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"Video won't play" turned out to be four different bugs

Our app ships long video lessons. Twenty to forty minutes each, watched mostly on hostel wifi and mobile data with two bars. Streaming video looks like a solved problem when you build the happy path. You wire up ExoPlayer, point it at a stream, it plays. Then real students open it on devices you have never held, and your bug tracker starts filling up with one line: "video not playing." That line turned out to be four unrelated problems. Here's what I actually learned. ## Buffering is the bug you feel before you see an error Nobody waits out a bad connection during a 35-minute lecture. On a 15-second reel a stall is annoying. In a lecture, a stall every two minutes means the student closes the app and studies from a PDF instead. So the real question was never "does it play." It was "what happens when the network stops cooperating for four seconds." Three situations broke us repeatedly: Wifi to mobile data handover mid-lesson Bandwidth that is technically connected but useless Short total drops, three to ten seconds, that should not end playback ExoPlayer gives you everything you need here. Adaptive bitrate, a configurable LoadControl , player listeners. The catch is that the defaults are tuned for general media, not for a 40-minute lecture on a bad link. What moved the numbers for us: Bigger buffers, deliberately. DefaultLoadControl.Builder().setBufferDurationsMs(...) takes a min buffer, a max buffer, the buffer needed to start playback, and the buffer needed to resume after a rebuffer. That last parameter is the interesting one. Raising it costs you a little extra time on resume and buys you far fewer repeat stalls, because the player stops trying to restart on a nearly empty buffer. Telling the user the truth. Our first version showed a spinner and nothing else. A spinner with no context reads as "the app is frozen," so students force-closed and reopened, which threw away the buffer and made everything worse. Saying "reconnecting" instead of spinning silently cut t

2026-09-05 原文 →
AI 资讯

How I Grew Buildside to 130 Users in 2 Weeks by Building in Public

Two weeks after launching Buildside, 130 people had joined. I did not have an ad budget or a huge email list. There was no secret growth trick. I grew Buildside by sharing the journey on X and LinkedIn, speaking with users, and letting their feedback guide the app. The biggest lesson I learned was: You have to market your product long before you launch it. I started marketing before the app was ready Many founders wait until their product feels finished before they talk about it. Sharing early work can feel risky. You may worry that people will judge it, copy it, or ignore it. I chose to share anyway. Before Buildside launched, I posted about the problem I wanted to solve, why I cared about it, and what I was learning. I showed small bits of progress and asked people what they thought. That gave people a reason to follow the journey. On launch day, I was not asking strangers to care about a new app. I was inviting people who had already watched the idea grow. Y Combinator tells founders to release early. Its guide says waiting too long is often driven by fear and the wish to make everything perfect. An early version lets you ask, “What do you think?” That advice matched my experience . I shared the fails as well as the wins It is easy to post a new user count or a kind comment. It is harder to share what went wrong. Yet the honest posts often led to the best talks. When something failed, I said so. When I changed my mind, I explained why. I shared the good days too. The goal was not to make every post look impressive. It was to show the real work. Honesty builds trust. Buffer has shared parts of its business in public for years, through both strong and hard moments. The company says being open builds trust and keeps it accountable. Its open company page shows this in action . People do not need a founder to look perfect. They want to know there is a real person listening and trying to make something useful. I let users shape Buildside Building in public was not only

2026-09-03 原文 →
AI 资讯

Instagram cracks down on AI accounts pretending to be human

Instagram is finally taking steps to address the rise of fake AI-influencer accounts that have gotten harder to spot. It's also renaming the "AI creator" label to "AI-generated profile" to make it clear when a profile features an AI-generated person that's not a real human being. "We've heard that people don't like seeing a profile […]

2026-08-31 原文 →