li 23 May '17

23 May '17

Hello, I am a newbie of FFmpeg. I am trying to upscale a single video segment (downloaded by a DASH client from a DASH server) to a higher resolution. I tried the copy and scale filters, but both of them gave the following errors: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55f1d6eeb8e0] could not find corresponding track id 1 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55f1d6eeb8e0] could not find corresponding trex [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55f1d6eeb8e0] error reading header BigBuckBunny_4s1.m4s: Invalid data found when processing input The following is the meta data of BigBuckBunny_4s1.m4s generated by mp4dump ?[styp] size=8+16 [sidx] size=12+32 reference_ID = 1 timescale = 96 earliest_presentation_time = 0 first_offset = 0 [moof] size=8+464 [mfhd] size=12+4 sequence number = 1 [traf] size=8+440 [tfhd] size=12+4, flags=20000 track ID = 1 [tfdt] size=12+4 base media decode time = 0 [trun] size=12+396, flags=205 sample count = 96 data offset = 480 first sample flags = 0 [mdat] size=8+21112 The following is the meta data of the init.mp4 file [ftyp] size=8+20 major_brand = iso5 minor_version = 1 compatible_brand = avc1 compatible_brand = dash compatible_brand = iso5 [free] size=8+50 [moov] size=8+783 ... Could you give me a hint on what is wrong and how to upscale a single DASH segment? Thanks in advance! Best regards, Qian

2 3

mapping formats to file extensions and MIME types
by Ofer Nave 21 May '17

21 May '17

I tried posting this to StackOverflow, but haven't gotten any responses yet: http://stackoverflow.com/questions/44035411/how-to-map-ffmpeg-formats-to-mi… I'll copy the question here for convenience: Anyone know of a reference for mapping ffmpeg format values to MIME types and recommended file extension? My google attempt failed to turn up anything. I did manually put together a small list with guess-work and clues from Wikipedia, IANA <https://www.iana.org/assignments/media-types/media-types.xhtml#video>, and the Mozilla Developer Network <https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types…> for the subset of formats that I encountered in my video input test collection: ffmpeg Format Extension MIME Type ─────────────────────── ───────── ────────────────────── asf asf application/vnd.ms-asf avi avi video/x-msvideo flv flv video/x-flv matroska,webm webm video/webm m4v m4v video/x-m4v mov,mp4,m4a,3gp,3g2,mj2 mp4 video/mp4 mpeg mpeg video/mpeg mpegts mpeg video/mpeg mpegvideo mpeg video/mpeg ogg ogv video/ogg matroska mkv video/x-matroska webm webm video/webm No idea if I've made the right calls, though. (The test files already have file extensions, but I'm operating on the assumption that the extension of a file a user uploads is irrelevant, and that the file should be renamed based on ffprobe and intelligent mapping...) -ofer

2 6

specific program mpd for live streaming
by negin tebyani 21 May '17

21 May '17

I am trying to dash my live video streaming and also saving them to be able to watch them later on my website. it is working for 1 hour timeshift. but i need to make mpd for a specific program, not limited by hour. and to separate my programs, make a list and have an mpd for each. for example each football game must have one mpd. how can I do this?

1 0

Is it possible to use ffmpeg as a rtmp downloader like rtmpdump?
by Xu Pu Ti 20 May '17

20 May '17

A simple 'ffmpeg -i rtmp://url -c copy -f flv -' is not expected, since ffmpeg cares too much about the actual content of the stream and will complain about bad flv tags and ignore tags it doesn't understand. Is it possible to make ffmpeg just download from rtmp and save it as a flv file and do not inspect what it contains?

4 3