Re: [FFmpeg-user] Streaming quality
Am Sa., 27. Juni 2020 um 17:08 Uhr schrieb Simon Roberts : > > On Sat, Jun 27, 2020 at 1:46 AM Carl Eugen Hoyos wrote: > > > > Am 27.06.2020 um 05:26 schrieb Simon Roberts < > > si...@dancingcloudservices.com>: > > > > > > ffmpeg -i -f mpegts tcp://192.168.1.109:2000 > > > > Either specify a constant quantiser with “-qscale 10 -mbd 2” or a constant > > bitrate with “-b:v 1000k” or use “-vcodec libx264” for an encoder with a > > better default or “-vcodec copy” to avoid re-encoding. > > > > > Many thanks Carl that fixed it. > > I guess the inference that I had missed is that there's some kind of > default encoding going on here--it's not just a network pipe. Yes, this would make no sense. > Is that a general case for ffmpeg, or is it specific to streaming Every format has a default encoder... > or perhaps this streaming mode? > (and, far less important since I doubt I'll ever want to > use it, is the encoding predictable, or does it vary by build?) ... which in some cases depends on compilation options. 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] Streaming quality
On Sat, Jun 27, 2020 at 1:46 AM Carl Eugen Hoyos wrote: > > Am 27.06.2020 um 05:26 schrieb Simon Roberts < > si...@dancingcloudservices.com>: > > > > ffmpeg -i -f mpegts tcp://192.168.1.109:2000 > > Either specify a constant quantiser with “-qscale 10 -mbd 2” or a constant > bitrate with “-b:v 1000k” or use “-vcodec libx264” for an encoder with a > better default or “-vcodec copy” to avoid re-encoding. > > Many thanks Carl that fixed it. I guess the inference that I had missed is that there's some kind of default encoding going on here--it's not just a network pipe. Is that a general case for ffmpeg, or is it specific to streaming, or perhaps this streaming mode? (and, far less important since I doubt I'll ever want to use it, is the encoding predictable, or does it vary by build?) 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". -- Simon Roberts (303) 249 3613 ___ 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] Streaming quality
> Am 27.06.2020 um 05:26 schrieb Simon Roberts : > > ffmpeg -i -f mpegts tcp://192.168.1.109:2000 Either specify a constant quantiser with “-qscale 10 -mbd 2” or a constant bitrate with “-b:v 1000k” or use “-vcodec libx264” for an encoder with a better default or “-vcodec copy” to avoid re-encoding. 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".
[FFmpeg-user] Streaming quality
Greetings all, I'm making my first experiments with streaming. Currently I do a live capture of a screen region compress in real time and save the file. What I want to do is to take that capture and send it to another machine for storage where it will be embedded in a multi-stream container with other sources. So far in my experiments, I have a file I captured earlier and I'm streaming that over to the remote system and using ffplay to view it, rather than store it. What I find is that the quality is trashed in the transmission, and I don't know where to start looking for why. The original file is 720p screen capture, and it's crisp and sharp. At the receiver, it shows what I might describe as heavy "jpeg artifacts", that is, fuzzyness and penumbra around all the edges of things like windows and text. The commands I'm using are: Receiver: ffplay -i tcp://192.168.1.109:2000?listen Transmitter: ffmpeg -i -f mpegts tcp://192.168.1.109:2000 Since no codecs are mentioned, I rather assumed that the file would be streamed "as is", but that's clearly not the case. Can anyone point me at what I need to know to make the transmission process not alter the quality of the image? Many thanks, Simon -- Simon Roberts (303) 249 3613 ___ 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".
